Posterior fracture dislocation of the shoulder with biceps tendon interposition.

Posterior dislocation of the shoulder, a rare injury, results from direct trauma, indirect trauma, or via a seizure or electrical shock. We present a case with a posterior fracture dislocation of the shoulder secondary to a seizure in which interposition of the biceps tendon precluded closed reduction. The fractured lesser tuberosity fragment included the bicipital groove, allowing the biceps tendon to sublux posteriorly preventing closed reduction, thus requiring a subsequent open reduction.