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Three-dimensional kinematics of ankle instability following serial sectioning of lateral collateral ligaments

, : Three-dimensional kinematics of ankle instability following serial sectioning of lateral collateral ligaments. Foot & Ankle 5(3): 142-149

Triaxial kinematics of ankle instability were studied in vitro by applying an inversion force to seven nonaxially loaded cadaveric ankle-foot specimens. In intact specimens, mean maximal adduction of the tibia with respect to the calcaneus was 38 degrees and mean maximal external rotation was 24 degrees; maximal displacement occurred near full plantar flexion. Increases after release of ligaments were as follows: calcaneofibular, maximal adduction 10%, external rotation 3% near 15 degrees of plantar flexion; anterior talofibular, adduction 30%, external rotation 8% at 30 degrees of plantar flexion; both, adduction 41%, external rotation 65% near 0 degree of flexion; all three lateral collateral, adduction 42%, external rotation 240% in slight dorsiflexion. Regardless of the status of the lateral collateral ligaments, the talus adducted and externally rotated 18 degrees +/- 1 degree with respect to the calcaneus. Hence, collateral ligament release had no effect on subtalar motion.


PMID: 6519605

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