Changes in ground reaction force during jump landing in subjects with functional instability of the ankle joint

Clinical Biomechanics
Brian Caulfield, Mary Garrett

Abstract

To identify changes in ground reaction force during jump landing in subjects with functional instability of the ankle joint. Comparison of ground reaction force during jump landing between subjects with functional instability and healthy controls. We have recently demonstrated significantly altered patterns of ankle and knee movement immediately pre- and post-impact in subjects with functional instability compared to healthy controls. We now examine the changes in timing and magnitude of forces sustained by the unstable ankle during jump landing. Fourteen subjects with unstable ankles and 10 age, sex and activity matched controls performed five single leg jumps onto a force platform whilst ground reaction forces were sampled. Timing and magnitudes of forces during the first 150 ms following impact were analysed and compared between groups. Lateral and anterior force peaks occurred significantly earlier in subjects with functional instability. Significant differences were seen between groups' time-averaged vertical, frontal and sagittal components of ground reaction force. These ranged from 5% (frontal force) to 100% (vertical force) of body mass. These changes occur immediately post-impact and too early for reflex correction/mo...Continue Reading

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