ABSTRACT Reconstructive surgery with endoprostheses is the chosen method for treating bone malignancies. Postoperative infections are frequent complications, and their treatment involves prolonged hospital stays and antibiotic therapy. Among the advancements aimed at reducing the rate of postoperative infection, the use of incisional negative pressure therapy (iNPT) has shown promising results, with no reports in the literature regarding its use in patients with such conditions. Objective: To evaluate the effectiveness of iNPT in reducing postoperative complications in surgeries for resection of bone tumors associated with modular endoprosthesis reconstruction. Methods: Retrospective case series of 16 patients diagnosed with osteosarcoma, who underwent resection and reconstruction with endoprosthesis associated with iNPT during the postoperative period. Follow-up was performed for a period of six months, and the evaluated outcomes were the incidence of postoperative infection and complications of the surgical wound. Results: The use of iNPT for a postoperative period of seven days resulted in only three (18.7%) cases of postoperative infection. No cases of wound dehiscence, seroma formation, or hematoma at the surgical site were observed. Conclusion: The rate of surgical wound complications in our case series is lower than that reported in most of the literature, and iNPT appears to be an efficient way to reduce the rate of local complications in reconstructive surgeries with endoprosthesis after resection of bone malignancies. Level of Evidence III, Retrospective Study.

RESUMO A cirurgia reconstrutiva com endopróteses é o método escolhido no tratamento de malignidades ósseas. As infecções pós-operatórias são complicações frequentes, e seu tratamento envolve internações e antibioticoterapia prolongadas. Entre os avanços que visam reduzir a taxa de infecção pós-operatória, o uso da terapia com pressão negativa incisional (TPNi) vem mostrando resultados promissores, não havendo relatos na literatura de seu emprego em pacientes com tal quadro. Objetivo: Avaliar a eficácia da TPNi em reduzir complicações pós-operatórias em cirurgias de ressecção de tumores ósseos associadas à reconstrução com endopróteses modulares. Métodos: Série de casos retrospectiva de 16 pacientes diagnosticados com osteossarcoma, submetidos à ressecção e reconstrução com endoprótese associada à TPNi durante o pós-operatório. Foi realizado seguimento por um período de seis meses e os desfechos avaliados foram incidência de infecção pós-operatória e complicações da ferida operatória. Resultados: O uso da TPNi por um período pós-operatório de sete dias resultou em apenas três (18,7%) casos de infecção pós-operatória. Não foram observados casos em que ocorreu deiscência da ferida operatória, formação de seromas ou hematomas no sítio cirúrgico. Conclusão: A taxa de complicações de ferida operatória em nossa série de casos é menor que a da maior parte da literatura, e a TPNi parece ser uma forma eficiente de reduzir a taxa de complicações locais em cirurgias reconstrutivas com endoprótese após ressecção de malignidades ósseas. Nível de Evidência III, Estudo Retrospectivo.

RESUMO Objetivos: O leiomiossarcoma primário do osso (LPO) é um tumor ósseo maligno raro, considerado uma variante do sarcoma de células fusiformes (SCF). O objetivo deste estudo foi fazer uma análise clínico-patológica e dos fatores de prognóstico dos pacientes diagnosticados com LPO tratados em uma instituição única. Métodos: Foram analisados retrospectivamente os prontuários de 22 pacientes com diagnóstico confirmado de LPO. Os dados coletados foram: idade, sexo, tamanho e localização do tumor, grau histológico, estádio da doença e as características histopatológicas. A média de idade foi 45,5 anos (de 17 a 73 a). A localização foi: membro superior (27,3%), membro inferior (68,2%) e pelve (4,5%). Os pacientes apresentaram alto grau em 90,9% dos relatos. As margens foram livres em 77,3% dos casos. Os relatos histológicos descrevem células sarcomatosas finas e compridas, arranjadas em fascículos, com aumento da vascularização e sem produção de matriz osteoide ou condral. No estudo imuno-histoquímico, a actina do músculo liso e a desmina foram positivas em todos os casos. Resultados: O tempo médio de seguimento foi 73,5 meses (de 5,3 a 331,1 m). Dos pacientes, 22,7% apresentaram recorrência local (RL). Metástase à distância (MD) foi reportada em 9 (40,9%) pacientes. O único local de MD foi o pulmão. O tempo médio de sobrevida em 5 anos foi de 59,1%. Os fatores preditivos de sobrevida global foram: RL e MD. Conclusão: O LPO é um tumor ósseo maligno extremamente raro que tem uma taxa maior de MD, com uma sobrevida global similar aos outros sarcomas ósseos. Nível de Evidencia IV, Série de Casos.

