This prospective study demonstrated a statistically significant relative hypermobility of the subtalar and medial column joints following ankle arthrodesis, and may account for the functional gait which can be achieved following ankle arthrodesis. The significantly increased subtalar range of movement appeared to cause impingement of the posterior part of the posterior facet of the subtalar joint which may account for the increased incidence of subtalar arthritis following arthrodesis. Preoperative arch height can be used to predict both residual motion and function after ankle arthrodesis.
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