Review of recent advances in bone scaffold fabrication methods for tissue engineering for treating bone diseases and sport injuries.

Despite advancements in medical care, the management of bone injuries remains one of the most significant challenges in the fields of medicine and sports medicine globally. Bone tissue damage is often associated with aging, reduced quality of life, and various conditions such as trauma, cancer, and infection. While bone tissue possesses the natural capacity for self-repair and regeneration, severe damage may render conventional treatments ineffective, and bone grafting may be limited due to secondary surgical procedures and potential disease transmission. In such cases, bone tissue engineering has emerged as a viable approach, utilizing cells, scaffolds, and growth factors to repair damaged bone tissue. This research shows a comprehensive review of the current literature on the most important and effective methods and materials for improving the treatment of these injuries. Commonly employed cell types include osteogenic cells, embryonic stem cells, and mesenchymal cells, while scaffolds play a crucial role in bone tissue regeneration. To create an effective bone scaffold, a thorough understanding of bone structure, material selection, and examination of scaffold fabrication techniques from inception to the present day is necessary. By gaining insights into these three key components, the ability to design and construct appropriate bone scaffolds can be achieved. Bone tissue engineering scaffolds are evaluated based on factors such as strength, porosity, cell adhesion, biocompatibility, and biodegradability. This article examines the diverse categories of bone scaffolds, the materials and techniques used in their fabrication, as well as the associated merits and drawbacks of these approaches. Furthermore, the review explores the utilization of various scaffold types in bone tissue engineering applications.

Fibulin-2: A potential regulator of immune dysfunction after bone trauma.

OBJECTIVES: To reveal the relationship between the fibulin-2 protein and immune dysfunction after bone trauma. METHODS: Individuals who were admitted to the study were divided into a bone trauma group, a recovered from bone trauma group and a volunteer without bone trauma group based on the reason for admission. Fibulin-2 levels in the three groups were compared. Fibulin-2-knockout (fibulin-2-/- ) mice and wild-type (WT) mice were used to detect susceptibility to infection. Hematoxylin and eosin (HE) staining and immunohistochemical staining were employed to observe pathological changes in each organ from fibulin-2-/- mice and WT mice. RESULTS: In total, 132 patients were enrolled in this study. The fibulin-2 level in the bone trauma group was lower than that in the recovered bone trauma group (3.39 ± 1.41 vs. 4.30 ± 1.38 ng/mL, t = 2.948, p < .05) and also lower than that in the volunteers without bone trauma group (3.39 ± 1.41 vs. 4.73 ± 1.67 ng/mL, t = 4.135, p < .05). Fibulin-2-/- mice are more prone to infection. Compared with those in WT mice, spleen function and thymus function in fibulin-2-/- mice were impaired. Immunohistochemical staining revealed that compared with those in WT mice, significantly fewer CD4+ T cells, CD8+ T cells, and CD19+ B cells were noted in the spleen and thymus of fibulin-2-/- mice. CONCLUSIONS: The plasma fibulin-2 level was lower in patients with bone trauma. Decreased fibulin-2 is associated with immune dysfunction after bone trauma.

Microtomographic, histomorphometric, and molecular features show a normal alveolar bone healing process in iNOS-deficient mice along a compensatory upregulation of eNOS and nNOS isoforms.

METHODOLOGY: Inducible nitric oxide synthase (iNOS) is one of the enzymes responsible for the synthesis of nitric oxide (NO), which is an important signaling molecule with effects on blood vessels, leukocytes, and bone cells. However, the role of iNOS in alveolar bone healing remains unclear. This study investigated the role of iNOS in alveolar bone healing after tooth extraction in mice. C57Bl/6 wild type (WT) and iNOS genetically deficient (iNOS-KO) mice were subjected to upper incision tooth extraction, and alveolar bone healing was evaluated by micro-computed tomography (µCT) and histological/histomorphometric, birefringence, and molecular methods. RESULTS: The expression of iNOS had very low control conditions, whereas a significant increase is observed in healing sites of WT mice, where iNOS mRNA levels peak at 7d time point, followed by a relative decrease at 14d and 21d. Regarding bone healing, both WT and iNOS-KO groups showed the usual phases characterized by the presence of clots, granulation tissue development along the inflammatory cell infiltration, angiogenesis, proliferation of fibroblasts and extracellular matrix synthesis, bone neoformation, and remodeling. The overall micro-computed tomography and histomorphometric and birefringence analyses showed similar bone healing readouts when WT and iNOS-KO strains are compared. Likewise, Real-Time PCR array analysis shows an overall similar gene expression pattern (including bone formation, bone resorption, and inflammatory and immunological markers) in healing sites of WT and iNOS-KO mice. Moreover, molecular analysis shows that nNOS and eNOS were significantly upregulated in the iNOS-KO group, suggesting that other NOS isoforms could compensate the absence of iNOS. CONCLUSION: The absence of iNOS does not result in a significant modulation of bone healing readouts in iNOS-KO mice. The upregulation of nNOS and eNOS may compensate iNOS absence, explaining the similar bone healing outcome in WT and iNOS-KO strains.

