• Manuel Kistler, Arnd Steinbrück, Florian Schmidutz, Alexander C Paulus, Boris Michael Holzapfel, and Matthias Woiczinski.
• Department of Orthopaedics and Trauma Surgery, Musculoskeletal University Center Munich (MUM), University Hospital, LMU, Marchioninistraße 15, 81377, Munich, Germany. Manuel.Kistler@med.uni-muenchen.de.
• Arch Orthop Trauma Surg. 2024 Jun 1; 144 (6): 287328792873-2879.

IntroductionAseptic loosening and periprosthetic fractures are main reasons for revision after THA. Quite different from most other stem systems, Corail cementless hip stems show better survival rates than their cemented counterpart, which can possibly be explained by the use of a collar. The study aimed to investigate primary stability with standard and undersized hip stems both collared and collarless.Materials And MethodsPrimary stability of cementless, collared and collarless, femoral stems was measured in artificial bones using both undersized and standard size. After preconditioning, 3D micromotion was measured under cyclic loading at the bone-implant interface.ResultsThe use of a collar resulted in higher micromotion within the same stem size but showed no statistically significant difference for both standard and undersized hip stems. The collared and collarless undersized stems showed no significant differences in 3D micromotion at the upper measuring positions compared to the standard stem size. Micromotion was significantly higher in the distal measuring positions, with and without collar, for the undersized stems (vs. standard collarless stem size).ConclusionThe key finding is that the collarless and collared Corail hip stems, within one stem size, showed no significant differences in primary stability. Undersized stems showed significantly higher micromotion in the distal area both with and without collar.© 2024. The Author(s).

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