Evaluating clinical outcomes of the new femoral neck system (DePuy Synthes)

Abstract text (incl. references and figure legends)

Introduction The recently introduced Femoral Neck System (FNS)(DePuy Synthes, Zuchwil, Switzerland) is developed for dynamic fixation with rotational stability of a fracture of the femoral neck. Question is what clinical outcomes of FNS placement in a large patient cohort after 6months of follow-up are.

Methods For this cohort study data was extracted from a prospective hip fracture database. Patients receiving an FNS in a level II trauma teaching hospital between 1 January 2018 and 13 May 2021 were included. Follow-up duration was at least 6months.

Results A total of n=81 patients were included, with a median age of 67years with a female gender in n=45(56%) and had most frequently an ASA-score of 1 or 2 (n=52(61%)). The FNFs were non-displaced fractures in n=61 patients (75%) and in n=9 patient (11%) Pauwels type I, in n=42(52%) type II and in n=30(37%) type III. Time to surgery was 17hours(IQR 10–21) and surgery time was 34minutes(IQR 28–41). In n=6(7%) patients avascular necrosis of the femoral head was diagnosed after six months of follow-up. No significant baseline differences were found between patients who developed AVN and patients without this complication.

Conclusion Early results appear to show that the FNS can be a safe alternative for dynamic osteosynthesis with rotational stability of a FNF.

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