Biological parameters for quality evaluation of allografts from the Brazilian National Institute of Traumatology and Orthopedics tissue bank.

Bone allografts are clinically used in a variety of surgical procedures, and tissue banks are responsible for harvesting, processing, quality testing, storing, and delivering these materials for transplantation. In tissue banks, the bone is processed for the removal of all organic content, remaining only the tissue structure (scaffold). However, several studies have shown that even after using different processing methods, viable cells, functional proteins, and DNA may still persist in the tissue, which constitute the main causes of graft rejection. Therefore, the objective of this study was to establish techniques and biological parameters for quality validation of allografts. To this end, we propose the use of 3 combined methods such as microscopy, histology, and molecular biology techniques to evaluate the quality of allografts harvested and processed by the Brazilian National Institute of Traumatology and Orthopedics (INTO) tissue bank according to the donation criteria of the Brazilian National Health Surveillance Agency and the Brazilian National Transplant System. Bone fragments from different processing stages showed no viable cells on histology, an intact extracellular matrix on scanning electron microscopy, and gradual reduction in DNA amount. Different techniques were used to demonstrate the quality of allografts produced by the INTO tissue bank and to establish biological parameters for ensuring the safety and quality of these products. Future studies need to be undertaken to assess and validate the efficacy of the decellularization process in larger bone grafts with diverse architectural configurations.

The optimized tourniquet versus no tourniquet in total knee arthroplasty. Analysis of muscle injury, functional recovery, and knee strength.

Background: Tourniquet is widely used in total knee replacement surgery because it reduces intraoperative hemorrhage and provides a comfortable surgical area for the surgeon. It's possible that its use could lead to impaired postoperative functional and motor recovery, as well as local and systemic complications. Our goal was to compare the outcomes of total knee replacement without ischemia using an optimized protocol, consisting of tourniquet inflation before skin incision and deflation after cementing, with a pressure of one hundred millimeters above systolic blood pressure and without postoperative articular suction drains.). We believed that tourniquet effectively would result in no additional muscle damage and no functional or knee strength impairment compared to no tourniquet. Methods: In a prospective and randomized study, 60 patients with osteoarthritis were evaluated for total knee replacement, divided in two groups: 'without tourniquet' and 'optimized tourniquet'. Outcomes were mean creatine phosphokinase levels, Knee Society Score and knee isokinetic strength. Data were considered significant when p < 0.05. Results: Creatine phosphokinase levels and functional score were similar between groups. There were no differences between groups regarding knee extension strength on the operated limbs, although the knee flexors' peak torque in the operated limb in the optimized tourniquet group was significantly higher at 6 months relative to preoperative and 3 months assessments. Conclusions: The optimized tourniquet protocol use in total knee replacement combines the benefits of tourniquet use without compromising functional recovery and without additional muscle damage and strength deficits compared to surgery without its use.

A new option for bone regeneration: a rapid methodology for cellularization of allograft with human bone marrow stromal cells with in vivo bone-forming potential.

The treatment of severe musculoskeletal injuries, such as loss of bone tissue and consolidation disorders, requires bone transplantation, and the success of this bone reconstruction depends on the grafts transplant's osteogenic, osteoconductive, and osteoinductive properties. Although the gold standard is autograft, it is limited by availability, morbidity, and infection risk. Despite their low capacity for osteoinduction and osteogenesis, decellularized bone allografts have been used in the search for alternative therapeutic strategies to improve bone regeneration. Considering that bone marrow stromal cells (BMSCs) are responsible for the maintenance of bone turnover throughout life, we believe that associating BMSCs with allograft could produce a material that is biologically similar to autologous bone graft. For this reason, this study evaluated the osteogenic potential of bone allograft cellularized with BMSCs. First, BMSC was characterized and allograft decellularization was confirmed by histology, scanning electron microscopy, and DNA quantification. Subsequently, the BMSCs and allografts were associated and evaluated for adhesion, proliferation, and in vitro and in vivo osteogenic potential. We demonstrated that, after 2 hours, BMSCs had already adhered to the surface of allografts and remained viable for 14 days. In vitro osteogenic assays indicated increased osteogenic potential of allografts compared with beta-tricalcium phosphate (ß-TCP). In vivo transplantation assays in immunodeficient mice confirmed the allograft's potential to induce bone formation, with significantly better results than ß-TCP. Finally, our results indicate that allograft can provide structural support for BMSC adhesion, offering a favorable microenvironment for cell survival and differentiation and inducing new bone formation. Taken together, our data indicate that this rapid methodology for cellularization of allograft with BMSCs might be a new therapeutic alternative in regenerative medicine and bone bioengineering.

