Metallic artifact suppression with MAVRIC-SL in magnetic resonance imaging for assessing chronic pain after hip or knee arthroplasty / Supressão do artefato metálico na ressonância magnética com MAVRIC-SL na avaliação da dor crônica em artroplastia de quadril ou joelho

Abstract Objective: To analyze the association between osteolysis at the prosthesis interfaces, as determined by magnetic resonance imaging (MRI) with multiacquisition variable-resonance image combination selective (MAVRIC-SL) sequences, and clinical severity after knee or hip arthroplasty, as well as to assess interobserver and intraobserver agreement on periprosthetic bone resorption. Materials and Methods: This was a cross-sectional study of 47 patients (49 joints) under postoperative follow-up after knee or hip arthroplasty, with chronic pain, between March 2019 and August 2020. All of the patients completed the Western Ontario and McMaster Universities Osteoarthritis Index (WOMAC) questionnaire. The component interfaces were evaluated and ordered into two groups: osseointegrated and osteolytic. Nonparametric tests were used. Results: There were significant differences between the two groups in terms of the mean WOMAC scores: total (p = 0.010); stiffness domain (p = 0.047); and function (p = 0.011) domains. There was substantial interobserver and intraobserver agreement for most analyses of the components. Conclusion: Periprosthetic osteolysis appears to be associated with clinical complaints of pain in the post-arthroplasty scenario, and MAVRIC-SL provides reproducible assessments. It could prove to be an important tool for orthopedists to use in the evaluation of challenging cases of chronic pain after arthroplasty.

Resumo Objetivo: Analisar associação entre osteólise nas interfaces protéticas por ressonância magnética com sequências MAVRIC-SL e a gravidade clínica dos pacientes submetidos a artroplastias de joelho ou quadril. Determinar concordância intraobservador e interobservador na reabsorção óssea peri-implante. Materiais e Métodos: Foi realizado estudo transversal entre março de 2019 e agosto de 2020, com 47 pacientes (49 articulações) em seguimento pós-operatório de artroplastias de joelho ou quadril, com dor crônica, que responderam ao questionário WOMAC. As interfaces dos componentes foram avaliadas e definiram dois grupos: osteointegrado e osteólise. Testes não paramétricos foram usados. Resultados: Houve diferença significativa na média do escore WOMAC entre os grupos (p = 0,010), assim como nos domínios rigidez (p = 0,047) e função (p = 0,011). Houve concordância substancial interobservador e intraobservador para a maioria dos componentes analisados. Conclusão: Osteólise periprótese parece estar associada com a queixa clínica de dor pós-artroplastia, com avaliação reprodutível pela MAVRIC-SL. Isto pode ser uma importante ferramenta para o ortopedista na avaliação de casos desafiadores de dor crônica pós-artroplastia.

Clinical and radiological improvement in Gorham-Stout disease after sirolimus treatment / Mejoría clínica y radiológica en la enfermedad de Gorham-Stout después del tratamiento con sirolimus

Abstract Background: Gorham-Stout disease (GSD) is a rare syndrome characterized by lymphatic malformations, mainly in bone structures, causing progressive osteolysis. Lymphatic endothelial cell proliferation depends on several growth factors that use the phosphoinositide-3 kinase (PI3K)/Akt pathway and converge on the mammalian target molecule of the rapamycin (mTOR) pathway. These findings have allowed treating GSD with mTOR pathway inhibitors such as sirolimus or everolimus. Case report: We present the case of a one-year-old female patient referred to our institution after a right femur fracture and progressive limb volume increase, disproportionately to the trauma. After several episodes of soft tissue infections, imaging studies showed pseudarthrosis, lytic lesions, and progressive loss of the right femur that ended in total absence. A femur biopsy showed lymphatic structures positive with D2-40 staining, diagnosing GSD. After six months of non-response to traditional treatments, the limb was disarticulated at the hip level, and oral sirolimus treatment was initiated, showing clinical and radiological improvement with minor lytic lesions and evidence of ossification after 20 months of treatment. Conclusions: Oral sirolimus treatment for GSD inhibits angiogenesis and osteoclastic activity, stimulating bone anabolism and leading to arrested osteolysis progression and improved ossification, quality of life, and patient prognosis. Therefore, sirolimus should be considered a therapeutic option for this rare disease.