[How I treat... a fracture of the coronoid apophysis, choice between conservative attitude and surgical treatment]. / Comment je traite...une fracture de l'apophyse coronoïde, entre attitude conservatrice et traitement chirurgical.

Fractures of the coronoid process are the rarest mandibular fractures and are mostly associated with other maxillofacial fractures. They are most often encountered in trauma. The CT-scanner is the gold standard for locating and characterizing this lesion. Although the diagnosis is made radiologically, clinical examination may reveal various symptoms specific to this fracture, which may appear frustrated when other facial fractures are associated. In most cases, conservative treatment by intermaxillary fixation is preferred. However, in specific cases, surgical intervention such as coronoidectomy or open reduction with osteosynthesis is indicated. The type of fracture, its location, the delay before its management, the clinic and the presence of associated fractures guide the therapeutic attitude. Surgical management must be followed by early and intensive physiotherapy to avoid zygomatico-coronoid ankylosis, the main complication of this fracture.

Les fractures de l'apophyse coronoïde sont les fractures mandibulaires les plus rares et majoritairement associées à d'autres fractures maxillo-faciales. Elles se rencontrent le plus souvent lors de traumatisme. Le CT-scanner est le gold standard pour localiser et caractériser cette lésion. Bien que le diagnostic soit radiologique, l'examen clinique peut révéler différents symptômes propres à cette fracture et qui peuvent paraître frustres lorsque d'autres fractures du massif facial y sont associées. Dans la majorité des cas, le traitement conservateur par fixation intermaxillaire est privilégié. Mais dans des indications précises, une intervention chirurgicale, comme une coronoïdectomie ou une réduction ouverte avec ostéosynthèse, est indiquée. Le type de fracture, sa localisation, le délai avant sa prise en charge, la clinique et la présence de fractures associées guident l'attitude thérapeutique. Une prise en charge chirurgicale doit être suivie de physiothérapie précoce et intensive pour éviter l'ankylose zygomatico-coronoïde, principale complication de cette fracture.

Langerhans cell histiocytosis in the mandibular condyle and ramus. Endoscopic diagnosis. Case report / Histiocitosis de células de Langerhans en cóndilo y rama mandibular. Diagnóstico por vía endoscópica. Reporte de un caso

Langerhans cell histiocytosis (LCH) is a rare disease caused by uncontrolled proliferation and accumulation of immature bone marrow-derived myeloid dendritic cells. It is common in the pediatric population under 15 years of age and usually affects bones such as the skull, femur and mandibular body. This study presents the case of a 6-year-old female patient, with a bone lesion in the right mandibular ramus and condyle at an unusual location. A sample of the pathological tissue was taken by intraoral endoscopy to avoid comorbidities and esthetic sequelae. After a joint medical evaluation, the lesion was diagnosed as a monofocal LCH with special site involvement, establishing a single systemic treatment with indomethacin, as opposed to the chemotherapy regimen recommended by the International Histiocyte Society, in order to reduce the adverse effects of the latter. Two months after the beginning of the pharmacological treatment, reosification of the affected area was observed, with no recurrences after the end of the treatment. (AU)

La histiocitosis de células de Langerhans (LCH) es una afección rara originada por proliferación y acumulación descontrolada de células dendríticas mieloides inmaduras derivadas de la médula ósea. Su presentación es común en población pediátrica menor a 15 años, y suele afectar a huesos como el cráneo, fémur y cuerpo mandibular.En esta publicación se presenta el caso de un paciente de género femenino de 6 años, con lesión ósea en rama y cóndilo mandibular derecho de localización poco frecuente. Destaca la toma de muestra del tejido patológico mediante vía endoscópica intraoral con el fin de evitar comorbilidades y secuelas estéticas. Después de una evaluación médica conjunta, se diagnosticó como LCH monofocal con compromiso de sitio especial, estableciendo un tratamiento único de forma sistémica con indometacina, diferente a la quimioterapia recomendada por la Sociedad Internacional de Histiocitosis, de tal forma que disminuya los efectos adversos de esta. Se observó a los 2 meses de iniciado el tratamiento farmacológico reosificación de la zona afectada y sin recidivas posterior al término de este. (AU)

Single-cell mapping of regenerative and fibrotic healing responses after musculoskeletal injury.

After injury, a cascade of events repairs the damaged tissue, including expansion and differentiation of the progenitor pool and redeposition of matrix. To guide future wound regeneration strategies, we compared single-cell sequencing of regenerative (third phalangeal element [P3]) and fibrotic (second phalangeal element [P2]) digit tip amputation (DTA) models as well as traumatic heterotopic ossification (HO; aberrant). Analyses point to a common initial response to injury, including expansion of progenitors, redeposition of matrix, and activation of transforming growth factor ß (TGF-ß) and WNT pathways. Surprisingly, fibrotic P2 DTA showed greater transcriptional similarity to HO than to regenerative P3 DTA, suggesting that gene expression more strongly correlates with healing outcome than with injury type or cell origin. Differential analysis and immunostaining revealed altered activation of inflammatory pathways, such as the complement pathway, in the progenitor cells. These data suggests that common pathways are activated in response to damage but are fine tuned within each injury. Modulating these pathways may shift the balance toward regenerative outcomes.