ABSTRACT Objective: Primary leiomyosarcoma of bone (PLB) is a rare type of malignant bone tumor considered as a variant of the spindle cell sarcomas (SCS). The objective of this study was to analyze the clinicopathologic and the prognostic factors of patients with PLB treated at a single institution. Methods: We retrospectively reviewed the records of 22 patients with pathologically confirmed PLB. The data collected were: age, sex, tumor size and location, grade and stage of the disease and histopathologic features. Mean age was 45.5 years (range, 17 to 73 y). Location was: upper limb (27.3%), lower limb (68.2%) and pelvis (4.5%). Patients had high grade in 90.9% of the reports. Margins were negative in 77.3% of the cases. Histological reports describe spindly sarcomatous cells arranged in fascicles with increased vascular formation without osteoid or chondroid matrix production. On immunohistochemistry, smooth muscle actin and desmin where positive in all cases. Results: Mean follow-up time was 73.5 months (range, 5.3 to 331.1 m). We found 22.7% of local recurrence (LR). Distant metastasis (DM) was reported in 9 (40.9%) patients. Lung metastasis was the only DM affected site. Overall survival (OS) rate in 5 years was 59.1%. Predictors of OS were LR and DM. Conclusions: PLB is an extremely rare malignant bone tumor that has a higher rate of DM and similar OS prognosis compared with other bone sarcomas. Level of Evidence IV, Case Series.

RESUMO Objetivos: O mixofibrossarcoma (MFS) é um sarcoma de partes moles (SPM) frequente em idosos, que afeta os membros. O objetivo foi analisar os fatores prognósticos e os desfechos dos pacientes diagnosticados com MFS em uma única instituição. Métodos: Foram analisados retrospectivamente prontuários de 75 pacientes com MFS. Comparamos idade, sexo, tamanho e localização do tumor, grau histológico e o estádio da doença. A media da idade foi 49,7 anos (faixa de 1 a 88 anos). A localização foi: membro superior (25,4%), membro inferior (66,6%) e pelve (8%). Dos tumores, 46,7% foram de alto grau. As margens foram negativas em 76%. A análise de regressão de Cox bivariada foi usada para determinar as associações entre os fatores clínicos e de tratamento com a recorrência local (RL). Resultados: A media do acompanhamento foi 30,7 meses (faixa de 1,8 a 383,8 meses) e 26,7% dos pacientes tiveram RL. Metástases a distância (MD) foram relatadas em 27 (36%) pacientes. O local mais comum de MD foi o pulmão (92,6%). A sobrevida geral (SG) com metástase foi 21,2 meses (faixa de 4,8 a 114,8 meses). Os fatores preditivos de SG foram grau, RL (razão de probabilidades [HR] 5,13, intervalo de confiança de 95%, 2,15-12,24, P < 0,001) e MD (HR 540,97, intervalo de confiança de 95%, 5,04-58.112,03, P < 0.001). Conclusões: Grau histológico do tumor, margens comprometidas, RL e MD foram fatores preditivos de pior prognóstico da SG. Nível de Evidencia IV, Série de Casos.

