The effect of the moving contact zone is quite significant; at angles of less than 60° knee flexion the quadriceps lever arm works with a mechanical advantage, however, at angles of greater than 60° knee flexion the quadriceps work at a mechanical disadvantage.
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Thai version of the Survey Instrument for Natural History, Aetiology and Prevalence of Patellofemoral Pain: Cross-cultural validation and test-retest reliability.
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