Resumen Introducción: La enfermedad de Gorham-Stout es un trastorno poco frecuente caracterizado por malformaciones linfáticas localizadas sobre estructuras óseas que causan osteólisis progresiva. La proliferación de células endoteliales linfáticas depende de factores de crecimiento que utilizan la vía de la fosfoinositida-3 cinasa (PI3K)/Akt y convergen en la vía de la molécula diana de rapamicina de los mamíferos (mTOR). Este conocimiento ha permitido el tratamiento de esta enfermedad con inhibidores de esta vía como sirolimus o everolimus. Caso clínico: Se presenta el caso de una paciente de sexo femenino de un año referida a nuestra institución tras presentar fractura de fémur derecho y aumento de volumen de dicha extremidad posterior a un traumatismo. Después de diversos episodios de infecciones de tejidos blandos se realizaron estudios de imagen que mostraron pseudoartrosis, lesiones líticas y ausencia total del fémur derecho, así como una biopsia de fémur que mostró estructuras vasculares positivas con tinción D2-40, diagnosticándose enfermedad de Gorham-Stout. Durante su abordaje, se realizó la desarticulación de la extremidad a nivel de la cadera y se inició tratamiento con sirolimus oral, presentando una mejoría clínica y radiológica con menores lesiones líticas y evidencia de osificación posterior a 20 meses de tratamiento. Conclusiones: El tratamiento con sirolimus oral para la enfermedad de Gorham-Stout inhibe la actividad osteoclástica y la angiogénesis, estimulando el anabolismo óseo que resulta en la detención de la progresión de la osteólisis y una mejoría en la osificación, la calidad de vida y el pronóstico del paciente. Por tal motivo, el sirolimus debe considerarse como una opción terapéutica para esta enfermedad.

Síndrome de Gorham Stout en un paciente pediátrico. Presentación de un caso

Dentro de la clasificación de los síndromes de osteòlisis idiopática, la enfermedad de Gorham-Stout ocupa el cuarto lugar. Es un cuadro clínico caracterizado por la destrucción progresiva de tejido óseo y proliferación vascular, con angiomatosis y linfangiomatosis ósea que produce una osteòlisis progresiva del esqueleto, con pérdida de masa ósea en las áreas afectadas. Este artículo tiene como objetivo presentar un paciente pediátrico con síndrome de Gorham Stout atendido en el Hospital Provincial Pediátrico Universitario José Luis Miranda, de Villa Clara. Es una paciente femenina, de dos años de edad, con cuadro febril de una semana de evolución, aumento de volumen en región dorsal y pérdida de peso. Al examen físico se constataron palidez cutáneo-mucosa y lesión nodular indolora de tres centímetros en la región dorsal. Reapareció la fiebre y se observó marcado aumento de volumen en la región dorso lumbar. Mediante tomografía axial computarizada y resonancia magnética se evidenció osteòlisis de cuerpos vertebrales desde D8 a L2 y aumento de las partes blandas adyacentes. Las manifestaciones clínicas e imagenológicas obligaron a descartar etiologías infecciosas y neoformativas. Se descartaron las primeras y por cumplir con los criterios requeridos se concluyó como enfermedad de Gorham. Esta es una rara y peculiar condición patológica músculo-esquelética en la cual el hueso, virtualmente, se desintegra y es reemplazado por tejido conectivo vascular. Su etiología es especulativa, con una presentación clínica muy variable. Los estudios imagenológicos resultan de gran utilidad. Posee un pronóstico indeterminado a pesar de las opciones terapéuticas empleadas. Por ser un síndrome extremadamente raro se decidió la presentación del caso.

Within the idiopathic osteolysis syndromes classification, Gorham-Stout disease ranks fourth. It is a clinical picture characterized by the progressive destruction of bone tissue and vascular proliferation, with angiomatosis and bone lymphangiomatosis that produces a progressive osteolysis of the skeleton, with loss of bone mass in the affected areas. This article aims to present a pediatric patient with Gorham Stout syndrome treated at the José Luis Miranda University Pediatric Provincial Hospital in Villa Clara. A 2-years-old female patient with a one week fever evolution, increased volume in the dorsal region and weight loss. The physical examination revealed cutaneous-mucosal pallor and a three centimeters painless nodular lesion in the dorsal region. The fever recurred and a marked increase in volume was observed in the dorsal lumbar region. Computed axial tomography and magnetic resonance imaging revealed osteolysis of the vertebral bodies from D8 to L2 and an increase in the adjacent soft tissues. The clinical and imaging manifestations made it necessary to dismiss infectious and neoformative etiologies. The former were dismissed and because they fulfill the required criteria it was concluded as Gorham's disease. This is a rare and peculiar musculoskeletal pathological condition in which bone virtually disintegrates and is replaced by vascular connective tissue. Its etiology is speculative, with a highly variable clinical presentation. Imaging studies are very useful. It has an indeterminate prognosis despite the therapeutic options used. Because it is an extremely rare syndrome, the presentation of the case was decided.