Oligometástasis en la cirugía ortopédica oncológica. Nuestra experiencia / Oligometastases in oncological orthopedic surgery. Our experience

Objetivo: Analizar la incidencia, factores pronósticos, indicación de tratamiento quirúrgico y supervivencia de los pacientes con criterios de oligometástasis óseas con los criterios de solitaria y normal ósea tratados en centros expertos en la resección tumoral de lesiones óseas. Material y método: Análisis retrospectivo de 414 pacientes afectos de metástasis óseas secundarias a carcinomas del Hospital Universitario La Paz y Hospital MD Anderson Cancer Center (Madrid), entre mayo de 2006 y mayo de 2019. Fueron excluidos las metástasis localizadas en pelvis y esqueleto axial, analizándose un total de 28 pacientes que cumplían con el criterio de metástasis solitaria u oligometástasis con criterio normal. La estimación de la supervivencia del estudio se llevó a cabo siguiendo el método estadístico de Kaplan-Meier. Resultados: La supervivencia de los pacientes siguiendo los criterios de oligometástasis (solitaria y normal) fue del 53%. El cáncer de mama fue el más prevalente y presentó una supervivencia superior al 70%. La edad promedio de los pacientes fue de 58 años. Discusión: Los tratamientos sistémicos en el tratamiento del cáncer han conseguido mejorar las curvas de supervivencia libre de enfermedad y nos lleva a reflexionar sobre el paradigma del tratamiento de las oligometástasis, planteando que el tratamiento debería realizarse en centros expertos en la resección tumoral de lesiones óseas. Conclusiones: La elección del tratamiento quirúrgico de los pacientes afectos de oligometástasis en sentido estricto (solitaria) y normal deben ser evaluada por equipos multidisciplinarios, según el pronóstico del paciente, localización anatómica e histiotipo de la neoplasia. Nivel de evidencia 3.(AU)

Objective: To analyze the incidence and survival of patients with oligometastases (solitary and normal) when they are treated in centers that are experts in multidisciplinary approach to patients with sarcoma. Material and method: Retrospective analysis of 414 patients with bone metastases secondary to carcinomas at Hospital Universitario La Paz and Hospital MD Anderson Cancer Center (Madrid) between May 2006 and May 2019. Metastases located in the pelvis and axial skeleton were excluded, analyzing a total of 28 patients who met the criterion for solitary metastases or oligometastases with normal criteria. The study survival estimate was carried out following the Kaplan–Meier statistical method. Results: The survival of the patients following the oligometastases criteria (solitary and normal) was 53%. Breast cancer was the most prevalent and had a survival rate of more than 70%. The average age of the patients was 58 years old. Discussion: Systemic treatments in cancer treatment have managed to improve disease-free survival curves and lead us to redirect on the paradigm for the treatment of oligometastases, stating that treatment should be carried out in the centers that are experts in the treatment of sarcomas. Conclusions: The choice of surgical treatment for patients with oligometastases in the strict sense (solitary) and normal should be evaluated by multidisciplinary teams according to the prognoses of the patient, anatomical location and histiotype of the neoplasm. Level of evidence 3.(AU)

[Translated article] Oligometastases in oncological orthopaedic surgery. Our experience / Oligometástasis en la cirugía ortopédica oncológica. Nuestra experiencia

Objetivo: Analizar la incidencia, factores pronósticos, indicación de tratamiento quirúrgico y supervivencia de los pacientes con criterios de oligometástasis óseas con los criterios de solitaria y normal ósea tratados en centros expertos en la resección tumoral de lesiones óseas. Material y método: Análisis retrospectivo de 414 pacientes afectos de metástasis óseas secundarias a carcinomas del Hospital Universitario La Paz y Hospital MD Anderson Cancer Center (Madrid), entre mayo de 2006 y mayo de 2019. Fueron excluidos las metástasis localizadas en pelvis y esqueleto axial, analizándose un total de 28 pacientes que cumplían con el criterio de metástasis solitaria u oligometástasis con criterio normal. La estimación de la supervivencia del estudio se llevó a cabo siguiendo el método estadístico de Kaplan-Meier. Resultados: La supervivencia de los pacientes siguiendo los criterios de oligometástasis (solitaria y normal) fue del 53%. El cáncer de mama fue el más prevalente y presentó una supervivencia superior al 70%. La edad promedio de los pacientes fue de 58 años. Discusión: Los tratamientos sistémicos en el tratamiento del cáncer han conseguido mejorar las curvas de supervivencia libre de enfermedad y nos lleva a reflexionar sobre el paradigma del tratamiento de las oligometástasis, planteando que el tratamiento debería realizarse en centros expertos en la resección tumoral de lesiones óseas. Conclusiones: La elección del tratamiento quirúrgico de los pacientes afectos de oligometástasis en sentido estricto (solitaria) y normal deben ser evaluada por equipos multidisciplinarios, según el pronóstico del paciente, localización anatómica e histiotipo de la neoplasia. Nivel de evidencia 3.(AU)

