Fixation of Femoral Neck Fracture with Femoral Neck System : A retrospective cohort study of 43 patients

Introduction: This study aimed to analyze the clinical outcomes of femoral neck fractures (FNF) in patients treated with a femoral neck system (FNS, DePuy Synthes), which is a recently introduced device. Methods: This study included 43 patients who underwent osteosynthesis using FNS for with a minimum follow-up of 6 months. The researchers examined the patients’ demographic factors and radiologically evaluated the fracture type and fixation status, bone union, and postoperative complications. Results: Radiological bone union was confirmed in 39 patients (90.7%), and the mean time to union was 3.6 months. Two cases of nonunion, one case of lag screw cut-out, and one case of osteonecrosis were confirmed; all four cases later underwent arthroplasty. The mean time to reoperation was 4.5 months. Meanwhile, five patients underwent implant removal after the bone union, and distal locking screw stripping was noted in three patients. All three patients required metal plate cutting to remove the implants. Conclusion: Osteosynthesis of FNF using the newly introduced FNS showed satisfactory outcomes and excellent mechanical stability without any postoperative complications. However, distal locking screw failure during implant removal should also be considered.