Abstract
The effect of fibular displacement and deltoid ligament injury on the contact area and peak intra-articular pressure of the tibiotalar joint was examined in nine fresh cadaveric specimens. The contact area and peak intra-articular pressure of the tibiotalar joint were measured using an electronic pressure sensor and pressure-sensitive film in four different positions from 10°dorsiflexion to 20° plantar flexion in 10° increments. The ankles were tested in three stages of progressive joint disruption: •intact ankle joint•isolated Weber type B fibula fracture•Weber type B fibula fracture with deltoid ligament injury.Removal of the lateral malleolus did not have a significant effect on either the contact area or peak intra-articular pressure of the tibiotalar joint. Sectioning the deep deltoid ligament also had no significant effect on these parameters. These results suggest that Weber type B injuries with no damage to the medial side of the joint are amenable to non-operative management.
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