A Multicentre Outcomes Study of the Diaphyseal Ulnar Osteotomy with a Dedicated Compression Plate

<b>Background:</b> Diaphyseal ulna shortening osteotomy (USO) is an accepted treatment for multiple ulnar sided wrist pathologies. Recently, a number of specifically designed compression plates for USO have become available. The purpose of the study was to assess the outcomes of an ulnar osteotomy compression plate system for USO across multiple centres. <b>Methods:</b> A multicentre cohort study was conducted on USO performed for a variety of ulnar-sided wrist pathologies using a USO compression system. Radiographic, clinical and subjective outcomes were assessed postoperatively and compared between aetiologies. <b>Results:</b> A total of 174 USOs were performed with union achieved in 170 osteotomies. Overall satisfaction was high and 83.2% returned to work. And 31.6% of patients required plate removal. <b>Conclusions:</b> The use of a specific USO compression plate provides a reasonable option for USO with similar results across multiple sites. High union rates can be achieved. However, the incidence of plate removal was high and remains a potential concern warranting further study. <b>Level of Evidence:</b> Level IV (Therapeutic).