Acro-osteolysis in a Filipino male with Vinyl chloride exposure: A case report

@#Occupational acro-osteolysis pertains to bone resorption of the distal phalanges of the hands and feet among workers with vinyl chloride exposure. We report the case of a Filipino man with osteolysis of the distal phalanges of the hands initially considered to have systemic sclerosis. The patient had gradual shortening of the fingers, thickening of the skin over the extremities, and hypopigmented patches over a span of more than 20 years. His lower extremities presented with non-pitting edema, skin thickening, and neuropathy, without shortening of the digits. Difficulty of ambulation was apparent due to the development of feet inversion. Radiographic findings of the hands and feet included resorption of distal phalanges, erosive and sclerotic changes, and narrowed joint spaces. Other conditions considered were Hansen’s disease, skeletal tuberculosis, and diabetic neuropathic arthropathy, which were eventually ruled out. The final diagnosis was occupational acro-osteolysis secondary to vinyl chloride exposure. The patient underwent serial total contact casting of the bilateral lower extremities to relieve bipedal edema and to reposition the feet. This case emphasizes the significance of investigating a patient’s occupational history and highlights a rare sequela of exposure to a commonly used chemical agent in the manufacture of polyvinyl chloride products.

Clinical characteristics and prognosis of 46 patients with macrofocal multiple myeloma / 中华内科杂志

The clinical characteristics, laboratory results, response to treatment, and prognosis of 46 macrofocal multiple myeloma(MFMM) patients at our center from January 2013 to December 2019 were analyzed retrospectively. The other 92 patients were selected as matched-controls based on diagnostic period and treatment. Among the 1 137 MM patients, 46 patients met the definition criteria of MFMM (4.0%), with median age 56 years, which was not statistically different from whole MM population ( P=0.066). According to the international staging system (ISS) and Revised ISS, the proportion of patients with advanced stage in MFMM group was less common than that of controls ( P<0.05). More plasmacytomas in MFMM patients were presented (43.5% vs. 18.5%, P<0.05). Regarding cytogenetic abnormalities, there were minor patients manifesting high-risk features in MFMM group (15.8% vs. 32.2%, P=0.058). Translocation(11;14) could be detected in 32.4% MFMM patients and 9.4% typical myeloma patients ( P<0.05). The treatment regimens were comparable. As to the best response of treatment, the complete response (CR) rate in MFMM group was significantly higher than that of controls (78.3% vs. 60.9%, P<0.05). The median follow-up time was 37.9 months. The median progression-free survival in MFMM and control groups were 77.5 vs. 39.8 months, respectively ( P<0.05). The overall survival (OS) of MFMM patients was significantly longer (not reached vs. 68.2 months, P<0.05).

Síndrome de Gorham Stout. Reporte de Caso

RESUMEN El Síndrome de Gorham Stout (GSS) es una enfermedad ósea de etiología desconocida, caracterizada por osteólisis, absorción idiopática y progresiva. Se presenta a cualquier edad, sin predilección por género o raza, puede afectar cualquier parte del esqueleto, el diagnóstico que se realiza es clínico, radiológico e histopatológico y por exclusión de otras afecciones comunes. El compromiso espinal es extremadamente raro y de mal pronóstico. También afecta las vísceras, una complicación común es el desarrollo de quilotórax, que ocurre en aproximadamente 20% de los pacientes y con lleva una alta tasa de mortalidad. No existen métodos de diagnósticos o tratamientos estándar para la enfermedad. Plantea un desafío para los médicos a la hora de diagnosticar y tratar adecuadamente al paciente. Se presenta el caso de una paciente de 5 años de edad, diagnosticada y manejada por un equipo multidisciplinario en el Hospital General Pediátrico (HGP), con revisión de la literatura.

ABSTRACT Gorham Stout Syndrome (GSS) is a bone disease of unknown etiology, characterized by idiopathic osteolysis and progressive absorption. It occurs at any age, without predilection for gender or race; it can affect any part of the skeleton, the diagnosis is clinical, radiological and histopathological and by exclusion of other common conditions. Spinal involvement is extremely rare and has a poor prognosis. It also affects the viscera, a common complication is the development of chylothorax, which occurs in approximately 20% of patients and carries a high mortality rate. There are no standard diagnostic methods or treatments for the disease. It poses a diagnostic and therapeutic challenge for clinicians. We present the case of a 5-year-old patient, diagnosed and managed by a multidisciplinary team at the Pediatric General Hospital (HGP), with a review of the literature on the topic.