ABSTRACT Objective: Myxofibrosarcoma (MFS) is a common soft tissue sarcoma (STS) that affects the extremities in elderly patients. The objective was to analyze the prognostic factors and outcomes of patients with MFS treated at a single institution. Methods: We retrospectively reviewed the records of 75 patients with MFS. We compared age, sex, tumor size and location, grade and stage of the disease. Median age was 49.7 years (range, 1 to 88 y). Location: upper extremity (25.4%), lower extremity (66.6%) and pelvis (8%). Patients had high-grade tumors in 46.7% of the reports. Margins were negative in 76% of the cases. Bivariate Cox regression analysis was used to determine associations between clinical and treatment factors with local recurrence (LR). Results: Median follow-up time was 30.7 months (range, 1.8 to 383.8 m). We found 26.7% of LR. Distant metastasis (DM) was reported in 27 (36%) patients. Lung was the most common site of DM, reported in 92.6% of patients. Overall survival (OS) with metastasis was 21.2 months (range, 4.8 to 114.8 m). Predictors of OS were grade, LR (hazard ratio [HR] 5.13, 95% confidence interval, 2.15-12.24, P <0.001), and DM (HR 540.97, 95% confidence interval, 5.04-58112.03, P< 0.001). Conclusions: Tumor grade, LR, positive margins and DM were significant predictors of poor OS prognosis. Level of Evidence IV, Case Series.

ABSTRACT Objective: To study the relationship between the pre and post chemotherapy (CT) serum levels of alkaline phosphatase (AP) and lactate dehydrogenase (LDH), and the percentage of tumor necrosis (TN) found in specimens after the pre surgical CT in patients with osteosarcoma. Methods: Series of cases with retrospective evaluation of patients diagnosed with osteosarcoma. Participants were divided into two groups according to serum values of both enzymes. The values of AP and LDH were obtained before and after preoperative CT. The percentage of tumor necrosis (TN) of surgical specimens of each patient was also included. Results: One hundred and thirty seven medical records were included from 1990 to 2013. Both the AP as LDH decreased in the patients studied, being the higher in pre CT than post CT. The average LHD decrease was 795.12U/L and AP decrease was 437.40 U/L. The average TN was 34.10 %. There was no statistically significant correlation between the serums values and the percentage of tumoral necrosis. Conclusion: The serum levels values of AP and LDH are not good predictors for the chemotherapy-induced necrosis in patients with osteosarcoma. Level of Evidence IV, Case Series.

OBJECTIVE: To compare the functional outcome of patients with and without arthrosis, and to determine whether the development of arthrosis is related to the distance of the tumor from the subchondral bone. METHODS: Forty six patients treated for Giant-cell tumor (GCT) between 1975 and 1999 met inclusion criteria. GCT was diagnosed by percutaneous biopsy and confirmed after resection, in all cases. Campanacci's and Kellgren's classification, the distance of the cement to the articular surface and MSTS score were obtained throughout the sample. RESULTS: The distance of the cement to the subchondral bone was associated with greater risk of developing arthrosis, but there was no difference in MSTS scores between patients with or without arthrosis. CONCLUSION: We found that the distance from the cement to the subchondral bone has a prognostic value regarding future arthrosis, but it does not impact on the functional outcome. Level of Evidence IV, Therapeutic Study

OBJECTIVE: The aim of this study was to report a single center experience of organ and tissue transplantation INTRODUCTION: This is the first report of organ and tissue transplantation at the Hospital das Clínicas of the University of Sao Paulo Medical School. METHODS: We collected data from each type of organ transplantation from 2002 to 2007. The data collected were patient characteristics and actuarial survival Kaplan-Meier curves at 30 days, one year, and five years RESULTS: There were a total of 3,321 transplants at our institution and the 5-year survival curve ranged from 53% to 88%. CONCLUSION: This report shows that solid organ and tissue transplants are feasible within the institution and allow us to expect that the quality of transplantation will improve in the future.

OBJETIVO: Verificar se havia risco de contaminação por células neoplásicas no trajeto da biópsia e estudar as alterações histológicas locais. MÉTODOS: Realizou-se um estudo prospectivo com trajetos de biópsias de pacientes operados por tumores musculoesqueléticos malignos no Instituto de Ortopedia e Traumatologia da Faculdade de Medicina da Universidade de São Paulo no período de abril de 2006 a abril de 2007. Foram estudados por histopatologia 25 casos. RESULTADOS: Houve implante de células neoplásicas em 32% dos trajetos. As alterações histológicas mais comuns nos casos positivos foram classificadas como: fibrose acentuada, componente inflamatório leve e neovascularização acentuada. CONCLUSÃO: Sugerimos a ressecção tradicional oncológica do trajeto junto com a peça.

