Spastic paretic stiff-legged gait - Biomechanics of the unaffected limb

A concern for individuals with hemiparesis affecting their gait, which here tofore has never been studied, is the possibility that various compensation s occurring in the unaffected limb may strain or fatigue the muscles or lig aments and/or predispose to joint injury in that limb. We studied the biome chanics of the unaffected limb during walking in 20 subjects with hemipares is who had stiff-legged gait as a result of stroke. An optoelectronic motio n analysis and force platform system was used to estimate torques in all th ree planes about the hip, knee, and ankle. Sagittal plane joint motion and power about the unaffected hip, knee, and ankle were also studied. Data wer e compared with control walking data collected from 20 able-bodied controls , On average, peak torques and powers were all either reduced or the same c ompared with controls, even though in some instances values were >2 standar d deviations (SD) above the control means. Our findings suggest that can av erage the probability of excessive muscular-tendon effort and the risk for biomechanical injury in the unaffected limb are minimal compared with able- bodied, walking controls. However, given individual variability, we recomme nd routine clinical gait analysis for all people with stiff-legged gait to eliminate excessive values in certain biomechanical parameters, which could , if not addressed, predispose to muscle-tendon strain or joint or ligament ous injury.