Correlación clínico-radiológica como primera ruta en el diagnóstico de síndrome de Gorham-Stout / Clinical-radiological correlation as the first route in the diagnosis of Gorham-Stout syndrome

Resumen El síndrome de Gorham-Stout constituye una rara enfermedad ósea cuya etiología sigue siendo desconocida, que se caracteriza por presentar osteólisis y proliferación anormal de canales vasculares. Se describe el caso de un paciente masculino de 47 años quien consultó por un cuadro de aproximadamente 15 días de evolución consistente en edema, dolor, eritema y secreción sero-hemática por herida quirúrgica en hombro derecho, con diagnóstico reciente de artritis séptica. Refería antecedente de síndrome de Gorham-Stout, evidenciándose al examen físico y radiografía comparativa de hombros. La presentación clínica de estos pacientes depende del área afectada y la extensión de la enfermedad, convirtiéndose su diagnóstico en un desafío en caso de que el deterioro se presente en zonas no expuestas. El principal síntoma consiste en dolor localizado, acompañado de hinchazón, debilidad y deterioro funcional de las extremidades afectadas. Estos pacientes pueden permanecer asintomáticos hasta sufrir una fractura ósea espontáneamente o después de un trauma menor

Abstract Gorham-Stout syndrome is a rare bone disease whose etiology remains unknown, characterized by osteolysis and abnormal proliferation of vascular channels. We describe the case of a 47-year-old male patient who consulted for 15 days of evolution of edema, pain, erythema and seroma expulsion from surgical wound in the right shoulder, with a recent diagnosis of septic arthritis. He referred a history of Gorham-Stout syndrome, evidenced with physical examination and comparative radiography of the shoulders. The clinical presentation of these patients depends on the affected area and the extent of the disease, making their diagnosis a challenge in case the deterioration occurs in unexposed areas. The main symptom is localized pain, accompanied by swelling, weakness and functional impairment of the affected limbs. These patients may remain asymptomatic until suffering a bone fracture spontaneously or after minor trauma

Risk Factors for Coracoid Graft Osteolysis after the Open Latarjet Procedure / Fatores de risco para osteólise do enxerto do coracoide após o procedimento de Latarjet aberto

Abstract Objective Coracoid osteolysis has been described as a possible complication after the Latarjet procedure. The aim of the present study was to investigate the incidence and risk factors associated to coracoid graft osteolysis and to correlate them with clinical results. Methods A retrospective review of 38 Latarjet procedures was conducted. Computed tomography (CT) scans were obtained from all of the patients before and at least 1 year after the surgery. Coracoid osteolysis was evaluated and correlated to preoperative factors, namely: age, smoking status, and preoperative glenoid bone loss. The patients were divided into 2 groups: A (no or minor bone resorption) and B (major or total bone resorption). The functional outcome was determined by the Rowe score. Results Coracoid graft osteolysis occurred in 22 cases (57.8%). The mean preoperative glenoid defect was 22.8% in group A, and 13.4% in group B (p= 0.0075). The mean ages of the subjects in both groups were not significantly different. Smoking did not seem to affect the main outcome either, and no correlation was found between graft osteolysis and postoperative range of motion, pain, or Rowe score. There were no cases of recurrent dislocations in our sample, although four patients presented with a positive anterior apprehension sign. Conclusion Bone resorption of the coracoid graft is present in at least 50% of the patients submitted to the Latarjet procedure, and the absence of significant preoperative glenoid bone loss showed to be the only risk factor associated with severe graft osteolysis, even though this did not influence significantly the clinical outcome.

Resumo Objetivo Osteólise do processo coracoide é descrita como uma possível complicação da cirurgia de Latarjet. O objetivo do presente estudo foi avaliar a incidência e fatores de risco associados à osteólise do enxerto do coracoide e correlacioná-los com resultados clínicos. Métodos Foi realizada uma revisão retrospectiva incluindo 38 casos submetidos ao procedimento de Latarjet. Em todos os casos, foi realizada uma tomografia computadorizada antes e pelo menos 1 ano após a cirurgia. A presença de osteólise do coracoide foi avaliada e correlacionada com os seguintes fatores de risco: idade, tabagismo, e perda óssea pré-operatória da glenóide. Os pacientes foram divididos em dois grupos: A (ausência ou menor reabsorção óssea) e B (maior reabsorção óssea ou total). A avaliação funcional foi determinada através do escore de Rowe. Resultado Osteólise do processo coracoide ocorreu em 22 casos (57,8%). O defeito ósseo médio pré-operatório da glenóide foi de 22,8% no grupo A e de 13,4% no grupo B (p= 0.0075). A média de idade dos casos em ambos os grupos não apresentou diferença estatística. Tabagismo também não esteve relacionado com diferenças no resultado. Não houve correlação entre a presença de osteólise e o arco de movimento, dor ou ao escore de Rowe. Não houve casos de reluxação; entretanto, quatro pacientes apresentaram apreensão anterior no exame físico. Conclusão A reabsorção do processo coracoide ocorreu em pelo menos 50% dos pacientes submetidos à cirurgia de Latarjet, e a ausência pré-operatória de perda óssea significativa da glenóide foi o único fator de risco associado a osteólise mais severa do enxerto, porém sem influência no resultado clínico.