OBJECTIVE: To investigate whether there is any risk of seeding by neoplasic cells along biopsy tracks and to study local histological abnormalities. METHODS: This was a prospective study on biopsy tracks in patients who underwent operations due to malignant musculoskeletal tumors between April 2006 and April 2007. RESULTS: Neoplasic cell implantation occurred in 32% of the tracks. The most common histological abnormalities in positive cases were classified as severe fibrosis, mild inflammatory component and severe neovascularization. CONCLUSION: We suggest that traditional oncological resection of the track should be carried out together with excision of the specimen.

OBJECTIVE: The objective of this study was to investigate MDM2 (murine double minute 2) protein expression and evaluate its relationship with some anatomical and pathological aspects, aiming also to identify prognostic factors concerning local recurrence-free survival, metastasis-free survival and overall survival in patients with primary liposarcomas of the extremities. MATERIALS AND METHODS: Of 50 patients with primary liposarcomas of the extremities admitted to a Reference Service, between 1968 and 2004, 25 were enrolled in the study, following eligibility and exclusion criteria. RESULTS: The adverse factors that influenced the risk for local recurrence in the univariant analysis included male sex (P = 0.023), pleomorphic histological subtype (P = 0.027), and high histological grade (P = 0.007). Concerning metastasis-free survival, age less than 50 years (P = 0.040), male sex (P = 0.040), pleomorphic subtype (P < 0.001), and high histological grade (P = 0.003) had a worse prognosis. Adverse factors for overall survival were age under 50 years (P = 0.040), male sex (P = 0.040), pleomorphic subtype (P < 0.001), and high histological grade (P = 0.003). CONCLUSIONS: There was no correlation between immunohistochemically observed MDM2 protein expressions and the anatomical and pathological variables studied. The immunohistochemical expression of MDM2 protein was not considered to have a prognostic value for any of the surviving patients in this study (local recurrence-free survival, metastasis-free survival, or overall survival). The immunoexpression of MDM2 protein was a frequent event in the different subtypes of liposarcomas.

OBJETIVO: Avaliar casos de sarcoma sinovial não-metastático das extremidades no que se refere a fatores prognósticos, e propor um sistema histológico de pontuação com significado prognóstico. MATERIAL E MÉTODO: Vinte casos (14 do sexo feminino e 6 do sexo masculino) de sarcomas sinoviais não-metastáticos das extremidades tratados entre 1985 e 1998 no departamento de Ortopedia foram avaliados retrospectivamente no que se refere a fatores prognósticos e está sendo proposto um sistema de pontuação histológico com significado prognóstico. RESULTADOS: A média dos períodos de acompanhamento foi 48,4 meses (mínimo 16 meses, máximo 116). Houve recorrência localizada em 3 casos (15%), sendo a margem cirúrgica microscópica o único fator prognóstico identificado. Sete pacientes (35%) morreram da doença, todos em período pós-operatório médio de 31,7 meses (mínimo 16 meses, máximo 53), todos com metástase pulmonar ou cerebral. A sobrevida foi de 65% em 48,4 meses de acompanhamento. CONCLUSÃO: Os fatores prognósticos desfavoráveis identificados referentes à sobrevida foram: grau histológico alto, tumores proximais de joelho ou cotovelo e necrose espontânea de tumor acima de 25%. Neste estudo, a recorrência localizada não influiu na sobrevida. Parece que a presença de mastócitos influi positivamente na sobrevida, porém não obtivemos significado estatístico (p=0,07). O resultado oncológico e funcional foi bom em seis casos (30%), regular em sete (35%) e insatisfatório em sete (35%).

