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The significant improvement in ulnar drift that occurred in patients who underwent SMPA versus no surgery remained even after adjustment for baseline severity, age, sex, and use of biologics.
The adjustment was especially important because the nonsurgical group had better function at baseline, with significantly stronger grip and pinch strength, better Michigan Hand Questionnaire (MHQ) scores, and significantly better ulnar drift, extensor lag, and arc of motion than did the surgical group (Arthritis Care Res.