Quiste óseo aneurismático secundario a linfoma: hallazgos imagenológicos. Reporte de casos / Aneurismatyc bone cyst secondary to lymphoma: Radiological findings and cases report

Resumen Objetivo: Presentar reportes de casos de Quístes óseos aneurismáticos secundarios a linfomas y breve revisión del tema. Materiales y métodos: Se analizaron las imágenes en el archivo del servicio de radiología e imágenes diagnósticas de pacientes que acudieron a la Fundación Oftalmológicas de Santander - Clínica Carlos Ardila Lülle (FOSCAL) a quienes se les diagnosticó quiste óseo aneurismático secundario a linfoma. Resultados: Se reportan 2 casos clínicos de pacientes a quienes se diagnosticó lesión tumor ósea expansiva correspondiente a quiste óseo aneurismático secundario a Linfoma. Conclusiones: El quiste óseo aneurismatico es un raro tumor que constituye solo el 1-2% de los tumores óseos. Afecta principalmente la metáfisis de los huesos largos y se da predominantemente en el paciente adulto joven que está cursando la segunda década de vida. A pesar de existir múltiples teorías acerca de su origen aún no se tiene una etiología clara. Se diagnosticó lesión tumor ósea expansiva correspondiente a quiste óseo aneurismático secundario a Linfoma. Conclusiones: el quiste óseo aneurismatico es un raro tumor que constituye solo el 1-2% de los tumores óseos. Afecta principalmente la metáfisis de los huesos largos y se da predominantemente en el paciente adulto joven que está cursando la segunda década de vida. A pesar de existir múltiples teorías acerca de su origen aún no se tiene una etiología clara. El abordaje diagnóstico es específicamente con resonancia magnética, sin embargo se debe confirmar el diagnóstico histo-patológico para conocer la etiología de base.

Abstract Objective: To Present case reports and a brief review of aneurysmal bone cysts secondary to lymphomas. Material and Methods: Images from the archive of the Radiology and Diagnostic imaging department were obtained from patients seen at the Fundación Oftalmológica de Santander - Carlos Ardila Lülle Clínic (FOSCAL) being diagnosed of an aneurysmal bone cyst secondary to lymphoma. Results: Two clinical cases were reported on patients who developed a cystic bone tumor corresponding to an aneurysmatic bone cyst secondary to lymphoma. Conclusions: The aneurysmatic bone cyst is a rare tumor that constitutes only 1-2% of bone tumors. It mainly affects the metaphysis of long bones and occurs predominantly in young adult patients who are in the second decade of life. Despite the existence of multiple theories about its origin, there is still no clear etiology. The diagnostic approach is radiological, specifically with magnetic resonance images however, the diagnostic must be confirmed with histopathological studies.

Multiple osteolytic lesions due to Double-Expressor Primary non-Hodgkin Lymphoma of the Bone

Primary non-Hodgkin lymphoma of the bone (PLB) is a rare type of non-Hodgkin's lymphoma (NHL) that affects the skeletal system with or without regional lymph node involvement. We present the case of a 74-year-old female patient with pain due to multifocal osteolytic lesions. The diagnosis of diffuse large B-cells (non-GCB) phenotype was made by clinical, laboratory, histopathological examination accompanied by an extensive immunohistochemical profile of one of the skeletal lesions.

Orthotic management with a customized humeral brace for Gorham-Stout disease of the humerus: A case report

@#Gorham-Stout disease is characterized by massive osteolysis or "vanishing bone" on radiograph. Due to its rarity, no standard Physical Medicine and Rehabilitation (PM&R) management has been published. With this comes the dilemma of managing another case of vanishing right humerus in a 13 year-old male, right handed student, with normal growth and development. To date, this could be the third documented case in the Philippines, but the first with humeral involvement, and the first to manage using a customized humeral brace. The absence of the right humerus affects the bimanual overhead and tabletop activities of the patient, for which a custom-made humeral orthosis was provided to manage the limited activities. There were improvements in activities such as writing, card turning, stacking, and lifting objects of variable weights, as well as with hand dexterity as evidenced by the standardized hand function tests done prior and post brace fitting. Being a rare bone disease with no standard management and unpredictable course, cases are managed symptomatically. For this case of an absent humerus significantly affecting upper extremity function, orthotic management is one aspect that could be recommended to achieve positive functional outcomes.

