Closed reduction followed by percutaneous fixation of acute femoral neck fractures in young adults: a retrospective cohort study.

OBJECTIVES To evaluate the surgical outcomes of femoral neck fractures (FNF) in young adults treated with a closed reduction technique as it pertains to reduction quality, rates of union and risk factors for complication. METHODS Design: Retrospective cohort study with radiograph and electronic medical record review. SETTING Level 1 Swiss Trauma center. PATIENT SELECTION CRITERIA Between 2012 and 2021, young adults with isolated FNF (AO/OTA 31-B1) treated with percutaneous screw fixation were selected. Exclusion criteria were open reduction technique, age over 65 or under 16, pathologic fractures, associated femoral head or shaft fractures. OUTCOME MEASURES AND COMPARISONS Primary outcome was quality of reduction, as assessed by three experienced trauma surgeons' evaluation of, intraoperative and/or first postoperative radiographs using the overall impression, the Garden's alignment index, and Lowell`s criteria. Additionally, clinical outcomes, conversion to arthroplasty and complications following closed reduction and fixation of femoral neck fractures was reviewed. RESULTS A total of 54 patients with a median (IQR) age of 57.5 (48-60) years were included. Among them, 22 (41%) were female and 32 (59%) were male. The closed reduction technique demonstrated satisfactory reduction results in up to 87% of cases. Major complications occurred in 19%, with 17% requiring conversion to total hip arthroplasty. Unacceptable or borderline acceptable reduction quality correlated significantly with the need for later conversion (p=0.03). CONCLUSIONS The study supported the use of the closed reduction technique for acute FNF in patients under 65, achieving satisfactory reduction results in up to 87% of cases with comparable complication rates to treatment of young femoral neck fractures with open reduction. Furthermore, it underscored the significance of the surgeon's overall impression of reduction quality, alongside the established reduction criteria, the Garden alignment index and Lowell's criteria, in evaluating the quality of the reduction. Additionally, risk of conversion to total hip arthroplasty was associated with worse closed reduction quality. LEVEL OF EVIDENCE Therapeutic Level III. See Instructions for Authors for a complete description of levels of evidence.