Clinical efficacy analysis of oblique ulnar shortening osteotomy using predrilled hole method for treatment of ulnar impaction syndrome

Objective To investigate the clinical efficacy of oblique ulnar shortening osteotomy using predrilled hole method in the treatment of ulnar impaction syndrome. Methods From May 2012 to July 2015, 35 cases of ulnar impaction syndrome were treated by oblique ulnar shortening osteotomy using predrilled hole method. The operation time was recorded, and the pain and functional recovery before and after the operation were compared. The clinical outcomes were evaluated according to the VAS score, the modified Mayo wrist score and the disabilities of the arm, shoulder and hand (DASH) questionnaire. Results The average operation time was 45.7 min (range, 32 to 60 min). All the patients were follow-up for 6 to 36 months with an average of 15 months. The osteotomy site achieved bone healing in all cases with the average healing time being 12 weeks. Postoperative VAS score reduced from 7.4±0.6 to 2.8±1.3. Modified Mayo wrist score increased from 53.0±16.3 to 84.0±10.2. The results were excellent in 23 cases, good in 10 cases and fair in 2 cases. DASH value declined from 57.0±18.2 to 26.1±18.5. The differences were all statistically significant (P<0.05). Postoperative plate irritation occurred in 5 patients. Conclusion Oblique ulnar shortening osteotomy using predrilled hole method can reduce the soft tissue injury with higher bone healing rate and less complications and achieve the same clinical effects as application of osteotomy instruments. Key words: Ulna; Treatment outcome; Osteotomy; Ulnar impaction syndrome