Bone-seeking nanoplatform co-delivering cisplatin and zoledronate for synergistic therapy of breast cancer bone metastasis and bone resorption

The "vicious cycle" established between tumor growth and osteolysis aggravates the process of breast cancer bone metastasis, leading to life-threatening skeletal-related events that severely reduce survival and quality of life. To effectively interrupt the "vicious cycle", innovative therapeutic strategies that not only reduce osteolysis but also relieve tumor burden are urgently needed. Herein, a bone-seeking moiety, alendronate (ALN), functionalized coordination polymer nanoparticles (DZ@ALN) co-delivering cisplatin prodrug (DSP) and antiresorptive agent zoledronate (ZOL)

Establishment of artificial joint aseptic loosening mouse model by cobalt-chromium particles stimulation / 中国修复重建外科杂志

Objective: To explore the feasibility of establishment of a artificial joint aseptic loosening mouse model by cobalt-chromium particles stimulation. Methods: Twenty-four 8-week-old male severe combined immunodeficient (SCID) mice were divided into experimental group ( n=12) and control group ( n=12). The titanium nail was inserted into the tibial medullary cavity of mouse in the two groups to simulate artificial joint prosthesis replacement. And the cobalt-chromium particles were injected into the tibial medullary cavity of mouse in experimental group. The survival of the mouse was observed after operation; the position of the titanium nail and the bone mineral density of proximal femur were observed by X-ray film, CT, and Micro-CT bone scanning; and the degree of dissolution of the bone tissue around the tibia was detected by biomechanical test and histological staining. Results: Two mice in experimental group died, and the rest of the mice survived until the experiment was completed. Postoperative imaging examination showed that there was no obvious displacement of titanium nails in control group, and there were new callus around the titanium nails. In experimental group, there was obvious osteolysis around the titanium nails. The bone mineral density of the proximal tibia was 91.25%±0.67%, and the maximum shear force at the tibial nail-bone interface was (5.93±0.85) N in experimental group, which were significantly lower than those in control group [102.07%±1.87% and (16.76±3.09) N] ( t=5.462, P=0.041; t=3.760, P=0.046). Histological observation showed that a large number of inflammatory cells could be seen around the titanium nails in experimental group, while there was no inflammatory cells, and obvious bone tissue formation was observed in control group. Conclusion: The artificial joint aseptic loosening mouse model can be successfully established by cobalt-chromium particles stimulation.

Osteoclasts in the Inflammatory Arthritis: Implications for Pathologic Osteolysis

The enhanced differentiation and activation of osteoclasts (OCs) in the inflammatory arthritis such as rheumatoid arthritis (RA) and gout causes not only local bone erosion, but also systemic osteoporosis, leading to functional disabilities and morbidity. The induction and amplification of NFATc1, a master regulator of OC differentiation, is mainly regulated by receptor activator of NF-κB (RANK) ligand-RANK and calcium signaling which are amplified in the inflammatory milieu, as well as by inflammatory cytokines such as TNFα, IL-1β and IL-6. Moreover, the predominance of CD4+ T cell subsets, which varies depending on the condition of inflammatory diseases, can determine the fate of OC differentiation. Anti-citrullinated peptide antibodies which are critical in the pathogenesis of RA can bind to the citrullinated vimentin on the surface of OC precursors, and in turn promote OC differentiation and function via IL-8. In addition to adaptive immunity, the activation of innate immune system including the nucleotide oligomerization domain leucine rich repeat with a pyrin domain 3 inflammasome and TLRs can regulate OC maturation. The emerging perspectives about the diverse and close interactions between the immune cells and OCs in inflammatory milieu can have a significant impact on the future direction of drug development.

Effect of salmon calcitonin on RANK/RANKL/OPG osteolysis pathway in human macrophages after particle induction / 中国医师杂志

