Results of isolated ulnar shaft shortening osteotomy in the treatment of idiopathic ulnocarpal impaction syndrome.

The objective of this study was to evaluate the results of isolated ulnar shaft shortening osteotomy (USSO) in the treatment of idiopathic ulnocarpal impingement syndrome. This was a two-center retrospective study. All patients older than 18 years who underwent isolated USSO for idiopathic ulnocarpal impingement syndrome between 2006 and 2016 were included. The outcome measures were: patient satisfaction, decrease in pain intensity, change in occupation, QuickDASH and PRWE functional scores, secondary palliative surgery suggesting failure of the ulnar shaft shortening osteotomy, and postoperative ulnar variance. The main complications were analyzed. Thirty-one patients were included. Twenty-six (84%) were satisfied with the procedure. At an average follow-up of 62 months, there was no secondary palliative surgery. Mean pain intensity on VAS was 7/10 (range, 2-10) and 1.7/10 (range, 0-6) preoperatively and postoperatively, respectively, for a mean decrease of 5.3 ± 2.6 points; this decrease was statistically significant (p < 0.001). None of the manual workers had to alter their work. Mean postoperative QuickDASH score was 19.6/100 (range, 0-79.55) and mean postoperative PRWE score was 23/100 (range, 1-85). Mean postoperative ulnar variance was -0.5 mm. As for complications, 61% of patients (n = 19/31) had discomfort related to the plate; 9.7% (n = 3/31) had distal radioulnar osteoarthritis; 4% (n = 1/19) had a fracture after hardware removal; 13% (n = 4/31) had non-union. Despite a high rate of complications, the study confirmed the effectiveness, in terms of pain, of isolated USSO in the treatment of idiopathic ulnocarpal impingement syndrome. LEVEL OF EVIDENCE: IV; retrospective cohort.