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The Journal of Bone and Joint Surgery, Vol 65, Issue 1 81-88, Copyright © 1983 by Journal of Bone and Joint Surgery, Inc
The contribution of the anterior talofibular ligament to ankle laxity
EE Johnson and KL Markolf
The motion responses of thirty fresh-frozen cadaver tibiotalar joints were
measured for applied anterior-posterior force, inversion-eversion moment,
and internal-external rotary torque. The load-motion response curves
obtained after sectioning the anterior talofibular ligament were compared
with those for intact specimens in three positions of flexion of the ankle.
Laxity of the intact ankle was shown to be dependent on flexion position;
dorsiflexion was consistently the position of least laxity, reflecting the
effects of talar geometry and its articulation with the tibiotalar
syndesmosis. Section of the anterior talofibular ligament produced
significant increases in laxity for all modes tested. Total
anterior-posterior laxity increased by 4.3 millimeters in dorsiflexion,
which was the position of maximum change. In contrast, the greatest
increases in total inversion-eversion laxity (5.2 degrees) and total
internal-external rotation laxity (10.8 degrees) were recorded in plantar
flexion.
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