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- W1986308669 abstract "1462 Inappropriate coordination of several common anatomical mechanisms may in part be responsible for the dramatic rise in ACL injuries amongst athletes. Firstly, two biarticular muscle groups, the hamstrings and quadriceps, cross both the hip and the knee. Secondly, co-activation is common amongst these antagonists. Thirdly, maximal tension varies directly as a result of in vivo muscle length. Certain sporting activities may permit injurious (unstable) conditions to exist at one joint (the knee) as a result of inappropriate muscular control at a second joint (the hip). Specifically, if reduced hip flexion postures are used to conduct sudden landing or deceleration movements (common to basketball lay-ups, volleyball spikes, alpine skiing), then the quadriceps' high compensatory knee extensor torques, acting in combination with large transferred ground reaction forces, may excessively accelerate the tibia anteriorly from beneath the femur, hence, ACL injury may be incurred. Less goal-oriented methods for decelerating the human body typically involve hip flexed postures. These activities functionally invoke use of the hamstrings' force-length relationship to provide more effective countering of the tibia's large anterior shear forces. Twenty female subjects were tested to determine the simultaneous effects of 5 hip and 5 knee postures (10°, 30°, 50°, 70°, 90° each) upon the knee's isometric Hamstrings/Quadriceps Ratio (HQR). HQR increases of 38% to 99% (p<.05) were produced when the hip angle was increased from 10° to 90° for the 10° to 90° knee conditions, respectively. These findings imply that to facilitate ACL-protective hamstrings' tension, athletes should concentrate upon using both hip- and knee-flexed postures whenever large knee extensor torques are demanded." @default.
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- W1986308669 date "1999-05-01" @default.
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- W1986308669 title "LACK OF HIP FLEXION: A MECHANISM FOR ACL INJURY?" @default.
- W1986308669 doi "https://doi.org/10.1097/00005768-199905001-01458" @default.
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