Tibiotalar Contact Area and Pressure Distribution: The Effect of Mortise Widening and Syndesmosis Fixation:

摘要: An unconstrained cadaver ankle model was designed to reevaluate the effect of mortise widening and syndesmotic fixation on load-bearing characteristics tibiotalar joint. Tibiotalar contact area, centroid shift, mean pressure were quantified using a pressure-sensitive film technique. Six fresh-frozen below-knee amputation specimens axially loaded with 500 N in three positions: neutral, 10 degrees dorsiflexion, 20 plantarflexion. The area position for each specimen its intact state first determined then compared values obtained after fixation, 2 4 mm, deep deltoid ligament transection. Syndesmotic significantly decreased joint but did not consistently affect position. However, unlike earlier studies, which used more constrained fracture models, or without rupture found position, pressure. When statically loaded, talus moved maximal congruence mortise, rather than displacing laterally along lateral malleolus.