PURPOSE: To evaluate 20 cases of nonmetastatic synovial sarcoma of the extremities regarding prognostic factors, and to propose a histologic grading system with prognostic significance. METHODS: The cases of 20 patients (14 females and 6 males) with nonmetastatic synovial sarcomas of the extremities treated between 1985 and 1998, were retrospectively evaluated regarding prognostic factors. A histologic grading system with prognostic significance is proposed. RESULTS: The mean follow-up period was 48.4 months (range, 16-116 months). There was local recurrence in 3 cases (15%), microscopic surgical margin being the only prognostic factor identified. Seven patients (35%) died of the disease in a mean postoperative period of 31.7 months (range, 16-53 months), all with pulmonary or brain metastasis. The survival rate was 65% in 48.4 months of follow-up. CONCLUSION: The unfavorable prognostic factors identified regarding survival were high histologic grade, tumors proximal to the knee or elbow, and spontaneous tumor necrosis over 25%. Local recurrence did not have influence on survival in this study. The presence of mast cells appears to have a positive influence on survival, although statistical significance was not reached (P = 0.07). The oncologic and functional result was good in 6 cases (30%), regular in 7 (35%), and poor in 7 cases (35%).

OBJETIVO: Avaliar os aspectos clínicos, diagnósticos, fatores de prognóstico e porcentagem de evolução dos casos de plasmocitoma para mieloma múltiplo. MATERIAS E MÉTODOS: Foram levantados 103 prontuários do Hospital das Clínicas da FMUSP, entre os anos de 1950 e 1998. Destes, 73 não foram utilizados por perda de seguimento ou por apresentarem diagnóstico diferente de plasmocitoma. RESULTADOS: Concluímos que a idade dos pacientes que evoluíram para mieloma múltiplo é inferior a dos pacientes que não evoluíram. A média do primeiro grupo foi de 52,3 ± 2,6 anos e a do segundo 62,6 ± 3,4 anos (média ± SEM; p=0,02). Não houve diferença estatística quanto ao sexo. Analisando pacientes com plasmocitoma que evoluiu para mieloma múltiplo, foi observada uma incidência maior de recidivas múltiplas (75%, p=0,049). Em ambos os grupos houve predominância de lesões da coluna vertebral. Não houve nenhuma diferença significativa entre os grupos com relação ao tempo de doença (desde o aparecimento dos sintomas até o diagnóstico) (p=0,20) e à sobrevida (p=0,34). Quanto ao tempo de evolução de plasmocitoma para mieloma, a média foi de 41 meses (DP=38,8), com uma taxa de evolução aproximadamente igual a 57%. CONCLUSÃO: Os pacientes que evoluíram para mieloma múltiplo são mais jovens. Não houve diferença significativa entre os dois grupos quanto ao sexo, tempo de doença e tempo de sobrevida. Em ambos os grupos a localização anatômica mais acometida foi a coluna vertebral. O tempo médio de evolução para mieloma múltiplo foi de 41 meses. Não foi possível calcular os fatores que influem na sobrevida dos pacientes com plasmocitoma e dos pacientes com plasmocitoma que evoluiu para mieloma múltiplo.

PURPOSE: To evaluate the clinical aspects, diagnoses, prognostic factors, and percent progression of plasmacytoma to multiple myeloma. MATERIALS AND METHODS: 103 medical records of patients suspected of plasmacytoma were surveyed covering the period between 1950 and 1998, and 30 were selected for analysis. Patients were classified into 2 groups: patients who did (n = 17) and did not (n = 13) progress to multiple myeloma. Comparative statistics regarding a variety of clincial aspects were developed. RESULTS: Patients who progressed to multiple myeloma were younger than those who did not (52.3 ± 2.6 vs 62.6 ± 3.4 years; mean ± SEM; P = 0.02). There were no significant differences in gender between groups. A higher incidence of multiple recurrence was observed in patients who progressed to multiple myeloma (75%, P = 0.049). Both groups showed a prevalence of vertebral column injuries. No significant differences were found between groups regarding the disease period (from the onset of symptoms until diagnosis) (P = 0.20) and survival (P = 0.34). The average time to progression from plasmacytoma to myeloma was 41 ± 39 months (mean ± SD), and the progression rate was 57%. CONCLUSION: Patients who progressed to multiple myeloma were younger than those who did not. No significant differences were found between groups regarding sex, time from symptom onset to diagnosis, and survival time. In both groups, the most affected anatomic location was the vertebral column, and most affected sex was male. The average time to progression to multiple myeloma was 41 months. It was not possible to determine the factors that influenced the survival of patients with plasmacytoma or for those who progressed to multiple myeloma.

