Subtrochanteric femur fractures present significant treatment challenges. The deforming muscle forces make fracture reduction difficult. Treatment options include cephalomedullary nailing and various types of plate fixation. There is a high rate of treatment complications, including malunion, delayed union, nonunion, and implant failure.

Background: Distal tibia shaft fractures have a high risk of mal-alignment when treated with intramedullary nailing (IMN). Permanent blocking screws (BSs) and temporary blocking pins (BPs) are often used as supplements to help IMN get good alignment. The purpose of this study was to compare the clinical and radiographic outcomes of temporary BPs and permanent BSs for distal tibia shaft fractures.Methods: From March 2014 to May 2019, a total of 89 patients with distal tibia shaft fractures were included in this retrospective study and divided into two groups. All fractures were located below the isthmus but 4 cm above the tibial plafond. The differences in operating time, intraoperative bleeding, fibula plate fixation, number of BP/BS, initial and final alignment, loss of reduction, fracture healing time, and postoperative complications were analyzed. Functional outcomes of the ankle were assessed with the American Orthopedic Foot and Ankle Society (AOFAS) score.Results: All patients underwent a minimum follow-up of 13 months. The operating time was (73.9±6.1) min and (80.2±8.6) min in the BP group and BS group, respectively (P < 0.05); intraoperative bleeding was (88.2±18.0) mL and (92.9±26.6) mL, respectively (P > 0.05); initial reduction deformity in coronal plane was (0.5±2.3) degrees and (0.9±2.3) degrees, respectively (P > 0.05); final alignment deformity in coronal plane was (1.2±2.7) degrees and (1.3±2.4) degrees, respectively (P > 0.05); initial reduction deformity in sagittal plane was (0.6±2.2) degrees and (0.6±2.4) degrees, respectively (P > 0.05); final alignment deformity in sagittal plane was (0.9±2.3) degrees and (1.0±2.2) degrees, respectively (P > 0.05); As for the loss of reduction, there was no significant difference in sagittal plane between the two groups(P > 0.05). Although the loss of reduction in the coronal plane of the BP group (0.8±0.7 degrees) is statistically higher than that of the BS group (0.5±0.5 degrees), the small difference was not clinically important (P < 0.05). No significant differences were found between the two groups in fracture healing time, AOFAS score and complications (P > 0.05).Conclusion: Both temporary BP and permanent BS can help achieve equivalent overall alignment. However, BP technique is simpler and takes less time.

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