The effect of hip muscle weakness and femoral bony deformities on gait performance

Background:Children with cerebral palsy (CP) present a pathological gait pattern due to musculoskeletal impairments, such as muscle weakness and altered bony geometry. However, the effect of these impairments on performance is still unknown. Research aim:This study aimed explore hip femoral deformities CP typical developing (TD) subjects. Methods:6400 models were created by weakening extensors, abductors, adductors flexors from 0% 75 % increasing anteversion angle (FAA) neck shaft (NSA) 20° 60° 120° 160°, respectively. One TD five patterns imposed each model forces calculated. The capability gap (CG) at hip, i.e. lack in moment generating capacity perform pattern, was investigated using regression analysis. Results:The CG apparent equinus, stiff knee gait, jump true equinus increased 0.080, 0.038, 0.015, 0.023 0.005 Nm/kg per 10 percent abductor increase, 0.211, 0.130, 0.056, 0.045 0.011 degrees FAA increase 0.163, 0.036, 0.043 NSA Combined explained 96 %, 85 82 65 40 35 variance crouch Significance:The results suggest that surgical correction more likely be effective than strength training muscles enhancing performance. Jump especially robust, while limited deformities.