Onlay Technique for Posterior Cruciate Ligament Reconstruction: The Paccola's Technique.

The primary function of the posterior cruciate ligament (PCL) is to restrict the posterior translation of the tibia, and its secondary function is to limit the tibial external rotation, mainly at 90° and 120° of knee flexion. The prevalence of PCL rupture ranges between 3% and 37% of patients with knee ligament tears. This ligament injury often is associated with other ligament injuries. Surgical treatment is recommended for acute PCL injuries associated with knee dislocations or when stress radiographs show a tibial posteriorization greater than or equal to 12 mm. The techniques classically described for the surgical treatment are inlay and transtibial, which can be performed in a single- or double-bundle fashion. Biomechanical studies suggest that the double-bundle technique is superior to the single femoral bundle, suggesting less postoperative laxity. However, such superiority has not yet been proven in clinical studies. This paper will describe the step-by-step technique for PCL surgical reconstruction. The tibial fixation of the PCL graft is performed by using a screw and spiked-washer, and the femoral fixation can be done with a single- or double-bundle technique. We will explain the surgical steps in detail, with tips to perform them simply and safely.

Optimized Tourniquet Use in Primary Total Knee Arthroplasty: A Comparative, Prospective, and Randomized Study.

BACKGROUND: The results of recent studies investigating tourniquet (TNQ) use for knee arthroplasty are controversial. Therefore, this study aimed to compare patients undergoing total knee arthroplasty who did not have a TNQ to those in whom an optimized TNQ protocol was applied. METHODS: We prospectively evaluated 127 patients who had knee osteoarthritis who had undergone total knee arthroplasty and randomized them into two groups: "without TNQ" and "optimized TNQ" (TNQ inflation before skin incision, deflation after cementing, with pressure one hundred millimeters of mercury above the systolic blood pressure, and without articular suction drain usage). The means of surgery and TNQ duration, blood loss, number of blood transfusions, degree of pain, edema, range of motion (ROM), functional score over time, and postoperative complications were compared between the groups. Statistical significance was set at P < .05. RESULTS: No significant differences were found in terms of surgical timing, blood loss, thigh and knee pain, edema, ROM, functional scores, and complications between the "without TNQ" and "optimized TNQ" groups. CONCLUSION: The use of an optimized TNQ in primary total knee arthroplasty presents similar clinical results to surgery without a TNQ and did not increase the incidence of postoperative complications. Its use allowed surgery to occur with the benefits of a clean and dry surgical field provided by TNQ without increasing procedure-related comorbidities.

Isolated open tibial shaft fracture: a seven-hospital, prospective observational study in two Latin America countries.

INTRODUCTION: open tibial fractures are challenging due to the frequent severe bone injury associated with poor soft tissue conditions. This is relevant in low- and middle-income countries, mainly related to delayed definitive fixation and lack of adequate training in soft tissue coverage procedures. Due to these factors, open tibial fracture is an important source of disability for Latin American countries. Herein we sought to provide an epidemiological overview of isolated open tibial shaft fracture across seven hospitals in southern cone of Latin America. The secondary goal was to assess the impact on quality of life based on return-to-work rate (RWR). METHODS: patients with an isolated open tibial shaft fracture treated in seven different hospitals from Brazil and Argentina from November 2017 to March 2020 were included in the study. Clinical and radiographic results were evaluated throughout the 120-day follow-up period. Final evaluation compared RWR with the SF-12 questionnaire, bone healing, and gait status. RESULTS: Seventy-two patients were treated, 57 followed for 120 days and 48 completed the SF-12 questionnaire. After 120 days, 70.6% had returned to work, 61.4% had experienced bone healing. Age, antibiotic therapy, type of definitive treatment, and infection significantly influenced the RWR. Gait status exhibited strong correlations with RWR and SF-12 physical component score. CONCLUSIONS: Isolated open tibial shaft fractures are potentially harmful to the patient's quality of life after 120 days of the initial management. RWR is significantly higher for younger patients, no history of infection, and those who could run in the gait status assessment.

Pulsed Radiofrequency Rhizotomy of the Genicular Nerves of the Knee Guided by Radioscopy and Ultrasonography: Step-By-Step Technique.