Objective: To analyze the incidence and survival of patients with oligometastases (solitary and normal) when they are treated in centers that are experts in multidisciplinary approach to patients with sarcoma. Material and method: Retrospective analysis of 414 patients with bone metastases secondary to carcinomas at Hospital Universitario La Paz and Hospital MD Anderson Cancer Center (Madrid) between May 2006 and May 2019. Metastases located in the pelvis and axial skeleton were excluded, analyzing a total of 28 patients who met the criterion for solitary metastases or oligometastases with normal criteria. The study survival estimate was carried out following the Kaplan–Meier statistical method. Results: The survival of the patients following the oligometastases criteria (solitary and normal) was 53%. Breast cancer was the most prevalent and had a survival rate of more than 70%. The average age of the patients was 58 years old. Discussion: Systemic treatments in cancer treatment have managed to improve disease-free survival curves and lead us to redirect on the paradigm for the treatment of oligometastases, stating that treatment should be carried out in the centers that are experts in the treatment of sarcomas. Conclusions: The choice of surgical treatment for patients with oligometastases in the strict sense (solitary) and normal should be evaluated by multidisciplinary teams according to the prognoses of the patient, anatomical location and histiotype of the neoplasm. Level of evidence 3.(AU)

Risk Factors to Persistent Pain Following Musculoskeletal Injuries: A Systematic Literature Review.

BACKGROUND: Musculoskeletal (MSK) injury is one of the major causes of persistent pain. OBJECTIVE: This systematic literature review explored the factors that lead to persistent pain following a MSK injury in the general population, including athletes. METHODS: A primary literature search of five electronic databases was performed to identify cohort, prospective, and longitudinal trials. Studies of adults who diagnosed with a MSK injury, such as sprains, strains or trauma, were included. RESULTS: Eighteen studies involving 5372 participants were included in this review. Participants' ages ranged from 18-95 years. Most of the included studies were of prospective longitudinal design. Participants had a variety of MSK injuries (traumatic and non-traumatic) causing persistent pain. Multiple factors were identified as influencing the development of persistent pain following a MSK injury, including high pain intensity at baseline, post-traumatic stress syndrome, presence of medical comorbidities, and fear of movement. Scarcity of existing literature and the heterogeneity of the studies made meta-analysis not possible. CONCLUSIONS: This systematic review highlighted factors that might help predict persistent pain and disability following MSK injury in the general population, including athletes. Identification of these factors may help clinicians and other health care providers prevent the development of persistent pain following a MSK injury.

Procesamiento de muestras osteoarticulares para diagnóstico microbiológico: resultados de una encuesta multicéntrica nacional / Processing of osteoarticular samples for microbiological diagnosis: Results of a national multi-center survey

Introducción: Nuestro objetivo fue evaluar la variabilidad en el procesamiento de muestras osteoarticulares para el diagnóstico microbiológico entre distintos centros nacionales. Métodos: Se diseñó una encuesta online con 13 preguntas y se difundió a través de la SEIMC a los servicios de microbiología de los distintos centros. Resultados: Obtuvimos 72 respuestas. En más de la mitad de los centros, de tercer nivel, se reciben al menos 5 muestras. Aproximadamente la mitad de los centros agitan con vórtex las muestras de hueso/implante, utilizándose la sonicación sobre todo en centros de tercer nivel. Se realizan cultivos para bacterias aerobias y anaerobias durante 6-10 días de incubación, pero con diferencias en los medios de cultivo líquidos. El diagnóstico molecular se realiza en menos del 50% de los centros, siendo la PCR universal (ARNr 16S) la técnica más empleada. Conclusiones: Existe heterogeneidad fundamentalmente en el empleo de sonicación, los medios líquidos de cultivo o el diagnóstico molecular, probablemente en relación directa con los recursos y capacidades de cada centro.(AU)

Introduction. Our aim was to evaluate the variability in the processing of osteoarticular samples for microbiological diagnosis between different national centers. Methods: An online survey with 13 questions was designed and it was sent through SEIMC to the Microbiology Departments of the different centers. Results: We obtained 72 answers. In more than half of the tertiary-care centers, at least 5 samples are received. Approximately half of the centers vortex bones/implant samples. Sonication is used mostly in tertiary-care centers. Cultures for aerobic and anaerobic bacteria are performed during 6-10 days of incubation but with differences in liquid culture media. Molecular diagnosis is performed in less than 50% of the centers. Universal PCR (16S rRNA) is the most widely used technique. Conclusion: We found heterogeneity especially in the use of sonication, liquid culture media or molecular diagnosis, probably in direct relation to the resources and capacities of each center.(AU)

Effects of non-Fourier bioheat transfer on bone drilling temperature in orthopedic surgery: Theoretical and in vitro experimental investigation.

