25dkou021 10.3205/25dkou021 urn:nbn:de:0183-25dkou0213 Meeting Abstract Beckers Beckers Gautier G

Department of Orthopaedics and Trauma Surgery, Musculoskeletal University Center Munich (MUM), University Hospital, LMU Munich, Munich, Deutschland

author Hoffmann Hoffmann Julia J

Department of Orthopaedics and Trauma Surgery, Musculoskeletal University Center Munich (MUM), University Hospital, LMU Munich, Munich, Deutschland

author Arnholdt Arnholdt Jörg J

Department of Orthopaedics and Trauma Surgery, Musculoskeletal University Center Munich (MUM), University Hospital, LMU Munich, Munich, Deutschland

author Lerchenberger Lerchenberger Maximilian M

Department of Orthopaedics and Trauma Surgery, Musculoskeletal University Center Munich (MUM), University Hospital, LMU Munich, Munich, Deutschland

author Holzapfel Holzapfel Boris B

Department of Orthopaedics and Trauma Surgery, Musculoskeletal University Center Munich (MUM), University Hospital, LMU Munich, Munich, Deutschland

author Simon Simon Dominic D

Department of Orthopaedics and Trauma Surgery, Musculoskeletal University Center Munich (MUM), University Hospital, LMU Munich, Munich, Deutschland

author German Medical Science GMS Publishing House

Düsseldorf

610 20251031 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). M0634 021 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 2025) Poster | Hüft- und Beckenchirurgie Berlin 20251028 20251031 AB12-4534 TextObjectives and questions: The selection of femoral head size in total hip arthroplasty (THA) plays a crucial role in achieving optimal joint stability and biomechanics. Recent studies suggest that shorter heads (S/M) are typically preferred to minimize complications associated with longer heads. This study aimed to evaluate whether transitioning from a Corail-like cementless stem to a different system results in greater variability in femoral head length selection during THA for high-volume surgeons.Material and methods: A retrospective study was conducted on patients who underwent uncemented THA via the Direct Anterior Approach for primary indications between 2021 and 2023 at an academic institution. Patients were categorized based on the stem system used: Group 1 (A familiar Corail-like stem routinely used by the surgeon), Group 2 (first six months following the switch to another system), and Group 3 (subsequent cases after the transition period). The primary outcome was the variance in femoral head length selection across groups. Femoral heads were categorized as short (small or medium, S/M) or long (large, extra-large, or extra-extra-large, L/XL/XXL), and statistical analyses were performed to compare variability across groups.Results: A total of 289 patients were included in the study. Baseline characteristics did not differ significantly among the three groups (Table 1 ). The distribution of femoral head sizes was as follows:Group 1:85 S/M; 28 L/XL/XXL; variance = 0.1881Group 2:57 S/M; 25 L/XL/XXL; variance = 0.2145Group 3:73 S/M; 21 L/XL/XXL; variance = 0.1754Levene’s test p-value:0.454Levene’s test confirmed no significant difference in variance across groups.Discussion and conclusions: Transitioning between uncemented stem systems did not result in increased variability in femoral head size selection. Experienced surgeons maintained consistent positioning of the rasp and implant, regardless of the stem system used. These findings suggest that femoral head length selection remains stable when switching between stem systems, reinforcing the reliability of intraoperative decision-making. 11

Table 1: Patient demographicsMean (SD); n (%)

1 0 0 0