Osteoarthritis (OA) of the knee is highly prevalent and causes pain, stiffness, and harms the quality of life of millions of patients. Scientific evidence about radiofrequency ablation or rhizotomy of genicular nerves has been presented with increasing frequency in the literature for the treatment of chronic pain related to knee OA as an alternative to total knee arthroplasty. The main indication for this procedure is symptomatic OA unresponsive to conservative treatment, regardless of the disease evolution, although more common indications are in Kellgren-Lawrence grade III or IV, in post-total knee arthroplasty residual pain without an identified cause, in patients with comorbidities and high surgical risk, and those who do not want to undergo surgery. The aim of this study is to describe the step-by-step rhizotomy technique with pulsed radiofrequency of the 3 genicular nerves, guided by radioscopy and ultrasonography.

The Value of a Standardized Knee Functional Assessment in Predicting the Outcomes of Total Knee Arthroplasty.

Questionnaires and physical tests are tools to determine the ability of an individual to perform tasks of the daily living. In our institution, a standardized knee performance evaluation including patient-reported outcome measures (PROMs) and physical performance tests has been applied to all patients undergoing total knee arthroplasty (TKA). Our goal was to identify which preoperative tools influence the outcomes of a TKA and if physical performance tests can be of value if used along with PROMs in predicting functional outcomes. Classification and regression tree was used to analyze which preoperative factors influence function after TKA. Western Ontario and McMaster Universities Arthritis Index (WOMAC) function (WOMAC-F), 6-minute walk test (6MWT), and timed up and go (TUG) test at the 12th postoperative month were the dependent variables. Age, body mass index, preoperative WOMAC function and pain score, muscle strength, 6MWT, and TUG test score were used as preoperative predictors of dependent variables. TUG ≤19.3 seconds and age <62 years were preoperative predictors of better scores in the WOMAC-F (5.5). Strength of extensor muscles of the nonoperated knee ≥99.43 N·m/kg and 6MWT> 328 m were preoperative predictors of a better postoperative 6MWT (499 m). TUG <12.3 seconds and 6MWT ≥421 m were preoperative predictors of better postoperative TUG (7.3 seconds). Preoperative performance in physical tests had an influence on postoperative outcome scores than PROMs after TKA. Less age, good muscular strength, greater capacity of walking, and smaller TUG times were associated with better outcomes.

Isolated open tibial shaft fracture: a seven-hospital, prospective observational study in two Latin America countries / Fraturas expostas isoladas da diáfise da tíbia: estudo prospectivo observacional em sete hospitais de dois países da América Latina

ABSTRACT Introduction: open tibial fractures are challenging due to the frequent severe bone injury associated with poor soft tissue conditions. This is relevant in low- and middle-income countries, mainly related to delayed definitive fixation and lack of adequate training in soft tissue coverage procedures. Due to these factors, open tibial fracture is an important source of disability for Latin American countries. Herein we sought to provide an epidemiological overview of isolated open tibial shaft fracture across seven hospitals in southern cone of Latin America. The secondary goal was to assess the impact on quality of life based on return-to-work rate (RWR). Methods: patients with an isolated open tibial shaft fracture treated in seven different hospitals from Brazil and Argentina from November 2017 to March 2020 were included in the study. Clinical and radiographic results were evaluated throughout the 120-day follow-up period. Final evaluation compared RWR with the SF-12 questionnaire, bone healing, and gait status. Results: Seventy-two patients were treated, 57 followed for 120 days and 48 completed the SF-12 questionnaire. After 120 days, 70.6% had returned to work, 61.4% had experienced bone healing. Age, antibiotic therapy, type of definitive treatment, and infection significantly influenced the RWR. Gait status exhibited strong correlations with RWR and SF-12 physical component score. Conclusions: Isolated open tibial shaft fractures are potentially harmful to the patient's quality of life after 120 days of the initial management. RWR is significantly higher for younger patients, no history of infection, and those who could run in the gait status assessment.