The mechanical drilling process is a typical step in treating bone fractures to fix broken parts with screws and plates. Drilling generates a significant amount of heat and elevates the temperature of the bone, which can cause thermal osteonecrosis and damage to the surrounding bone tissue and nerves. Thermal inertia between heat flux and temperature gradient in nonhomogeneous interior structural medium-like biological tissues is arguable. Therefore, this paper proposes an analytical model of heat propagation in bone drilling for orthopedic surgery based on the hyperbolic Pennes bioheat transfer equation (HPBTE). Drilling experiments in bovine cortical bone samples were also carried out using an infrared thermography approach to confirm the proposed analytical model. Around the drilled hole surface, thermal necrosis is spread out from 1 to 10 mm. Increased feed rate reduces necrosis penetration distance and increases intense bone necrosis. The HPBTE includes thermal relaxation time effect and internal convective function of tissue perfusion rate. As these factors are not considered in the parabolic heat transfer equation (PHTE), the results show that the HPBTE is more accurate in predicting temperature and thermal osteonecrosis than the PHTE. As a result, proposed analytical model is a handy tool for calculating temperature to avoid thermal damage while improving process efficiency. Furthermore, it has the capability of controlling the manual or robotic drilling procedure for minimally invasive operations.

Exosomes from adipose-derived stem cells regulate M1/M2 macrophage phenotypic polarization to promote bone healing via miR-451a/MIF.

OBJECTIVES: Bone defects caused by diseases and trauma are usually accompanied by inflammation, and the implantation of biomaterials as a common repair method has also been found to cause inflammatory reactions, which affect bone metabolism and new bone formation. This study investigated whether exosomes from adipose-derived stem cells (ADSC-Exos) plays an immunomodulatory role in traumatic bone defects and elucidated the underlying mechanisms. METHODS: ADSC-Exos were loaded by a biomaterial named gelatine nanoparticles (GNPs), physical and chemical properties were analysed by zeta potential, surface topography and rheology. A rat model of skull defect was used for our in vivo studies, and micro-CT and histological staining were used to analyse histological changes in the bone defect area. RT-qPCR and western blotting were performed to verify that ADSC-Exos could regulate M1/M2 macrophage polarization. MicroRNA (miRNA) array analysis was conducted to determine the miRNA expression profiles of ADSC-Exos. After macrophages were treated with a miR-451a mimic, miR-451a inhibitor and ISO-1, the relative expression of genes and proteins was measured by RT-qPCR and western blotting. RESULTS: In vivo, micro-CT and histological staining showed that exosome-loaded GNPs (GNP-Exos) hydrogel, with good biocompatibility and strong mechanical adaptability, exhibited immunomodulatory effect mainly by regulating macrophage immunity and promoting bone tissue healing. Immunofluorescence further indicated that ADSC-Exos reduced M1 marker (iNOS) expression and increased M2 marker (CD206) expression. Moreover, in vitro studies, western blotting and RT-qPCR showed that ADSC-Exos inhibited M1 macrophage marker expression and upregulated M2 macrophage marker expression. MiR-451a was enriched in ADSC-Exos and targeted macrophage migration inhibitory factor (MIF). Macrophages treated with the miR-451a mimic showed lower expression of M1 markers. In contrast, miR-451a inhibitor treatment upregulated the expression of M1 markers and downregulated the expression of M2 markers, while ISO-1 (a MIF inhibitor) treatment upregulated miR-451a expression and downregulated M1 macrophage marker expression. CONCLUSION: GNP-Exos can effectively regulate bone immune metabolism and further promote bone healing partly through immune regulation of miR-451a, which may provide a therapeutic direction for bone repair.

Fracturas del cóndilo lateral del húmero asociadas a luxación de codo en niños. Una revisión sistemática de la literatura / Fractures of the lateral condyle of the humerus associated with elbow dislocation in children. A systematic review of the literature

Introducción: Las fracturas de cóndilo humeral lateral (FCHL) representan del 12 al 17% de las fracturas de codo pediátrico. La asociación de esta fractura con luxación de codo es poco común, siendo escasa la bibliografía y generalmente limitada a reportes de casos. Nuestro objetivo fue revisar sistemáticamente la literatura sobre las fracturas del cóndilo lateral del húmero asociadas a luxación de codo en niños. Métodos: Se realizó una revisión sistemática mediante una búsqueda exhaustiva en las bases de datos PubMed y Embase de literatura revisada por pares entre 1960 y 2020. Dos revisores filtraron los resultados y buscaron artículos en inglés o español que reportan pacientes esqueléticamente inmaduros con fracturas del cóndilo lateral del húmero asociadas a luxación de codo. Los resultados analizados incluyeron características del paciente y de la lesión, estrategias de tratamiento, complicaciones y resultados finales. Resultados: La búsqueda inicial arrojó un total de 851 estudios. Después de la revisión, se incluyeron 16 estudios, con 67 pacientes disponibles para revisión. Las edades reportadas al momento de la lesión variaron entre 2 y 12 años. La lesión se presentó más comúnmente en varones con fracturas tipo Milch II, Jakob tipo 3. La dirección de la luxación fue posteromedial en la mayoría de los casos. La reducción abierta por abordaje lateral y la colocación de clavijas Kirschner fue el tratamiento más comúnmente realizado. El seguimiento reportado se presentó en un rango 3 a 156 meses. Catorce estudios informaron complicaciones en un tercio de los pacientes, que incluyen: limitación del rango de movimiento, cúbito varo, inestabilidad, prominencia del implante, retraso de la consolidación, seudoartrosis, consolidación viciosa, osificación heterotópica, lesión neurológica y fallo del implante. Trece estudios informaron resultados clínicos, que se calificaron como regulares o pobres en 2de cada 10pacientes.(AU)

