Dynamic analysis of transfemoral amputee's musculoskeletal system using muscle activation control parameters measured by FES experiments

Recently, the increase of transfemoral amputees from industrial disasters, traffic accidents, vascular diseases and aging is emerging as a social issue. For transfemoral amputees, it is very important to recover their lost functions. Myoplasty, which is one of above-knee amputation methods that sutures muscles on the femoral stump, is used more commonly than other operation methods because it is superior in muscle setting and appearance. Myodesis fixes femoral stump muscles onto the femur. For these different operation methods, there have been controversies over which is better due to lack of scientific analysis. Thus, the present study applied electric stimulation to the tibial muscle of dogs in vivo and in situ and measured the dynamic physical characteristics of the muscle after making the dogs do isokinetic exercise in the state of full activation. In addition, we performed tension experiment with the dogs’ medial tibialis cranicalis muscle and tendon to examine the kinetic characteristics of the muscle and tendon, and analyzed isokinetic flexion, extension, adduction and abduction exercise by applying the characteristics to the muscle models of transfemoral amputees who had received different types of operation. In case of isokinetic flexion, adduction and abduction, the model of transfemoral amputees who had myoplasty was superior to that of transfemoral amputees who had myodesis in the moment of coxal articulation and the range of motion. On the contrary, in case of isokinetic extension, no significant change was observed in moment Keywords-myodesis; myoplasty; isokinetic exercise; forward dynamics; flexion; extension; abduction; adduction