RESUMO Introdução: o tratamento de fraturas expostas isoladas da diáfise da tíbia (FEIDT) apresenta desafios por frequentemente associar severa lesão óssea com condições ruins de tecido mole, fatores relevantes em países de média e baixa renda, especialmente devido a atrasos na implementação da fixação definitiva e falta de treinamento adequado no manejo de tecidos moles. Consequentemente, FEIDTs representam importante fonte de incapacitação na América Latina. Este estudo objetivou apresentar uma visão geral das FEIDTs em sete hospitais do cone sul da América Latina. O objetivo secundário foi avaliar o seu impacto na qualidade de vida baseado na taxa de retorno ao trabalho (TRT). Métodos: foram incluídos no estudo pacientes com FEIDT tratados em sete hospitais de Brasil e Argentina entre novembro de 2017 e março de 2020. Resultados clínicos e radiográficos foram analisados num período de 120 dias. Avaliação final comparou TRT com o questionário SF-12, consolidação óssea e condições de marcha. Resultados: setenta e dois pacientes foram tratados, 57 seguidos por 120 dias e 48 completaram o questionário SF-12. Após 120 dias, 70,6% havia retornado ao trabalho, 61,4% tinha fratura consolidada. Idade, antibioticoterapia, tipo de tratamento definitivo e infecção influenciaram significativamente na TRT. A condição de marcha apresentou forte correlação com TRT e o componente físico do SF-12. Conclusão: FEIDTs são potencialmente deletérias à qualidade de vida dos pacientes 120 dias após o tratamento inicial. TRT é significativamente maior para pacientes mais jovens, sem história de infecção e que conseguem correr na avaliação da condição de marcha..

Magnetic resonance imaging evaluation of common peroneal nerve injury in acute and subacute posterolateral corner lesion: a retrospective study.

OBJECTIVE: To evaluate qualitative and quantitative magnetic resonance imaging (MRI) criteria for injury of the common peroneal nerve (CPN) in patients with acute or subacute injuries in the posterolateral corner (PLC) of the knee, as well as to evaluate the reproducibility of MRI evaluation of CPN alterations. MATERIALS AND METHODS: This was a retrospective study of 38 consecutive patients submitted to MRI and diagnosed with acute or subacute injury to the PLC of the knee (patient group) and 38 patients with normal MRI results (control group). Two musculoskeletal radiologists (designated radiologist A and radiologist B, respectively) evaluated the images. Nerve injury was classified as neurapraxia, axonotmesis, or neurotmesis. Signal strength was measured at the CPN, the tibial nerve (TN), and a superficial vein (SV). The CPN/TN and CPN/SV signal ratios were calculated. The status of each PLC structure, including the popliteal tendon, arcuate ligament, lateral collateral ligament, and biceps tendon, was classified as normal, partially torn, or completely torn, as was that of the cruciate ligaments. For the semiquantitative analysis of interobserver agreement, the kappa statistic was calculated, whereas a receiver operating characteristic (ROC) curve was used for the quantitative analysis. RESULTS: In the patient group, radiologist A found CPN abnormalities in 15 cases (39.4%)-neurapraxia in eight and axonotmesis in seven-whereas radiologist B found CPN abnormalities in 14 (36.8%)-neurapraxia in nine and axonotmesis in five. The kappa statistic showed excellent interobserver agreement. In the control group, the CPN/TN signal ratio ranged from 0.63 to 1.1 and the CPN/SV signal ratio ranged from 0.16 to 0.41, compared with 1.30-4.02 and 0.27-1.08, respectively, in the patient group. The ROC curve analysis demonstrated that the CPN/TN signal ratio at a cutoff value of 1.39 had high (93.3%) specificity for the identification of nerve damage, compared with 81.3% for the CPN/SV signal ratio at a cutoff value of 0.41. CONCLUSION: CPN alterations are common in patients with PLC injury detected on MRI, and the level of interobserver agreement for such alterations was excellent. Calculating the CPN/TN and CPN/SV signal ratios may increase diagnostic confidence. We recommend systematic analysis of the CPN in cases of PLC injury.

