26dkou062 10.3205/26dkou062 urn:nbn:de:0183-26dkou0622 Meeting Abstract Öttl Öttl Felix Conrad FC

Universitätsklinik Balgrist, Zürich, Schweiz

author Dimitriou Dimitriou Dimitris D

Universitätsklinik Balgrist, Zürich, Schweiz

author Zingg Zingg Patrick P

Universitätsklinik Balgrist, Zürich, Schweiz

author Hoch Hoch Patrick P

Universitätsklinik Balgrist, Zürich, Schweiz

author German Medical Science GMS Publishing House

Düsseldorf

610 20261020 engl This is an Open Access article distributed under the terms of the Creative Commons Attribution 4.0 License. Dieser Artikel ist ein Open-Access-Artikel und steht unter den Lizenzbedingungen der Creative Commons Attribution 4.0 License (Namensnennung). M0659 062 Deutsche Gesellschaft für Orthopädie und Unfallchirurgie Deutsche Gesellschaft für Orthopädie und Orthopädische Chirurgie Deutsche Gesellschaft für Unfallchirurgie Berufsverband für Orthopädie und Unfallchirurgie Deutscher Kongress für Orthopädie und Unfallchirurgie (DKOU 2026) Abstracts | Implantatdesign und Primärimplantation der Hüft-TEP Berlin 20261020 20261023 DKOU26_Abs_2096 TextObjectives and questions: The influence of collar design on femoral stem survival in total hip arthroplasty (THA) remains debated despite its potential biomechanical advantages. This registry analysis investigates whether collared stems demonstrate superior survival compared to non-collared designs in primary THA.Material and methods: A retrospective cohort study using the Swiss implant registry (SIRIS) data from 2012 to 2024 was conducted. A total of 168,493 primary THAs performed for osteoarthritis in patients aged ≥50 years were analyzed, comprising 143,427 (85.1%) non-collared and 25,066 (14.9%) collared cementless femoral stems. The primary outcome was revision for aseptic femoral loosening, with all-cause revision as a secondary outcome. Kaplan-Meier survival analysis and multivariable Cox proportional hazards models were used to assess outcomes up to a 10-year follow-up period, adjusting for age, BMI, sex, ASA score and surgical approach.Results: At 10 years, collared stems demonstrated significantly higher survival rates for both aseptic femoral loosening (99.3%, 95% CI 99.1–99.6% vs. 98.9%, 95% CI 98.9–99.0%, p < 0.001) and all cause revision (96.8%, 95% CI 96.4–97.3% vs. 95.3%, 95% CI 95.2–95.5%, p < 0.001). After adjusting for confounders, collared stems were associated with a 42% reduced risk of revision for aseptic loosening (HR 0.56, 95% CI 0.42-0.75) and a 37% reduced risk of all cause revision (HR 0.63, 95% CI 0.57–0.7) compared to non-collared stems.Discussion and conclusions: This large-scale registry analysis provides compelling evidence that collared femoral stems are associated with significantly lower rates of both aseptic loosening and all cause revision risk in THA. These findings suggest that collared stems may represent a favorable option for improving long-term outcomes in primary THA for osteoarthritis, though future research incorporating radiological assessment and patient reported outcomes would further enhance our understanding of this design feature's clinical impact.Table 1 Table 2 11

Table 1

22

Table 2

2 0 0 0