The interosseous syndesmotic ligament is the condensed distal portion of the leg interosseous membrane, forming the deep central constraint between tibia and fibula at the mortise level.
Provides the central fibrous connection between tibia and fibula, resisting fibular diastasis in all directions and supplementing the AITFL and PITFL.
Disrupted in complete syndesmotic injuries — MRI demonstrates signal change. Intraoperative stress testing after ankle fracture fixation assesses integrity.
Complete interosseous ligament tear indicating severe syndesmotic instability requiring screw or suture-button fixation to maintain mortise width.
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