Short- to mid-term results of ulna head replacement as both a primary and revision implant.

We present the results of short- to medium-term follow-up of 10 patients following ulna head replacement. The mean age of patients was 63.2 years (range 48-81 years), with the mean duration of follow-up being 48 months (12-88 months). The indications for the procedure were primary osteoarthritis (n = 3), post-traumatic osteoarthritis (n = 4), failed Darrach's procedure (n = 2) and rheumatoid arthritis (n = 1). Two patients required revision (20%), one for gross aseptic loosening of the stem and another for an initially oversized head. At final follow-up, the satisfactory rate was 90%. The mean VAS score was 2.4 (range 0-8). The average DASH score was 37 (range 0-72.5). Our study suggests that ulna head replacement can give satisfactory forearm function; however, concerns exist regarding bone resorption and tapering around the prosthesis, which may affect the long-term performance of the prosthesis. LEVEL OF EVIDENCE: IV.