Pediatric Olecranon Osteochondral Flap Fractures With Subtle Radiographic Abnormality.

Pediatric olecranon osteochondral flap fractures are shear injuries of the humeroulnar joint with elevation of an articular cartilaginous flap from the subchondral bone of the olecranon articular surface. All previously reported cases included an osteochondral flap containing the coronoid, with varying imaging and fixation methods used. We treated 2 pediatric patients with this injury. One of our patients had a large, displaced osteochondral fracture of the medial semilunar notch including the coronoid, in addition to avulsions of the medial flexor mass and distal ulnar collateral ligament. The other patient sustained a displaced, rotated osteochondral fracture including the coronoid with subsequent humeroulnar subluxation. Both fractures were anatomically reduced and fixed with absorbable suture, leading to excellent results at 1 year. A high degree of suspicion, thorough work-up, and anatomical reduction of all injured structures are paramount in treatment of this rare, difficult-to-diagnose injury.