척골 경상 돌기 골절을 동반한 원위 요골 골절과 원위 요척 관절 불안정성과의 관계 = The Relationship between Distal Radius Fractures associated with Ulnar Styloid Fractures and Distal Radioulnar Joint Instability

다국어 초록 (Multilingual Abstract)

Objectives: The purpose of this study was to evaluate the patterns (size, displacement) of ulnar styloid process fractures accompanying distal radius fracture and determine their relative contribution to distal radioulnar joint (DRUJ) instability. Materials and Methods: We evaluated 62 cases of distal radius fracture with ulnar styloid fractures who were treated by operation and were followed up for more than six months. Distal radius fractures were classified according to the AO system, and accompanying ulnar styloid fractures were evaluated for both size (0-49%, 50-99%, >100%) and displacement (undisplaced, <2㎜, ≥2㎜). Each distal radius fracture was also evaluated for radiographic and clinical evidence of DRUJ instability at last follow-up. Results: DRUJ instability was revealed in 12 cases. Both the large size of the ulnar styloid fracture (50-99%; 10 cases, ≥100%; 2 cases) and its severe displacement (<2㎜; 3cases, ≥2㎜; 9 cases) at the time of injury have more instability than minimal size and displacement. The communition of the distal radius fracture was significantly related DRUJ instability, C3 type 7 cases on 6 cases(85.7%). but, involvement of the radiocarpal articular surface did not generate significant difference in the incidence of DRUJ instability, Conclusion: The fracture at the base of ulnar styloid and significant displacement of an ulnar styloid fracture were found to increase the risk of DRUJ instability.