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We deeply apologize: We were unaware of the case report by Minami et al.1Minami A. Ogino T. Tohyama H. Multiple ruptures of flexor tendons due to hypertrophic change at the distal radio-ulnar joint.J Bone Joint Surg. 1989; 71A: 300-302Google Scholar Our manuscript2Hattori Y. Doi K. Hoshino S. Sakamoto S. Yutaka K. Attritional rupture of the flexor tendons to the small finger caused by osteophyte of the ulnar head: case report.J Hand Surg. 2010; 35A: 24-26Google Scholar had to be revised several times, and unfortunately during that process we did not update our references. The case reported by Minami et al. is similar to our case regarding the existence of sharp osteophyte of the distal end of the ulna. However, their case had dorsally displaced malunion of distal radius fracture with 7 mm of positive ulnar variance. As the authors mentioned, shift of the distal end of the ulna was probably an important factor in the ruptures of the flexor tendons, and the osteoarthritic spicule at the distal end of the ulna frayed the tendons when the forearm was supinated.1Minami A. Ogino T. Tohyama H. Multiple ruptures of flexor tendons due to hypertrophic change at the distal radio-ulnar joint.J Bone Joint Surg. 1989; 71A: 300-302Google Scholar Our patient had no history of wrist trauma, such as distal radius fracture. Radiographic posteroanterior and lateral views of the wrist showed normal alignment of the radius and ulna and degenerative changes of the distal radioulnar joint with one mm of positive ulnar variance. Compared with their case, the only etiology causing flexor tendon rupture in our case was osteophyte of the volar aspect of the ulnar head without the shift of the distal end of the ulna. However, their case report is a most important reference. We regret that we did not include their previous publication in our bibliography. We deeply apologize: We were unaware of the case report by Minami et al.1Minami A. Ogino T. Tohyama H. Multiple ruptures of flexor tendons due to hypertrophic change at the distal radio-ulnar joint.J Bone Joint Surg. 1989; 71A: 300-302Google Scholar Our manuscript2Hattori Y. Doi K. Hoshino S. Sakamoto S. Yutaka K. Attritional rupture of the flexor tendons to the small finger caused by osteophyte of the ulnar head: case report.J Hand Surg. 2010; 35A: 24-26Google Scholar had to be revised several times, and unfortunately during that process we did not update our references. The case reported by Minami et al. is similar to our case regarding the existence of sharp osteophyte of the distal end of the ulna. However, their case had dorsally displaced malunion of distal radius fracture with 7 mm of positive ulnar variance. As the authors mentioned, shift of the distal end of the ulna was probably an important factor in the ruptures of the flexor tendons, and the osteoarthritic spicule at the distal end of the ulna frayed the tendons when the forearm was supinated.1Minami A. Ogino T. Tohyama H. Multiple ruptures of flexor tendons due to hypertrophic change at the distal radio-ulnar joint.J Bone Joint Surg. 1989; 71A: 300-302Google Scholar Our patient had no history of wrist trauma, such as distal radius fracture. Radiographic posteroanterior and lateral views of the wrist showed normal alignment of the radius and ulna and degenerative changes of the distal radioulnar joint with one mm of positive ulnar variance. Compared with their case, the only etiology causing flexor tendon rupture in our case was osteophyte of the volar aspect of the ulnar head without the shift of the distal end of the ulna. However, their case report is a most important reference. We regret that we did not include their previous publication in our bibliography. Attritional Rupture of the Flexor Tendons to the Small Finger Caused by Osteophyte of the Ulnar Head: Case ReportJournal of Hand SurgeryVol. 35Issue 6PreviewI have read with interest a paper entitled “Attritional rupture of the flexor tendons to the small finger caused by osteophyte of the ulnar head: case report,” by Hattori et al.1 The authors wrote, “We could find no previous reports of attritional flexor tendon rupture due to an osteophyte of the ulnar head.” However, in 1989 we reported a similar case with multiple ruptures of flexor tendons resulting from hypertrophic change at the distal radioulnar joint.2 Their case is similar to ours, including the existence of a sharp spicule of bone on the palmar aspect of the distal end of the ulna. Full-Text PDF