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Purpose: The purpose of this study was to compare the clinical and radiological results of patients with fifth metacarpal neck fractures using different sizes and numbers of Kirschner wires (K-wire).Methods: A single institutional retrospective review identified 67 patients with a fifth metacarpal neck fracture between January 2015 and July 2020. The minimum follow-up time was 6 months and they were all treated within 6.4 days of the initial injury. Either one K-wire (1.6 mm), two K-wires (1.1 mm), or three K-wires (0.9 mm) was used. We analyzed the bone union period, and K-wire removal period, duration of surgery, total active motion, intramedullary diameter, pre/postoperative shortening, and pre/postoperative angulation clinically. We used a Method of Shortening Stipulated to measure shortening and the Medullary Canal-lateral view method for angulation. The intramedullary diameter was measured in the mid-shaft of the fifth metacarpal bone in the coronal view. Total active motion was measured at the time of follow-up in our outpatient department.Results: Clinical and radiological parameters showed no statistically significant differences. Even though it did not present a statistical significance, the absolute mean duration of surgery was the shortest in a single K-wire group. Conclusion: The clinical and radiological outcomes of surgery were comparable regardless of the number of K-wires inserted. However, we could look forward to gaining potential benefit from shortened operation time in a single K-wire group. Since stable fixation can be obtained even if one K-wire is used, inserting one thick K-wire into the intramedullary canal can be an alternative according to the surgeon’s preference.

archives of hand and microsurgery

Comparison of Results Based on the Number of Kirschner Wires of Different Diameters in Antegrade Intramedullary Fixation of Fifth Metacarpal Neck Fractures