Corroboration of coupled musculoskeletal model and finite element predictions with in-vivo RSA migration of an uncemented acetabular component.

While finite element (FE) models have been used extensively in orthopaedic studies, validation of their outcome metrics has been limited to comparison against ex vivo testing. The aim of this study was to validate FE model predictions of the initial cup mechanical environment against patient-matched in vivo measurements of acetabular cup migration using radiostereometric analysis (RSA). Tailored musculoskeletal and FE models were developed using a combination of three-dimensional motion capture data and clinical CT scans for a cohort of eight individuals who underwent primary total hip replacement and were prospectively enrolled in an RSA study. FE models were developed to calculate the mean modulus of cancellous bone, composite peak micromotion (CPM), composite peak strain (CPS) and percentage area of bone ingrowth. The RSA cup migration at three months was used to corroborate the FE output metrics. Qualitatively, all FE predicted metrics followed a similar rank order as the in vivo RSA 3D migration data. The two cases with the lowest predicted CPM (<20µm), lowest CPS (<0.0041) and high bone modulus (>917 MPa) were confirmed to have the lowest in vivo RSA 3D migration (<0.14mm). The two cases with the largest predicted CPM (>80µm), larger CPS (>0.0119) and lowest bone modulus (<472MPa) were confirmed to have the largest in vivo RSA 3D migration (>0.78mm). This study enabled the first corroboration between tailored musculoskeletal and FE model predictions with in vivo RSA cup migration. Investigation of additional patient-matched CT, gait and RSA examinations may allow further development and validation of FE models. This article is protected by copyright. All rights reserved.