Background: Lateral humeral condyle fractures are the second most common fracture around the elbow in children. However, the association of an elbow dislocation is a rare entity. Therefore, literature on young patients with this uncommon combination is sparse. We aimed to perform a systematic review of the literature searching for pediatric lateral condyle humerus fractures associated to elbow dislocation. Methods: A systematic review of the PubMed and Embase databases was conducted for peer-reviewed literature between 1960 and 2020. Two reviewers filtered the results, looking for articles in English and Spanish that reported fractures of the lateral condyle of the humerus associated to elbow dislocation in skeletally immature patients. Outcomes included patient and injury characteristics, treatment strategies, complications, and final outcomes including range of motion. Results: The initial search yielded a total of 851 studies. After initial screening, 16 studies were included, with 67 patients available for review. Age reported at the time of injury ranged from 2 to 12 years. The lesion occurred more commonly in males (60%) with Milch II, and Jakob type 3 fractures. The direction of the dislocation was posteromedial in most cases. Open reduction by lateral approach and Kirschner pin placement was the most performed treatment. The reported follow-up ranged from 3 to 156 months. Fourteen studies reported complications in 1/3 of the patients including: limited range of motion, cubitus varus, instability, hardware prominence, delayed union, nonunion, malunion, heterotopic ossification, neurological injury, and hardware failure. Thirteen studies reported clinical outcomes, which were rated as fair or poor in 2out of 10patients.(AU)

Fractures of the lateral condyle of the humerus associated with elbow dislocation in children. A systematic review of the literature / Fracturas del cóndilo lateral del húmero asociadas a luxación de codo en niños. Una revisión sistemática de la literatura

Background: Lateral humeral condyle fractures are the second most common fracture around the elbow in children. However, the association of an elbow dislocation is a rare entity. Therefore, literature on young patients with this uncommon combination is sparse. We aimed to perform a systematic review of the literature searching for pediatric lateral condyle humerus fractures associated to elbow dislocation. Methods: A systematic review of the PubMed and Embase databases was conducted for peer-reviewed literature between 1960 and 2020. Two reviewers filtered the results, looking for articles in English and Spanish that reported fractures of the lateral condyle of the humerus associated to elbow dislocation in skeletally immature patients. Outcomes included patient and injury characteristics, treatment strategies, complications, and final outcomes including range of motion. Results: The initial search yielded a total of 851 studies. After initial screening, 16 studies were included, with 67 patients available for review. Age reported at the time of injury ranged from 2 to 12 years. The lesion occurred more commonly in males (60%) with Milch II, and Jakob type 3 fractures. The direction of the dislocation was posteromedial in most cases. Open reduction by lateral approach and Kirschner pin placement was the most performed treatment. The reported follow-up ranged from 3 to 156 months. Fourteen studies reported complications in 1/3 of the patients including: limited range of motion, cubitus varus, instability, hardware prominence, delayed union, nonunion, malunion, heterotopic ossification, neurological injury, and hardware failure. Thirteen studies reported clinical outcomes, which were rated as fair or poor in 2out of 10patients.(AU)

Introducción: Las fracturas de cóndilo humeral lateral (FCHL) representan del 12 al 17% de las fracturas de codo pediátrico. La asociación de esta fractura con luxación de codo es poco común, siendo escasa la bibliografía y generalmente limitada a reportes de casos. Nuestro objetivo fue revisar sistemáticamente la literatura sobre las fracturas del cóndilo lateral del húmero asociadas a luxación de codo en niños. Métodos: Se realizó una revisión sistemática mediante una búsqueda exhaustiva en las bases de datos PubMed y Embase de literatura revisada por pares entre 1960 y 2020. Dos revisores filtraron los resultados y buscaron artículos en inglés o español que reportan pacientes esqueléticamente inmaduros con fracturas del cóndilo lateral del húmero asociadas a luxación de codo. Los resultados analizados incluyeron características del paciente y de la lesión, estrategias de tratamiento, complicaciones y resultados finales. Resultados: La búsqueda inicial arrojó un total de 851 estudios. Después de la revisión, se incluyeron 16 estudios, con 67 pacientes disponibles para revisión. Las edades reportadas al momento de la lesión variaron entre 2 y 12 años. La lesión se presentó más comúnmente en varones con fracturas tipo Milch II, Jakob tipo 3. La dirección de la luxación fue posteromedial en la mayoría de los casos. La reducción abierta por abordaje lateral y la colocación de clavijas Kirschner fue el tratamiento más comúnmente realizado. El seguimiento reportado se presentó en un rango 3 a 156 meses. Catorce estudios informaron complicaciones en un tercio de los pacientes, que incluyen: limitación del rango de movimiento, cúbito varo, inestabilidad, prominencia del implante, retraso de la consolidación, seudoartrosis, consolidación viciosa, osificación heterotópica, lesión neurológica y fallo del implante. Trece estudios informaron resultados clínicos, que se calificaron como regulares o pobres en 2de cada 10pacientes.(AU)