OBJETIVO: Avaliar critérios de identificação de lesão no nervo fibular comum (NFC) por ressonância magnética (RM) em pacientes com lesão aguda e subaguda no canto posterolateral (CPL) e avaliar a reprodutibilidade na identificação de alterações do NFC. MATERIAIS E MÉTODOS: Foram incluídos, retrospectivamente, 38 pacientes consecutivos submetidos a RM e com diagnóstico de lesão aguda ou subaguda no CPL do joelho, constituindo o grupo de pacientes. Outros 38 pacientes com RM normal foram utilizados como grupo controle. Dois radiologistas musculoesqueléticos (A e B) analisaram as imagens. A lesão neural foi classificada em neuropraxia, axoniotmese ou neurotmese. Foi medida a intensidade do sinal no NFC, no nervo tibial (NT) e em uma veia superficial (VS), e calculadas as razões de sinal NFC/NT e NFC/VS. Estruturas do CPL, incluindo tendão poplíteo, ligamento arqueado, ligamento colateral lateral e tendão do bíceps, foram classificadas como normal, rotura parcial ou rotura completa. Os ligamentos cruzados também foram avaliados segundo os mesmos critérios. O teste kappa foi utilizado para avaliar a concordância interobservador para as classificações semiquantitativas. Curva ROC foi utilizada para análise quantitativa. RESULTADOS: O radiologista A encontrou alterações no NFC em 15 casos (39,4%): 8 neuropraxias, 7 axoniotmeses e nenhuma neurotmese. O radiologista B encontrou alterações no NFC em 14 casos (36,8%): 9 neuropraxias, 5 axoniotmeses e nenhuma neurotmese. O teste kappa mostrou alta concordância interobservador. No grupo controle, a razão NFC/NT variou entre 0,63-1,1 e a razão NFC/VS variou entre 0,16-0,41. Para o grupo de pacientes, a razão NFC/NT variou entre 1,30-4,02 e a razão NFC/VS variou entre 0,27-1,08. A análise com curva ROC demonstrou alta especificidade (93,3%) com relação à razão NFC/NT, usando um valor de corte de 1,39. Houve boa especificidade (81,3%) para a razão NFC/VS usando um valor de corte de 0,41. CONCLUSÃO: As alterações do NFC são detectadas com frequência nas lesões do CPL nas imagens de RM, com concordância interobservadores quase perfeita. Usando as razões de intensidade de sinal entre o NFC e o NT e entre o NFC e a VS, aumenta a confiança no diagnóstico. Recomendamos a análise sistemática do NFC nos casos de lesão do CPL.

Magnetic resonance imaging evaluation of common peroneal nerve injury in acute and subacute posterolateral corner lesion: a retrospective study / Estudo retrospectivo das alterações do nervo fibular comum identificadas por ressonância magnética nas lesões agudas e subagudas do canto posterolateral do joelho

Abstract Objective: To evaluate qualitative and quantitative magnetic resonance imaging (MRI) criteria for injury of the common peroneal nerve (CPN) in patients with acute or subacute injuries in the posterolateral corner (PLC) of the knee, as well as to evaluate the reproducibility of MRI evaluation of CPN alterations. Materials and Methods: This was a retrospective study of 38 consecutive patients submitted to MRI and diagnosed with acute or subacute injury to the PLC of the knee (patient group) and 38 patients with normal MRI results (control group). Two musculoskeletal radiologists (designated radiologist A and radiologist B, respectively) evaluated the images. Nerve injury was classified as neurapraxia, axonotmesis, or neurotmesis. Signal strength was measured at the CPN, the tibial nerve (TN), and a superficial vein (SV). The CPN/TN and CPN/SV signal ratios were calculated. The status of each PLC structure, including the popliteal tendon, arcuate ligament, lateral collateral ligament, and biceps tendon, was classified as normal, partially torn, or completely torn, as was that of the cruciate ligaments. For the semiquantitative analysis of interobserver agreement, the kappa statistic was calculated, whereas a receiver operating characteristic (ROC) curve was used for the quantitative analysis. Results: In the patient group, radiologist A found CPN abnormalities in 15 cases (39.4%)-neurapraxia in eight and axonotmesis in seven-whereas radiologist B found CPN abnormalities in 14 (36.8%)-neurapraxia in nine and axonotmesis in five. The kappa statistic showed excellent interobserver agreement. In the control group, the CPN/TN signal ratio ranged from 0.63 to 1.1 and the CPN/SV signal ratio ranged from 0.16 to 0.41, compared with 1.30-4.02 and 0.27-1.08, respectively, in the patient group. The ROC curve analysis demonstrated that the CPN/TN signal ratio at a cutoff value of 1.39 had high (93.3%) specificity for the identification of nerve damage, compared with 81.3% for the CPN/SV signal ratio at a cutoff value of 0.41. Conclusion: CPN alterations are common in patients with PLC injury detected on MRI, and the level of interobserver agreement for such alterations was excellent. Calculating the CPN/TN and CPN/SV signal ratios may increase diagnostic confidence. We recommend systematic analysis of the CPN in cases of PLC injury.

