Isolated Distal Tibiofibular Syndesmotic Injury: A Case Series and Proposed Mechanism

Objective: To review imaging findings of isolated tibiofibular interosseous membrane (IOM) injury and propose an injury mechanism. Case Report: A retrospective review was conducted on five patients who presented with lower leg pain following a traumatic athletic injury. MRI examinations revealed isolated tibiofibular IOM injury without associated fractures or distal syndesmotic disruption. The observed injury patterns, along with the blunt, non-rotational trauma reported in each case, suggest that the mechanism behind this unique presentation may involve sudden traction or direct impact to the lower leg. Conclusion: Isolated tibiofibular IOM injury should be considered in patients with lower leg pain after blunt trauma. MRI of the entire tibia and fibula can be instrumental in characterizing and confirming the injury and should be considered when clinical and injury mechanism indicators are present.