• Carl Mellner, Jabbar Mohammed, Magnus Larsson, Sandra Esberg, Maciej Szymanski, Nils Hellström, Cecilia Chang, Hans E Berg, Olof Sköldenberg, Björn Knutsson, Per Morberg, and Sebastian Mukka.
• Department of Surgical and Perioperative Sciences, Umeå University, Umeå, Sweden. carl.mellner@gmail.com.
• Eur J Trauma Emerg Surg. 2021 Jun 1; 47 (3): 803-809.

BackgroundThe purpose of this study was to compare the cumulative incidence of postoperative periprosthetic fracture (PPF) in a cohort of femoral neck fracture (FNF) patients treated with two commonly used cemented stems: either a collarless, polished, tapered Exeter stem or the anatomic Lubinus SP2 stem.MethodsIn this retrospective multicenter cohort study of a consecutive series of patients, we included 2528 patients of age 60 years and above with an FNF who were treated with either hemiarthroplasty or total hip arthroplasty using either a polished tapered Exeter stem or an anatomic Lubinus SP2 stem. The incidence of PPF was assessed at a minimum of 2 years postoperatively.ResultsThe incidence of PPF was assessed at a median follow-up of 47 months postoperatively. Thirty nine patients (1.5%) sustained a PPF at a median of 27 months (range 0-96 months) postoperatively. Two of the operatively treated fractures were Vancouver A (5%), 7 were Vancouver B1 (18%), 10 were Vancouver B2 (26%), 7 were Vancouver B3 (18%), and 13 were Vancouver C (32%). The cumulative incidence of PPF was 2.3% in the Exeter group compared with 0.7% in the SP2 group (p < 0.001). The HR was 5.4 (95% CI 2.4-12.5, p < 0.001), using the SP2 group as the denominator.ConclusionsThe Exeter stem was associated with a higher risk for PPF than the Lubinus SP2 stem. We suggest that the tapered Exeter stem should be used with caution in the treatment of FNF.Trial RegistrationThe study was registered at clinicaltrials.gov (identifier: NCT03326271).

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