Resumo Objetivo: Avaliar critérios de identificação de lesão no nervo fibular comum (NFC) por ressonância magnética (RM) em pacientes com lesão aguda e subaguda no canto posterolateral (CPL) e avaliar a reprodutibilidade na identificação de alterações do NFC. Materiais e Métodos: Foram incluídos, retrospectivamente, 38 pacientes consecutivos submetidos a RM e com diagnóstico de lesão aguda ou subaguda no CPL do joelho, constituindo o grupo de pacientes. Outros 38 pacientes com RM normal foram utilizados como grupo controle. Dois radiologistas musculoesqueléticos (A e B) analisaram as imagens. A lesão neural foi classificada em neuropraxia, axoniotmese ou neurotmese. Foi medida a intensidade do sinal no NFC, no nervo tibial (NT) e em uma veia superficial (VS), e calculadas as razões de sinal NFC/NT e NFC/VS. Estruturas do CPL, incluindo tendão poplíteo, ligamento arqueado, ligamento colateral lateral e tendão do bíceps, foram classificadas como normal, rotura parcial ou rotura completa. Os ligamentos cruzados também foram avaliados segundo os mesmos critérios. O teste kappa foi utilizado para avaliar a concordância interobservador para as classificações semiquantitativas. Curva ROC foi utilizada para análise quantitativa. Resultados: O radiologista A encontrou alterações no NFC em 15 casos (39,4%): 8 neuropraxias, 7 axoniotmeses e nenhuma neurotmese. O radiologista B encontrou alterações no NFC em 14 casos (36,8%): 9 neuropraxias, 5 axoniotmeses e nenhuma neurotmese. O teste kappa mostrou alta concordância interobservador. No grupo controle, a razão NFC/NT variou entre 0,63-1,1 e a razão NFC/VS variou entre 0,16-0,41. Para o grupo de pacientes, a razão NFC/NT variou entre 1,30-4,02 e a razão NFC/VS variou entre 0,27-1,08. A análise com curva ROC demonstrou alta especificidade (93,3%) com relação à razão NFC/NT, usando um valor de corte de 1,39. Houve boa especificidade (81,3%) para a razão NFC/VS usando um valor de corte de 0,41. Conclusão: As alterações do NFC são detectadas com frequência nas lesões do CPL nas imagens de RM, com concordância interobservadores quase perfeita. Usando as razões de intensidade de sinal entre o NFC e o NT e entre o NFC e a VS, aumenta a confiança no diagnóstico. Recomendamos a análise sistemática do NFC nos casos de lesão do CPL.

Ipsilateral femoral neck and shaft fractures. When do we need further image screening of the hip?

OBJECTIVE: The objective of the present study was to identify patterns of femoral diaphyseal fractures which are associated with fractures of the ipsilateral femoral neck according to the AO classification. We propose an algorithm of investigation based on plain radiographs, recognizing cases that need additional screening with computed tomography. PATIENTS AND METHODS: This observational retrospective study included patients with combined diaphyseal and femoral neck fractures. These patients were retrieved from a total of 1398 patients with the diagnoses of diaphyseal fractures of the femur, who were admitted to our hospital for surgical treatment between January 2009 and October 2019. All included cases had both fractures analyzed for their geometry and were classified according to the AO Classification, seeking to find a correlation between the types of fractures. RESULTS: Sixteen diaphyseal fractures associated with ipsilateral neck fractures were detected during the period. The distribution of the diaphyseal fractures according to the AO Classification was as follows: 5 of type A3 (31,2%) 6 type B2 (37.5%), 1 type B3 (6,2%), 2 type C2 (12,5%) and 2 type C3 (12,5%). One A2 femoral fracture occurred during the surgical procedure. No type A1 fractures were detected. CONCLUSION: The patterns of high-energy diaphyseal fractures (A3, B and C) have a higher prevalence of associated ipsilateral neck fractures. Our study suggests that routine additional methods of image investigation of femoral neck fractures may be unnecessary for diaphyseal fractures type A1 and A2.

REPLACEMENT VERSUS NON-REPLACEMENT OF THE PATELLAR JOINT SURFACE IN TOTAL KNEE ARTHROPLASTY.

OBJECTIVE: This study addresses functional data, pain, and the reoperation rate in patients undergoing primary total knee arthroplasty (TKA) during which the patella was or was not replaced. METHODS: Fifty-three knees were included, 18 with the patella replaced and 35 with the patella not replaced. WOMAC and SF-12 scores and knee pain were analyzed preoperatively and 3, 6, and 12 months after TKA. The reoperation rate was also evaluated. RESULTS: Both groups presented significant improvement in WOMAC score and pain at all postoperative follow-up appointments. There was no significant difference between the groups in all evaluated variables. Two subjects in the group did not undergo patellar replacement due to complaints of anterior knee pain after arthroplasty. There was no difference between the groups in relation to the reoperation rate. CONCLUSION: Patients receiving patellar replacement during TKA did exhibit significant differences in the rate of reoperation, function, or pain when compared to patients in which the patella was replaced. Level of Evidence III; Cohort study.