Evaluation of the effects of preconditioned human stem cells plus a scaffold and photobiomodulation administration on stereological parameters and gene expression levels in a critical size bone defect in rats.

We assessed the impact of photobiomodulation (PBM) plus adipose-derived stem cells (ASCs) during the anabolic and catabolic stages of bone healing in a rat model of a critical size femoral defect (CSFD) that was filled with a decellularized bone matrix (DBM). Stereological analysis and gene expression levels of bone morphogenetic protein 4 (BMP4), Runt-related transcription factor 2 (RUNX2), and stromal cell-derived factor 1 (SDF1) were determined. There were six groups of rats. Group 1 was the untreated control or DBM. Study groups 2-6 were treated as follows: ASC (ASC transplanted into DBM, then implanted in the CSFD); PBM (CSFD treated with PBM); irradiated ASC (iASC) (ASCs preconditioned with PBM, then transplanted into DBM, and implanted in the CSFD); ASC + PBM (ASCs transplanted into DBM, then implanted in the CSFD, followed by PBM administration); and iASC + PBM (the same as iASC, except CSFDs were exposed to PBM). At the anabolic step, all treatment groups had significantly increased trabecular bone volume (TBV) (24.22%) and osteoblasts (83.2%) compared to the control group (all, p = .000). However, TBV in group iASC + PBM groups were superior to the other groups (97.48% for osteoblast and 58.8% for trabecular bone volume) (all, p = .000). The numbers of osteocytes in ASC (78.2%) and iASC + PBM (30%) groups were remarkably higher compared to group control (both, p = .000). There were significantly higher SDF (1.5-fold), RUNX2 (1.3-fold), and BMP4 (1.9-fold) mRNA levels in the iASC + PBM group compared to the control and some of the treatment groups. At the catabolic step of bone healing, TBV increased significantly in PBM (30.77%), ASC + PBM (32.27%), and iASC + PBM (35.93%) groups compared to the control group (all, p = .000). There were significantly more osteoblasts and osteocytes in ASC (71.7%, 62.02%) (p = .002, p = .000); PBM (82.54%, 156%), iASC (179%, 23%), and ASC + PBM (108%, 110%) (all, p = .000), and iASC + PBM (79%, 100.6%) (p = .001, p = .000) groups compared to control group. ASC preconditioned with PBM in vitro plus PBM in vivo significantly increased stereological parameters and SDF1, RUNX2, and BMP4 mRNA expressions during bone healing in a CSFD model in rats.

Bone pain management with opioid medication in a patient with Camurati-Engelmann disease: a case report / Manejo del dolor óseo con medicación opioide en una paciente con enfermedad de Camurati-Engelmann: reporte de un caso

Introduction: Camurati-Engelman Disease is a rare genetic sclerosing bone dysplasia with periosteal and endosteal thickening of the cortical of the long bones. It generates pain secondary to the reduction of the medullary canal that is usually controlled with corticosteroids and, in severe cases, with surgical decompression. Case history: We present the case of a woman with a genetic diagnosis of Camurati-Engelman Disease with poor pain control with corticosteroid management and surgical procedures throughout her childhood and early adulthood. In whom optimal pain control was achieved with pain regimen with hydrocodone analgesic management. This is the first case described in the literature for adequate pain control using an opioid drug. Discussion: CE disease is an extremely rare genetic entity with little more than 300 cases reported in the world. It is generated by an alteration in the gene for growth factor-beta 1 (TGF-B1); it has a varied clinical presentation that can begin with bone alterations accompanied by muscle weakness, joint angular alterations, headache, and nerve compressions. It has a differential diagnosis with some genetic entities that may present clinical similarity, but its morphological and radiological characteristics are distinctive. The usual management of bone pain generated by this entity is based on corticosteroids, in addition to losartan or surgical intervention aimed at reducing cortical changes. The intervention with opioid analgesics accompanied by a rehabilitation plan is not a frequent report, this being a case of success due to the refractoriness of the symptoms in a patient with chronic pain, with a positive impact on her functionality and quality of life. Conclusion: It is considered that analgesic management with opioids may be a treatment option in patients with Camurati-Engelman disease refractory to corticosteroid management and surgical interventions.(AU)

