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OBJETIVO: Analisar a correlação entre os déficits musculares dos extensores e flexores do joelho através do pico de torque isocinético com os testes de salto monopodal, frouxidão ligamentar pós-operatória e questionário de função em indivíduos normais e indivíduos submetidos à reconstrução do LCA com enxerto autólogo do tendão patelar e dos tendões flexores. MÉTODOS: Foram recrutados 60 indivíduos, formando três grupos: 20 indivíduos sem lesões no joelho (grupo GC) e dois grupos de 20 indivíduos submetidos à reconstrução do LCA com tendão patelar (grupo GTP) ou tendões flexores (grupo GTF). RESULTADOS: Os resultados demonstraram correlação significativa entre déficits no pico de torque e testes funcionais no torque extensor nos grupos GTF e GC. Não foram observadas correlações significativas entre frouxidão ligamentar pós-operatória e questionário de Lysholm com os testes de salto e déficits no pico de torque. Em relação à diferença entre os grupos, foi observado que o grupo GTP demonstrou maior déficit do torque extensor, menor pontuação no questionário de Lysholm e maior percentagem dos indivíduos com índice de simetria entre membros (ISM) < 90% em ambos os testes de salto monopodal quando comparado com os demais grupos. CONCLUSÃO: Na avaliação funcional de pacientes submetidos à reconstrução do LCA, não é aconselhável a utilização de apenas um instrumento de medida, porque a correlação significativa entre déficit no pico de torque, questionários de função, frouxidão ligamentar e testes de salto não é encontrada em todos os grupos testados. OBJECTIVES: The aim of this study was to analyze the correlation between deficits in the isokinetic peak torque of the knee extensors and flexors with hop tests, postoperative knee laxity and functional scores in normal and ACL- reconstructed subjects with patellar tendon and hamstring tendon autografts. METHODS: Sixty male subjects were enrolled and subdivided into three groups: Twenty subjects without knee injuries (GC group) and two groups of 20 subjects submitted to ACL reconstruction with patellar tendon (GTP group) and hamstrings autograft (GTF group). RESULTS: The results showed significant correlation between knee extensors peak torque and performance in the hop tests for GTF and GC groups. There are no significantly correlations between post op knee laxity and Lysholm score compared with the hop tests and peak torque deficits. Concerning the differences between groups, the GTP group showed greater peak torque deficits in knee extensors, worst Lysholm scores and higher percentage of individuals with lower limb symmetry index (ISM) < 90% in both hop tests when compared to the other two groups. CONCLUSION: It is not recommendable to use only one measurement instrument for the functional evaluation of ACL-reconstructed patients, because significant correlation between peak torque, subject's functional score, knee laxity and hop tests were not observed in all groups.

OBJECTIVES: The aim of this study was to evaluate the reliability and validity of a modified isometric dynamometer (MID) in performance deficits of the knee extensor and flexor muscles in normal individuals and in those with ACL reconstructions. METHODS: Sixty male subjects were invited to participate of the study, being divided into three groups with 20 subjects each: control group (GC), group of individuals with ACL reconstruction with patellar tendon graft (GTP, and group of individuals with ACL reconstruction with hamstrings graft (GTF). All individuals performed isometric tests in the MID, muscular strength deficits collected were subsequently compared to the tests performed on the Biodex System 3 operating in the isometric and isokinetic mode at speeds of 60o/s and 180o/s. Intraclass ICC correlation calculations were done in order to assess MID reliability, specificity, sensitivity and Kappa's consistency coefficient calculations, respectively, for assessing the MID's validity in detecting muscular deficits and intra-and intergroup comparisons when performing the four strength tests using the ANOVA method. RESULTS: The modified isometric dynamometer (MID) showed excellent reliability and good validity in the assessment of the performance of the knee extensor and flexor muscles groups. In the comparison between groups, the GTP showed significantly greater deficits as compared to the GTF and GC groups. CONCLUSION: Isometric dynamometers connected to mechanotherapy equipments could be an alternative option to collect data concerning performance deficits of the extensor and flexor muscles groups of the knee in subjects with ACL reconstruction.

OBJETIVO: Analisar a confiabilidade e validade de um dinamômetro isométrico modificado (DIM) na avaliação dos déficits no desempenho muscular dos extensores e flexores do joelho em indivíduos normais e com reconstrução do LCA. MÉTODOS: Foram convidados 60 voluntários do sexo masculino a participar do estudo, divididos em três grupos de 20 indivíduos: grupo controle (GC), grupo com reconstrução do LCA com tendão patelar (GTP) e grupo com reconstrução do LCA com tendões flexores (GTF). Todos os indivíduos realizaram teste isométrico dos extensores e flexores do joelho no DIM; os déficits de força muscular coletados foram comparados posteriormente com os testes realizados no Biodex System 3 operando no modo isométrico e isocinético nas velocidades de 60º/s e 180º /s. Foram realizados cálculos de correlação intraclasse ICC para avaliar a confiabilidade do DIM, cálculos da especificidade, sensibilidade e coeficiente de concordância Kappa, respectivamente, para avaliar a validade do DIM em detectar déficits musculares e comparações intragrupos e intergrupos na realização dos quatro testes de força utilizando-se do método ANOVA. RESULTADOS: O DIM demonstrou excelente confiabilidade teste-reteste e validade na avaliação do desempenho muscular dos extensores e flexores do joelho. Na comparação intergrupos. o GTP demonstrou déficits significativamente maiores dos extensores comparados com os grupos GC e GTF. CONCLUSÃO: Dinamômetros isométricos conectados em equipamentos de mecanoterapia podem ser uma alternativa para coletar dados referentes a déficits no desempenho muscular dos extensores e flexores do joelho em indivíduos com reconstrução do LCA.OBJECTIVES: The aim of this study was to evaluate the reliability and validity of a modified isometric dynamometer (MID) in performance deficits of the knee extensor and flexor muscles in normal individuals and in those with ACL reconstructions. METHODS: Sixty male subjects were invited to participate of the study, being divided into three groups with 20 subjects each: control group (GC), group of individuals with ACL reconstruction with patellar tendon graft (GTP, and group of individuals with ACL reconstruction with hamstrings graft (GTF). All individuals performed isometric tests in the MID, muscular strength deficits collected were subsequently compared to the tests performed on the Biodex System 3 operating in the isometric and isokinetic mode at speeds of 60º/s and 180o/s. Intraclass ICC correlation calculations were done in order to assess MID reliability, specificity, sensitivity and Kappa's consistency coefficient calculations, respectively, for assessing the MID's validity in detecting muscular deficits and intra-and intergroup comparisons when performing the four strength tests using the ANOVA method. RESULTS: The modified isometric dynamometer (MID) showed excellent reliability and good validity in the assessment of the performance of the knee extensor and flexor muscles groups. In the comparison between groups, the GTP showed significantly greater deficits as compared to the GTF and GC groups. CONCLUSION: Isometric dynamometers connected to mechanotherapy equipments could be an alternative option to collect data concerning performance deficits of the extensor and flexor muscles groups of the knee in subjects with ACL reconstruction.