OBJETIVO: Este estudo confronta dados funcionais, dor e taxa de re-operação de pacientes submetidos à ATJ primária, que substituíram e que não substituíram a patela. MÉTODOS: 53 joelhos, sendo 18 com a patela substituída e 35 com a patela não substituída. Womac, SF-12 e dor no joelho foram analisados no pré-operatório e após 3, 6 e 12 meses da ATJ. A taxa de re-operação também foi avaliada. RESULTADOS: Ambos os grupos apresentam melhora significativa no questionário Womac e dor em todos os seguimentos pós-operatórios. Não houve diferença significativa entre os grupos em todas as variáveis avaliadas. Dois sujeitos no grupo NÃO foram submetidos a substituição da patela devido a queixas de dor anterior no joelho após a artroplastia. Não houve diferença entre os grupos em relação a taxa de re-operação. CONCLUSÃO: Pacientes submetidos a substituição da patela na ATJ não obtiveram diferença significativa quanto a taxa de reoperação, função e dor quando comparados aqueles que não substituíram. Nível de evidência III; Estudo Coorte.

Algorithmic treatment of Busch-Hoffa distal femur fractures: A technical note based on a modified Letenneur classification.

Treatment of distal femur fractures in the coronal plane can be challenging. Depending on fracture line orientation, topography and associated comminution, decision-making regarding approach and fixation is not straightforward and can result in complications. Therefore, treatment of coronal plane distal femur fractures (Busch-Hoffa fractures) should be approached in a systematic manner, leading to efficient planning and operative execution. Here, we offer a proposed treatment algorithm, guiding treatment, approach and fixation based on the modified Letenneur classification of coronal plane distal femur fractures.

The relationship between performance on the modified star excursion balance test and the knee muscle strength before and after anterior cruciate ligament reconstruction.

OBJECTIVES: The objective of this study was to evaluate the dynamic balance of the injured and uninjured limb before and after the anterior cruciate ligament (ACL) reconstruction and compare with the control group. STUDY DESIGN: Prospective longitudinal. SETTING: Biomechanics laboratory. PARTICIPANTS: Participants are 24 males (mean age, 27.5 years) with unilateral ACL injury (ACLG) and 24 male healthy volunteers (CG). MAIN OUTCOMES MEASURES: The modified star excursion balance test (SEBT) and isokinetic knee extensor and flexor strength were applied in the ACLG preoperatively and after surgery. The dominant limb of CG was evaluated at a single time. RESULTS: There was no difference between the injured and the uninjured limb of the ACLG (P > 0.05) before and after surgery. Preoperatively, both ACLG limbs had a significantly lower reach distance in posteromedial (PM) and posterolateral (PL) directions and in composite reach (CR) score compared to the control group (P < 0.001). Postoperatively, no significant differences were found between ACLG and CG (P > 0.05). There was a positive correlation between preoperative PL (0.59) and CR (0.51), postoperative PM (0.36), PL (0.36) and CR (0.46) with flexor strength at 12 months after surgery. CONCLUSION: Patients with ACL injury presented a worse performance in the SEBT in the preoperative period compared to the control group. After ligament reconstruction, the performance in the SEBT became equivalent to that of the control group. The strong correlation between flexor strength and posterior directions of the injured limb demonstrates the importance of the knee flexor muscles in the neuromuscular control of patients submitted to ACL reconstruction.

Replacement versus non-replacement of the patellar joint surface in total knee arthroplasty / Substituição versus não substituição da superfície articular da patela na artroplastia total de joelho

ABSTRACT Objective This study addresses functional data, pain, and the reoperation rate in patients undergoing primary total knee arthroplasty (TKA) during which the patella was or was not replaced. Methods Fifty-three knees were included, 18 with the patella replaced and 35 with the patella not replaced. WOMAC and SF-12 scores and knee pain were analyzed preoperatively and 3, 6, and 12 months after TKA. The reoperation rate was also evaluated. Results Both groups presented significant improvement in WOMAC score and pain at all postoperative follow-up appointments. There was no significant difference between the groups in all evaluated variables. Two subjects in the group did not undergo patellar replacement due to complaints of anterior knee pain after arthroplasty. There was no difference between the groups in relation to the reoperation rate. Conclusion Patients receiving patellar replacement during TKA did exhibit significant differences in the rate of reoperation, function, or pain when compared to patients in which the patella was replaced. Level of Evidence III; Cohort study.

