Comparison of K-wire versus screw fixation after open reduction of transitional (Tillaux and triplane) distal tibia fractures

Our study aimed to compare the clinical and radiographic outcomes of transitional distal tibia fractures treated with K-wire fixation versus screw fixation after open reduction. A retrospective study was performed on all displaced transitional distal tibia fractures that underwent operative fixation. Following open reduction, surgical fixation was performed using either percutaneously inserted 2.0 mm K-wires, or 4.0 mm partially-threaded cannulated cancellous screws. Clinical and radiographic outcomes between the two groups were assessed using the modified Weber score. Other outcome measures assessed were surgical time, casting duration, follow-up duration and duration before return-to-sports. We recruited 49 patients with transitional distal tibia fractures requiring open reduction and surgical fixation. There were 18 patients in the K-wiring group (KWG), and 31 patients in the screw fixation group (SFG). All patients in both groups had excellent clinical and radiographic outcome based on the modified Weber's scoring, full radiological healing, and no residual displacement upon final follow up. The KWG had significantly shorter surgical time (41.0 min versus 75.1 min, P < 0.0001) and shorter follow-up duration needed before discharge (5.4 months versus 8.7 months, P = 0.024). However, they required a longer post-operative casting duration (7.3 weeks versus 5.3 weeks, P = 0.006). No significant difference was found for the duration before return to sports between both groups. Complications were few in this study group. Superficial pin site infection was noted in one patient in the KWG, and valgus deformity of the ankle was noted in one patient in the SFG. In our study, surgical treatment of transitional distal tibia fractures demonstrated equally excellent outcomes when treated by open reduction with either K-wire or cannulated screw fixation. Level of evidence: III.