Atraumatic extra-articular patellar dislocation with vertica
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Acute patellar dislocation is a common injury usually associated with a significant traumatic mechanism resulting in lateral displacement. Vertical axis rotation following dislocation is a rare variant of this type of injury and can prevent closed reduction in the acute setting. A 32-year old gentleman presented with an irreducible patella dislocation following an unusual atraumatic mechanism. Following attempts at closed reduction under sedation and regional nerve block, eventual open reduction and soft tissue reconstruction were required under general anesthetic. During the open reduction procedure, it was noted that the patella had dislocated into a lateral extra-articular position and rotated around its vertical axis. Following patella reduction, the medial patellar retinaculum was repaired. Examination under anesthetic revealed satisfactory tracking of patella following repair.

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