FINALIDADE: Eeste estudo propõ-se a esclarecer as características do osteossarcoma e do sarcoma de Ewing, bem como definir o intervalo de tempo decorrido, no Brasil, entre o início dos sinais e dos sintomas e o diagnóstico definitivo, fornecendo subsídios para um diagnóstico precoce desses tumores. MÉTODO: Alguns aspectos dos diagnósticos clínicos do prontuário de 365 pacientes com menos de 30 anos de idade, portadores de osteossarcoma ou sarcoma de Ewing foram analisados de forma retrospectiva e comparativa, seguindo-se uma análise estatística. RESULTADOS: O tempo entre o início de sinais e sintomas e o diagnóstico foi de 5,25 meses no osteossarcoma e 8,1 meses no sarcoma de Ewing; o sintoma mais freqüente (89,5) nas duas neoplasias foi a dor localizada. CONCLUSÃO: O tempo para o diagnóstico de ambas as neoplasias é maior do que o observado em estatísticas norte-americanas e européias.

OBJECTIVE: The purposes of this study were to describe the early signs and symptoms of osteosarcoma and Ewing's sarcoma, identify symptoms that could be used to help differentiate the two types of tumors, and determine the time elapsed between the onset of signs and symptoms and the definitive diagnosis in our service, providing information and imputus for earlier diagnosis of these tumors. METHODS: A retrospective analysis of the medical dossiers of 365 patients under 30 years of age diagnosed with osteosarcoma or Ewing's sarcoma was performed, and the aspects of the clinical diagnosis were statistically analyzed and compared. RESULTS: The time between the onset of signs and the symptoms was 5.25 months for osteosarcoma and 8.1 months for Ewing's sarcoma, and the most frequent (89.5%) early symptom of osteosarcoma and Ewing's sarcoma was local pain. Symptoms that might aid diagnosis included early local volume increase and the presence of fever. CONCLUSION: The time until diagnosis of both neoplasias was higher than that reported for North America and Europe. Education of the lay public and medical professionals regarding suspicious early signs and symptoms might shorten the delay of diagnosis.

OBJETIVO: O tratamento com curetagem cauterização e metilmetacrilato de lesões ósseas benignas agressivas é o método agora amplamente aceito em quase todos os Centros Ortopédicos Oncológicos, entretanto uma das controvérsias com relação a esta técnica são as possíveis complicações que podem sugerir com o uso do metilmetacrilato fazendo com que alguns autores o removam dos anos depois da cirurgia e os substituam com o enxerto ósseo. O objetivo deste trabalho é apresentar a avaliação radiográfica e funcional de 214 pacientes apresentando lesões ósseas benignas agressivas tratadas com curetagem, cauterização e metilmetacrilato de 1974 a 1998, sendo que alguns deles tem 12 anos de seguimento. Esses pacientes foram avaliados clínica e radiograficamente para a ocorrência de osteoartrose tardia, amplitude de movimento e dor na articulação envolvida. MÉTODO: Este estudo é constituído de 214 pacientes, com seguimento médio de 10,6 anos (2 a 24 anos). Todos os casos correspondem as lesões benignas agressivas. Os pacientes foram avaliados de acordo com Muscolskeletal Tumor Society Score sendo descritas as complicações. RESULTADOS: A avaliação funcional da (MSTS) foi excelente em 166 casos (78%), bom em 26 (12%), regular em 11(5%) e mal 11 (5%). Foram observadas as seguintes complicações: osteoartrose tardia 25 casos (12%), infecção 12(6%), fratura patológica 11(5%) e rescindiva local 19(9%). CONCLUSÃO: Baseado na abordagem clínica não foi observado efeitos deletérios diretamente relacionados ao uso do metilmetacrilato. A avaliação funcional realizada em 1998 (até 24 anos de seguimento) não apresentou alterações significantes quando comparadas a avaliação realizada em 1985.