RESUMO Objetivo Este estudo confronta dados funcionais, dor e taxa de re-operação de pacientes submetidos à ATJ primária, que substituíram e que não substituíram a patela. Métodos 53 joelhos, sendo 18 com a patela substituída e 35 com a patela não substituída. Womac, SF-12 e dor no joelho foram analisados no pré-operatório e após 3, 6 e 12 meses da ATJ. A taxa de re-operação também foi avaliada. Resultados Ambos os grupos apresentam melhora significativa no questionário Womac e dor em todos os seguimentos pós-operatórios. Não houve diferença significativa entre os grupos em todas as variáveis avaliadas. Dois sujeitos no grupo NÃO foram submetidos a substituição da patela devido a queixas de dor anterior no joelho após a artroplastia. Não houve diferença entre os grupos em relação a taxa de re-operação. Conclusão Pacientes submetidos a substituição da patela na ATJ não obtiveram diferença significativa quanto a taxa de reoperação, função e dor quando comparados aqueles que não substituíram. Nível de evidência III; Estudo Coorte.

The Impact of Computed Tomography on Decision Making in Tibial Plateau Fractures.

Schatzker introduced one of the most used classification systems for tibial plateau fractures, based on plain radiographs. Computed tomography brought to attention the importance of coronal plane-oriented fractures. The goal of our study was to determine if the addition of computed tomography would affect the decision making of surgeons who usually use the Schatzker classification to assess tibial plateau fractures. Image studies of 70 patients who sustained tibial plateau fractures were uploaded to a dedicated homepage. Every patient was linked to a folder which contained two radiographic projections (anteroposterior and lateral), three interactive videos of computed tomography (axial, sagittal, and coronal), and eight pictures depicting tridimensional reconstructions of the tibial plateau. Ten attending orthopaedic surgeons, who were blinded to the cases, were granted access to the homepage and assessed each set of images in two different rounds, separated to each other by an interval of 2 weeks. Each case was evaluated in three steps, where surgeons had access, respectively to radiographs, two-dimensional videos of computed tomography, and three-dimensional reconstruction images. After every step, surgeons were asked to present how would they classify the case using the Schatzker system and which surgical approaches would be appropriate. We evaluated the inter- and intraobserver reliability of the Schatzker classification using the Kappa concordance coefficient, as well as the impact of computed tomography in the decision making regarding the surgical approach for each case, by using the chi-square test and likelihood ratio. The interobserver concordance kappa coefficients after each assessment step were, respectively, 0.58, 0.62, and 0.64. For the intraobserver analysis, the coefficients were, respectively, 0.76, 0.75, and 0.78. Computed tomography changed the surgical approach selection for the types II, V, and VI of Schatzker (p < 0.01). The addition of computed tomography scans to plain radiographs improved the interobserver reliability of Schatzker classification. Computed tomography had a statistically significant impact in the selection of surgical approaches for the lateral tibial plateau.

Tibial Onlay Posterior Cruciate Ligament Reconstruction: Surgical Technique and Results.

The posterior cruciate ligament (PCL) is a fundamental structure in knee kinematics. PCL tears may lead to adverse consequences, such as impaired functional performance and an increased risk of osteoarthritis. Although surgical treatment is a well-established option for the patients of PCL rupture, many surgeons opt for conservative treatment because of the lack of consensus in the orthopedic literature concerning the best surgical method with less risk of iatrogenic lesions to the neurovascular structures in the popliteal region. Here, we describe an onlay technique for PCL reconstruction, which has some advantages over the traditional transtibial and over inlay techniques. The technique described in this study avoids the "killer angle"-frequently considered the cause of laxity of the reconstructed ligament-while simultaneously permitting safe retraction of the neurovascular structures without the need for a change in the patient's position. This technique has been used at our institution for approximately 10 years with very satisfactory results. The aim of this study is to describe the technique and perform a retrospective evaluation of the results of a case series.

A Simple Technique to Prevent Early or Late EndoButton Deployment in Anterior Cruciate Ligament Reconstructions: A Technical Note.

The use of suspensory graft fixation methods in arthroscopic reconstruction of the anterior cruciate ligament has become increasingly popular with the more frequent use of tendon grafts and anatomical techniques involving the creation of bone tunnels. An important technical step to ensure adequate fixation of the graft when using EndoButton-type implants, particularly in the femur, involves flipping the EndoButton plate at the correct length to avoid performing this maneuver before the appropriate time or leaving soft tissue between the plate and lateral cortex of the femur. In the present study, we describe a simple arthroscopic technique for indicating the correct time to flip/deploy the EndoButton plate.