Knee kinetics in trans-tibial amputee gait

This study evaluated the mechanics of the knee during gait in persons with trans-tibial amputations. Spatiotemporal, kinematic, kinetic, and electromyographic data (EMG) were collected from ten individuals with trans-tibial amputations and ten control subjects during level walking. Results found that the trans-tibial amputee (TTA) group had significantly greater EMG activity of the knee extensors and knee flexors compared to normal. The muscle action of the TTA group was inconsistent with the knee kinetic data as demonstrated by a minimal external knee flexion moment and negligible knee power. The discrepancy between the mechanical and physiological measures of knee demand in this population illustrates the need for an integrated approach for the study of joint function during gait (i.e. EMG in combination with kinetic measures).