Re-examination of hip flexion angle-moment characteristics

Abstract

BACKGROUND: Hip flexion angle-moment may not be measured accurately due to the measurement posture. OBJECTIVE: Maximum isometric hip flexion moment was measured while excluding the effects of postural retention function and compensatory motion. METHODS: Experiment 1: Maximum isometric flexion moment of the hip joint was measured at 0∘, 30∘, 60∘, 90∘, and 105∘ in 195 participants. Experiment 2: Maximum isometric hip flexion moment of 33 participants was measured in standing and supine position at 0∘ hip flexion and in end-sitting and supine position at 105∘. RESULTS: Experiment 1: No interaction was observed between sex and hip angle, and hip flexion moment was minimum at 0∘ hip flexion and maximum at 105∘ hip flexion in both sexes (p< 0.01). Experiment 2: An interaction between measurement position and hip angle was observed, with maximum isometric flexion moment being greater in the supine position than in the standing position (p< 0.01). Maximum isometric hip flexion moment was greater at 105∘ than at 0∘ flexion (p< 0.01). CONCLUSIONS: Maximum isometric hip flexion moment showed greater joint angle-moment characteristics in deep flexion than in shallow flexion of the hip when excluding the effects of postural retention function and compensatory motion.