PURPOSE: Treatment with curettage, cauterization, and methylmethacrylate of aggressive benign bone lesions is a method now widely accepted in most orthopedic oncology centers. However, one of the controversies regarding this technique is the possible complications that may arise from the use of methylmethacrylate, which has caused some authors to remove it 2 years after the surgery and replace it with bone graft. The objective of this paper is to present a functional and radiographic evaluation of 214 patients presenting with aggressive benign bone lesions treated with curettage, cauterization, and methylmethacrylate from 1974 to 1998, with some of them having 24 years of follow-up. These patients were clinically and radiographically evaluated for the incidence of late osteoarthrosis, range of motion, and pain in the involved joint. METHOD: This study comprised 214 patients, with an average follow-up duration of 10.6 years (range: 2 to 24 years. All cases involved aggressive benign lesions. The patients were evaluated according to the Musculoskeletal Tumor Society Score (MSTS) functional evaluation system, and the complications are described. RESULTS: The MSTS functional evaluation was excellent in 166 cases (78%), good in 26 (12%), fair in 11 (5%), and poor in 11 (5%). The following complications were observed: late osteoarthrosis, 25 cases (12%); infection, 12 (6%); pathologic fracture, 11 (5%); and local recurrence, 19 (9%). CONCLUSION: Based on clinical assessment, no significant deleterious effects directly related to the use of methylmethacrylate were observed. The functional evaluation performed in 1998 (up to 24 years of follow-up) did not show significant change when compared to the evaluation performed in 1985.

Os autores analisaram 37 pacientes operados de 1992 a 1998 no Grupo de Oncologia Ortopédica, em que foi utilizada a endoprótese modular de titânio na reconstrução esquelética, após a ressecção segmentar de tumores ósseos. Doze pacientes foram do sexo masculino e 25 do sexo feminino, sendo que a idade variou de 9 a 81 anos, com média de 30 anos. O tempo de seguimento variou de dois a 48 meses, com média de 14 meses. Com relação ao diagnóstico pré-operatório, este foi confirmado pela biópsia em todos os casos e teve a seguinte distribuição: osteossarcoma osteoblástico (14 casos), carcinoma metastático (10), sarcoma de Ewing (4), tumor de células gigantes (4), fibrohistiocitoma maligno (3), condrossarcoma (1) e cisto ósseo aneurismático (1). Nestes foram realizadas onze endopróteses de joelho articulado (total), oito de fêmur proximal com quadril parcial bipolar, oito de úmero proximal parcial, três de fêmur total, duas parciais proximais da tíbia, duas diafisárias de fêmur, duas diafisárias de úmero, e uma proximal do fêmur com quadril total e componente acetabular sem cimento. As complicações relacionadas ao uso da endoprótese foram: infecção (5 casos), luxação (3), soltura de módulo (1) e parestesia do nervo ulnar (1). Utilizamos como critérios clínicos a presença de dor, a mobilidade articular, a estabilidade da reconstrução, as complicações cirúrgicas e oncológicas e a aceitação do paciente. Obtivemos 56,8% de bons resultados, 32,4% de regulares e 10,8% de maus.

We analyzed 37 patients who underwent segmental wide resection of bone tumors and reconstruction with a modular titanium endoprosthesis at the Orthopaedic Oncology Group, between 1992 and 1998. Twelve patients were male and 25 were female, with a mean age of 30 years (9 - 81). The mean follow-up was 14 months (2 - 48). The diagnoses were: osteosarcoma (14 cases), metastatic carcinoma (10), Ewing's sarcoma (4), giant cell tumor (4), malignant fibrous histiocytoma (3), chondrosarcoma (1), and aneurysmal bone cyst (1). Eleven articulated total knee, 8 partial proximal femur with bipolar acetabulum, 8 partial proximal humerus, 3 total femur, 2 partial proximal tibia, 2 diaphyseal femur, 2 diaphyseal humerus, and 1 total proximal femur with cementless acetabulum endoprosthesis implant procedures were done. The complications related to the procedure included: infection (5 cases), dislocation (3), module loosening (1), and ulnar nerve paresthesia (1). We used the following criteria for the clinical evaluation: presence of pain, range of motion, reconstruction stability, surgical and oncologic complications, and patient acceptance. The results were good in 56.8% of the cases, regular in 32.4% and poor in 10.8%.