Objective To explore the effect of salmon calcitonin on the receptor activator of NF-κB/receptor activator of NF-κB ligand/osteoprotegerin (RANK/RANKL/OPG) osteolysis pathway in human macrophages after particles induction.Methods The polyethylene wear particles were extracted from the periacetabular boundary membrane tissue of a patient with hip prosthesis loosening.The optimal reaction cell concentration of human macrophages to polyethylene wear particles (with a concentration of 0.1 mg/ml) was measured by methyl thiazolyl tetrazolium (MTT) assay.Particles were used to stimulate human macrophages,while salmon calcitonin with different drug concentrations was used for intervention.They were randomly divided into five groups,with six parts in each group:Group A,control group;Group B,particle group;Group C,particle + salmon calcitonin (10-8 mol/L) group;Group D,particle + salmon calcitonin (10-10 mol/L) group;Group E,particle+salmon calcitonin (10-12 mol/L) group.After cocultured for 48 hours,quantitative polymerase chain reaction (qPCR) assay was used to detect the mRNA expression of RANK,RANKL and OPG in macrophages.Results After induction with particles,Group B had a higher expression in RANK and RANKL,and lower OPG expression than Group A.After salmon calcitonin intervention,the expression of RANK and RANKL were significantly decreased,and OPG expression was significantly increased.Group B had the highest RANKL/OPG rate.After drug intervention,the RANKL/OPG rate in C,D,E group were reduced.Conclusions The particles can induce the transformation of macrophages into osteoclasts.In addition to directly inhibiting osteoclast activity,salmon calcitonin prevents macrophage from differentiating into osteoclasts through modulating RANKL/RANK/OPG signaling pathway.

Pentamidine Inhibits Titanium Particle-Induced Osteolysis In Vivo and Receptor Activator of Nuclear Factor-κB Ligand-Mediated Osteoclast Differentiation In Vitro

BACKGROUND: Wear debris-induced osteolysis leads to periprosthetic loosening and subsequent prosthetic failure. Since excessive osteoclast formation is closely implicated in periprosthetic osteolysis, identification of agents to suppress osteoclast formation and/or function is crucial for the treatment and prevention of wear particle-induced bone destruction. In this study, we examined the potential effect of pentamidine treatment on titanium (Ti) particle-induced osteolysis, and receptor activator of nuclear factor-κB ligand (RANKL)-induced osteoclastogenesis. METHODS: The effect of pentamidine treatment on bone destruction was examined in Ti particle-induced osteolysis mouse model. Ti particles were implanted onto mouse calvaria, and vehicle or pentamidine was administered for 10 days. Then, calvarial bone tissue was analyzed using micro-computed tomography and histology. We performed in vitro osteoclastogenesis assay using bone marrow-derived macrophages (BMMs) to determine the effect of pentamidine on osteoclast formation. BMMs were treated with 20 ng/mL RANKL and 10 ng/mL macrophage colony-stimulating factor in the presence or absence of pentamidine. Osteoclast differentiation was determined by tartrate-resistant acid phosphatase staining, real-time polymerase chain reaction, and immunofluorescence staining. RESULTS: Pentamidine administration decreased Ti particle-induced osteoclast formation significantly and prevented bone destruction compared to the Ti particle group in vivo. Pentamidine also suppressed RANKL-induced osteoclast differentiation and actin ring formation markedly, and inhibited the expression of nuclear factor of activated T cell c1 and osteoclast-specific genes in vitro. Additionally, pentamidine also attenuated RANKL-mediated phosphorylation of IκBα in BMMs. CONCLUSION: These results indicate that pentamidine is effective in inhibiting osteoclast formation and significantly attenuates wear debris-induced bone loss in mice.

Giant Tophi Involving Both Suprapatellar Pouches and Upper Poles of the Patellae: Treatment with Febuxostat and the 6 Years Follow-Up / 대한정형외과학회잡지

Tophi is one of the clinical manifestations of gout. On the other hand, it does not draw the patient's attention when it is asymptomatic, which leads to delayed management. The current case is a typical example of delayed diagnosis and management. The authors' preferred management of tophi was medical not surgical, even though the hitherto therapeutic issue has been conservative versus surgical. The authors chose conservative treatment in the osteolytic lesion resulting from huge tophi in the patella, and the report the results of 6 years follow-up.

Short-term clinical efficacy of three dimension printed titanium augments for the reconstruction of acetabular bone defects in revision total hip arthroplasty / 国际外科学杂志

