The Effect of Ulnar Styloid Fractures on Patient-Reported Outcomes After Surgically Treated Distal Radial Fractures.

Ulnar styloid fractures (USFs) are often associated with distal radial fractures (DRFs). When unstable DRFs are treated surgically, any associated USF is most commonly left untreated. The purpose of this study was to evaluate the effect of a concomitant USF on outcome after surgical stabilization of a DRF. Methods: Data from 2 randomized controlled trials on the treatment of unstable DRFs were pooled. The effect of a USF on the QuickDASH, EQ-5D, pain, and range of motion at 2 years was evaluated. Results: Two hundred and eighty-one patients were included; 177 (63%) had an associated, untreated USF. An unadjusted analysis demonstrated no significant difference in functional or patient-reported outcome measures (PROMs) at 2 years between patients with or without a concomitant USF. When controlling for confounding factors, the presence of a USF did not predict change in any of the PROMs from baseline to 2 years. A concomitant USF also did not predict change in grip strength or range of motion, except for a small effect on extension (-4.1°; 95% confidence interval, -7.5° to -0.8°; p = 0.02), which probably does not have clinical relevance. Conclusions: A USF in combination with a DRF does not affect PROMs, range of motion, or grip strength. We recommend that concomitant USFs be left untreated when treating a DRF with surgical fixation. Level of Evidence: Prognostic Level I. See Instructions for Authors for a complete description of levels of evidence.