Osteochondroma of the bicipital tuberosity causing an avulsion of the distal biceps tendon.

Osteochondromas are one of the most common benign bone tumors. They usually arise from the metaphyses of long bones. Involvement of the bicipital tuberosity is rare. To date, no reports have described avulsed rupture of the distal biceps tendon caused by an osteochondroma of the bicipital tuberosity. This article presents a case of avulsion of the distal biceps tendon secondary to sessile osteochondroma of the bicipital tuberosity in a 65-year-old right-handed sedentary worker who presented with insidious pain and limited motion in his left elbow for 2 months. Intraoperative findings showed a bony mass of 25×23×5 mm with osteocartilaginous nodules on the bicipital tuberosity. The distal biceps tendon with an avulsed bony fragment was displaced proximally, with a 20-mm gap between the tendon and the bicipital tuberosity. After complete excision of the mass, footprint preparation at the bicipital tuberosity was performed using a 4.0-mm burr and anatomic reattachment of the distal biceps tendon with a 5.0-mm suture anchor. The pathologic diagnosis of osteochondroma was confirmed microscopically. We suggest that osteochondroma of the bicipital tuberosity be considered as a cause of painful limitation of forearm rotation or avulsed rupture of the distal biceps tendon.