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  • Title: Influences of hip external rotation strength on knee mechanics during single-leg drop landings in females.
    Author: Lawrence RK, Kernozek TW, Miller EJ, Torry MR, Reuteman P.
    Journal: Clin Biomech (Bristol, Avon); 2008 Jul; 23(6):806-13. PubMed ID: 18395310.
    Abstract:
    BACKGROUND: To determine the influence of hip external rotation strength on kinematic and kinetic variables during single-leg drop landings. METHODS: Females were divided into strong and weak groups based on isometric hip external rotation strength and lower extremity flexion-extension and varus-valgus kinematics and kinetics were evaluated during single-legged 40 cm drop landings. FINDINGS: Hip external rotation strength had no effect on sagittal or frontal plane angular motion throughout the landing cycle at the hip and knee. The strong group generated a statistically significant decrease in the peak vertical ground reaction force and external knee flexor moment. The weak group produced a greater external knee adduction moment, net knee anterior shear joint reaction force, and a greater hip external adduction moment. INTERPRETATION: Subjects with greater hip and quadriceps/hamstring strength exhibited a significant decrease in the vertical ground reaction force and external knee adduction and flexor moments. Hip and knee strength appear to relate to differences in high risk landing strategies.
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