[Ulnar Shortening Osteotomy - Two Weeks of Immobilization Sufficient].

Background: Diaphyseal ulnar shortening osteotomy (USO) as surgical treatment of ulnar impaction syndrome is standardized nowadays with good to very good results. In contrast, a wide spectrum of different postoperative treatment regimens can be found in the current literature. The results after USO with modern, angular stable implants with immobilization for 2 weeks are presented.

Patients and methods: A retrospective database analysis identified 49 patients (31 women, 18 men, mean age 37.6 years) with a total of 51 USO over a 13-year period and were followed up for 73.5 (15.9-192.9). All USO were obliquely sawed and stabilized with palmar locking implants. The wrist was immobilized postoperatively in 30° extension in a dorsal forearm splint for 2 weeks.

Results: All USO showed load-stable consolidation signs after an average of 7.0 (SD 1.9; 4.9-14.1) weeks. Wrist range of motion was significantly improved in extension/flexion from 107.6° (60-155) preoperatively to 123.7° (80-160) postoperatively and in ulnar/radial deviation from 55.1° (25-90) to 60.8° (30-90) (p<0.05). Pain level was significantly reduced from 3.2 (0-8) to 0.1 (0-2) at rest and from 7.3 (4-10) to 1.2 (0-9) under weight bearing (p<0.01). A total of 5 complications (9.8%) were noted. Nonunion was not found.

Conclusion: By using angular stable implants to stabilize a USO, the duration of immobilization can be reduced to 2 weeks without compromising bone healing.