Evaluation of the hip muscles mechanical behavior in transfemoral amputees / Avaliação do comportamento mecânico dos músculos do quadril em amputados transfemorais

AUTOR(ES)
DATA DE PUBLICAÇÃO

2006

RESUMO

Introduction Amputation at the transfemoral level leads to anatomical and functional adaptations that change the gate pattern and influences daily-life activities. It is well known that the side of the amputation presents lower force. However, it is not known if there is a specific angular position or angular velocity in that the force is even lower. Moreover, how amputation affects the type of muscular contraction and the force generated in the contralateral side needs further investigation. Objectives: to investigate torque and mechanical work generated by hip muscles in transfemoral amputees subjects during concentric and eccentric isometric contractions. Furthermore, to compare these parameters with the non-involved side and a control non-amputee group. Methods: Thirteen subjects (mean age ±SD, 27,2 ± 7,6 years, mean height ± SD, 1,74 ± 0,05 cm, mean weight 69,7 ± 9,9 kg) in the control group and ten (mean age ±SD, 37,7 ± 12,5 years, mean height ± SD, 1,70 ± 0,09 cm, mean weight 63,9 ± 7,5 kg) in the amputee group participated in the study. A dynamometer Biodex System 3 Pro was used to measure torque and mechanical work in four (0º, 10º, 20º e 30) hip abduction positions during hip abduction and adduction efforts, and four (0º, 30º, 60º e 90) hip abduction positions during hip flexion and extension. Concentric and eccentric contractions were evaluated during 30º/s, 90º/s and 150º/s. Results: The amputee group presented significant reduction in the isometric torque generated in the ipsilateral side, mainly when the muscle was further stretched. For concentric and eccentric contractions, in high angular velocity, the control group presented significantly higher torque values when compared with the both sides of the amputee group. Interestingly, the torque and mechanical work generated by the amputee group, in both sides, were significantly higher compared with the control group. Mechanical work might be an important parameter to understand muscular conditions in the amputee population. Conclusion: The present study showed that transfemoral amputees have alterations in hip muscles torque and mechanical work generation, in the involved and uninvolved side, according to the joint position and angular velocity.

ASSUNTO(S)

femur fêmur hip joint torque amputees articulação do quadril biomechanics/instrumentation amputation/rehabilitation biomecânica/instrumentação amputados torque amputação/reabilitação

ACESSO AO ARTIGO

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