Turkish Journal of Medical Sciences




Background/aim : Distal radius fractures (DRFs) are frequently associated with distal radioulnar joint (DRUJ) instability. The purpose of this study is to evaluate the effect of the sigmoid notch and ulna styloid fracture types on DRUJ subluxation following closed reduction and casting of DRFs via calculating radioulnar ratio (RUR) on post-reduction computed tomography (CT) images. Materials and methods: In our study, post-reduction CT images of 202 patients with distal radius fractures was evaluated retrospectively. CT images were evaluated for RUR, sigmoid notch fracture, and ulna styloid types. Sigmoid notch fractures were classified as non-displaced in the sigmoid notch fractures (NDS) and displaced sigmoid notch (DS) fractures; ulna styloid fractures were grouped as the proximal half ulna styloid (PHUS) and distal half ulna styloid (DHUS) fractures. Results: The mean age of Rozental type 3b (62,8 years) was significantly higher among others. The mean RUR value was significantly higher in Rozental type 3a in compared to type 1a and type 2 fractures. PHUS fractures were more common with DS fractures than DHUS fractures. Conclusion: DS fractures and higher patient age are associated with DRUJ subluxation on post-reduction CT images following DRFs. DS fractures are seen more commonly with PHUS fractures than DHUS. Patients with PHUS should be carefully assessed for sigmoid notch fractures and DRUJ congruency. These findings could be helpful for pre-operative decision making in the treatment of DRFs.


Distal radioulnar joint instability, sigmoid notch fracture, ulna styloid fracture

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