Background. Fractures of the radial head result from an axial force that causes impaction against the capitellum. Associated lesions of the capitellum in this pattern of injury have been previously reported in the orthopaedic literature as an uncommon occurrence. Methods. All patients presenting to the clinics of the senior surgeon between 1998-2008 with radial head fractures requiring surgery were included. Data collected included demographics (age, gender, side of injury), mechanism, timing of injury and injury type (Mason classification). Intraoperative findings including evidence of union, capitellar injury, associated joint dislocation, collateral ligament injury, and any other fractures around the elbow were documented. Results. We reviewed 109 consecutive patients presenting with radial head fractures. 67% of the patients were found to have the PLUCCAR lesion, a capitellar slither of cartilage impacted in the radial fracture. Of these, 76.9% of patients with a Mason I injury had a PLUCCAR lesion, 76.7% of patients with Mason II injury had a PLUCCAR lesion, and only 33.3% of patients with
