Specimen-specific finite element representations of implanted hip capsules

Ahilan Anantha Krishnan, Casey A. Myers, Michael Scinto, Brittany N. Marshall and Chadd W. Clary

Computer Methods in Biomechanics and Biomedical Engineering, 2024, vol. 27, issue 6, 751-764

Abstract: The hip capsule is a ligamentous structure that contributes to hip stability. This article developed specimen-specific finite element models that replicated internal–external (I-E) laxity for ten implanted hip capsules. Capsule properties were calibrated to minimize root mean square error (RMSE) between model and experimental torques. RMSE across specimens was 1.02 ± 0.21 Nm for I-E laxity and 0.78 ± 0.33 Nm and 1.10 ± 0.48 Nm during anterior and posterior dislocation, respectively. RMSE for the same models with average capsule properties was 2.39 ± 0.68 Nm. Specimen-specific models demonstrated the importance of capsule tensioning in hip stability and have relevance for surgical planning and evaluation of implant designs.

Date: 2024
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DOI: 10.1080/10255842.2023.2200878

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