Introducción: La enfermedad de Camurati-Engelman (CE) es una displasia ósea esclerosante rara, de causa genética. Se presenta con engrosamiento perióstico y endóstico de la cortical de los huesos largos. Genera dolor secundario a la reducción del canal medular, que habitualmente se controla con corticoides y en casos severos, con descompresión quirúrgica. Historia del caso: Presentamos el caso de una mujer con diagnóstico genético de enfermedad de Camurati-Engelman, con mal control del dolor, con manejo de corticosteroides y procedimientos quirúrgicos a lo largo de su niñez y adultez temprana. Se logró un control óptimo del dolor con un régimen con manejo analgésico con hidrocodona. Este es el primer caso descrito en la literatura de un adecuado control del dolor con un medicamento opioide. Discusión: La enfermedad de CE es una entidad genética extremadamente rara, con poco más de 300 casos reportados en el mundo. Se genera por una alteración en el gen del factor de crecimiento beta 1 (TGF-B1). Tiene una presentación clínica variada que puede iniciar con las alteraciones óseas acompañado de debilidad muscular, alteraciones angulares articulares, cefalea y compresiones nerviosas. Tiene diagnóstico diferencial con algunas entidades genéticas que pueden presentar similitud clínica, pero su característica morfológica y radiológica es distintiva. El manejo usual del dolor óseo generado por esta entidad se basa en corticoesteroides, además de losartán o intervenciones quirúrgicas orientadas a disminuir los cambios corticales. La intervención con analgésicos opioides, acompañada de un plan de rehabilitación, no es un reporte frecuente, siendo este un caso de éxito ante la refractariedad de los síntomas en una paciente con dolor crónico, impactando de manera positiva en su funcionalidad y calidad de vida.(AU)

The role of stem cell-derived exosomes in the repair of cutaneous and bone tissue.

Exosomes are extracellular vesicles secreted by various cell types, which play important roles in physiological processes. In particular, stem cell-derived exosomes have been shown to play crucial functions in intercellular communication during the tissue healing process. This review summarizes the effects of exosomes derived from different stem cell sources on the repair of cutaneous and bone tissue, focusing on the different pathways that could be involved in the regeneration process. The biogenesis, isolation, and content of exosomes have also been discussed. The effectiveness of exosomes is broadly demonstrated for skin and bone regeneration in animal models, supporting the basis for clinical translation of exosomes as a ready-to-use cell-free therapeutic for skin and bone regeneration.

"Do-not-touch" lesions of bone revisited.

Incidental bone lesions are encountered frequently in day-to-day practice. Many of these lesions are indeterminate requiring referral to specialist centres for further characterisation with or without biopsy; however, as biopsy has its own drawbacks, not all lesions can be subjected to biopsy. The primary role of a radiologist in these situations is to characterise these lesions based on their imaging appearances into aggressive lesions requiring biopsy and non-aggressive lesions that do not require a biopsy. The term "do-not-touch lesion" is used to describe a lesion with typical radiographic appearances that can be characterised based on radiographic appearances alone without needing a biopsy. With recent advances in imaging, many incidental lesions can be characterised into do-not-touch lesions based on their imaging appearances alone using a single imaging technique or using a combination of imaging techniques and, less frequently, with the additional help of serological investigations, without the need for biopsy. Hence, the definition of do-not-touch lesions of bone needs a revisit. In this article, we attempt to redefine do-not-touch lesions of bone and propose an imaging-based classification for characterisation of these lesions.

The first case of C4-Blast related death in Malaysia: A multidisciplinary approach illustrated with emphasis on conjoint anthropologic and radiologic expertise in forensic identification of skeletal remains.

BACKGROUND: Blast related deaths are often shrouded by diagnostic and medicolegal complexities requiring multidisciplinary expertise in order to gauge accurate identification of the victims and document scientific investigations comprehensively. In the advent of more sophisticated technology, anthropologic methods can now be applied into post mortem imaging interpretation. The traditional imaging roles of characterizing osseous fragmentation, detecting and localizing foreign bodies can be expanded to simulate and support physical anthropologic examination to assist in documentation for court proceedings. CASE PRESENTATION: An assemblage of unidentified, incomplete, highly fragmented skeletal remains were found scattered on a bare area of land in a forest. There was evidence of an explosion given the pattern of scattered evidentiary material of explosive and ballistic nature. Laboratory analysis of white powder found within the explosive material confirmed the presence of high impact C4-explosive trace containing cyclotrimethylene trinitramin [Royal Demolition Explosive (RDX)] & pentaerythritol tetranitrate (PETN). It took meticulous multidisciplinary efforts to confirm the identity of the victim that was marred by the severe fragmentation and skeletalization of the remains. The initial radiologic interpretation focused more on identification of foreign bodies and supporting documentation of fragmentation. With the current availability of post computed tomography (PMCT) in our center, we reexamined the value and potential of PMXR and PMCT as an adjunctive tool for biological profiling. CONCLUSION: This was the first case of C4-blast related death reported in Malaysia. The multidisciplinary approach in efforts to identify the victim may serve as a guide in managing, coordinating and maximizing the expertise of different forensic specialists, with emphasis on anthropologic and radiologic collaboration.