Patient-related factors influencing ulnar-shortening osteotomy outcomes using the trimed dynamic compression plate.

Ulnocarpal impingement can be surgically managed with various shortening osteotomy techniques. The purpose of this study was to retrospectively examine the outcomes of the ulnar-shortening osteotomy technique using the Trimed dynamic compression plate (Valencia, California) and to determine whether results vary among patient-related factors, including smoking status, occupation, preoperative diagnosis, and workers' compensation status. Twenty-seven patients (28 wrists) operated by a single surgeon underwent ulnar shortening over a 4-year span. Radiographic analysis was obtained preoperatively and at an average 24-month follow-up. A subset of 12 patients completed the Disabilities of the Arm, Shoulder and Hand (DASH) inventory; the Patient-Rated Wrist Evaluation (PRWE); and the visual analog scale for pain and underwent clinical evaluation for range of motion and strength. Ulnar variance improved in all cases between pre- and postoperative imaging (P<.05). Grip strength and range of motion were found to be 79% and 90% of the contralateral extremity, respectively. Among the examined patient-related factors, patients involved in a workers' compensation claim demonstrated significantly different DASH (average, 56.8 claim vs 26.8 no claim; P=.037) and PRWE (average, 66.0 claim vs 32.8 no claim; P=.008) scores while also showing a trend toward nonunion (3/10 claim vs 1/18 no claim; P=.105). Results of ulnar-shortening osteotomy using the Trimed system at 2-year follow-up show consistent objective improvements in radiographic ulnar variance. Workers' compensation claims may negatively influence outcomes of ulnar shortening, and this factor should be considered in preoperative patient selection and counseling.