Objective To evaluate the short-term clinical efficacy of three dimension printed titanium augments for the reconstruction of acetabular bone defects in revision total hip arthroplasty.Methods The retrospective study was conducted.To retrospectively analyze clinical data of 21 patients who were underwent revision total hip arthroplasty with severe acetabular bone defects reconstructed by three dimension printed titanium augment from March 2016 to September 2017 from Department of Orthopaedics,Beijing Friendship Hospital,Capital Medical University.There were 9 males and 12 females,age (58.9 ± 6.3) years,51-67 years,body mass index (23.8 ± 2.9) kg/m2.According preoperative CT scan of hip joints,three dimension printed titanium augments were designed for acetabular defects personality.The data including the vertical distance from centre of rotation to the interteardrop line in X-ray examination,preoperative Harris score,final follow-up Harris score of hip postoperatively,and complications were recorded.Outpatient visits ranged from 11.8 to 19.6 months.Measurement data were expressed as (Mean ± SD),and t test was used before and after surgery.Results For X-ray examination,the average vertical distance from centre of rotation to the interteardrop line was (6.1 ± 1.2) cm preoperatively and (2.8 ± 0.7) cm postoperatively,and the difference was statistically significant (P ＜ 0.01).The hip Harris score increased from preoperative (47.5 ± 6.4) scores to the last follow-up (84.6 ± 5.9) scores,and the difference was statistically significant (P ＜ 0.01).The final follow-up data showed the acetabular prosthesis and augments were stable,while there were no hip joint dislocation,periprosthetic joint infection,loosening of acetabular components and other complications.Conclusion Three dimension printed augments can reconstruct severe acetabular bone defects and restore the hip rotation centre.

Control imagenológico de un quiste óseo simple: reporte de un caso / Imagenological control of a simple bone cyst: case report

El quiste óseo simple (QOS), es considerado un pseudoquiste por no tener tejido de revestimiento epitelial. Esta lesión es más frecuente en pacientes de sexo masculino afectando mayormente el maxilar inferior, comprometiendo la zona posterior mandibular con mayor frecuencia y también la zona sinfisiaria. Algunos autores lo han relacionado a trauma o degeneración quística dejando una cavidad ósea vacía. Su diagnóstico suele ser por hallazgo radiológico, presentándose como una imagen radiolúcida unilocular o multilocular bien definida o irregular, de bordes corticalizados finos. Su característica principal es el festoneado circundante a las raíces de las piezas dentarias. En este artículo presentamos a un paciente de sexo masculino de 21 años, al cual le detectaron incidentalmente a través de la radiografía panorámica una lesión quística. Luego de 2 años de seguimiento imagenológico, se evidenció a disminución de la lesión. La finalidad de éste reporte es presentar las características imagenológicas de los quistes óseos imples.

The simple bony cyst (SBCs) is considered a pseudocyst because it does not have epithelial lining tissue. This lesion is more frequent in male patients, mainly affecting the lower jaw, involving the posterior mandibular area more frequently and also the symphysial area. Some authors have related it to trauma or cystic degeneration leaving an empty bone cavity. Its diagnosis is usually by radiological finding, presenting as a well-defined or irregular unilocular or multilocular radiolucent image, with thin corticalized edges. Its main characteristic is the scalloping surrounding the roots of the teeth. In this article, we present a male patient of 21 years, who was detected incidentally through the panoramic radiography a cystic lesion. After 2 years of imaging follow-up, the decrease in the lesion was evidenced.The purpose of this report is to present the imaging characteristics of simple bone cysts.

α-Tocopheryl Succinate Inhibits Osteolytic Bone Metastasis of Breast Cancer by Suppressing Migration of Cancer Cells and Receptor Activator of Nuclear Factor-κB Ligand Expression of Osteoblasts

BACKGROUND: Breast cancer is one of the most common cancers affecting women and has a high incidence of bone metastasis, causing osteolytic lesions. The elevated expression of receptor activator of nuclear factor-κB ligand (RANKL) in cancer activates osteoclasts, leading to bone destruction. We previously reported that α-tocopheryl succinate (αTP-suc) inhibited interleukin-1-induced RANKL expression in osteoblasts. Here, we examined the effect of αTP-suc on osteolytic bone metastasis in breast cancer. METHODS: To examine the effect of αTP-suc on the metastatic capacity of breast cancer, MDA-MB-231-FL cells were injected into the left cardiac ventricle of BALB/c nude mice along with intraperitoneal injection of αTP-suc. The mice were then analyzed by bioluminescence imaging. To investigate the effect of αTP-suc on osteolysis, 4T1 cells were directly injected into the femur of BALB/c mice along with intraperitoneal injection of αTP-suc. Microcomputed tomography analysis and histomorphometric analysis of the femora were performed. RESULTS: αTP-suc inhibited cell migration and cell growth of 4T1 cells. In line with these results, bone metastasis of MDA-MB-231-FL cells was reduced in mice injected with αTP-suc. In addition, αTP-suc decreased osteoclastogenesis by inhibiting 4T1-induced RANKL expression in osteoblasts. Consistent with these results, 4T1-induced bone destruction was ameliorated by αTP-suc, with in vivo analysis showing reduced tumor burden and osteoclast numbers. CONCLUSIONS: Our findings suggest that αTP-suc may be efficiently utilized to prevent and treat osteolytic bone metastasis of breast cancer with dual effects.