The impact of hip implant alignment on muscle and joint loading during dynamic activities

Clinical Biomechanics
Casey A MyersPaul J Rullkoetter

Abstract

Component alignment is an important consideration in total hip arthroplasty. The impact of changes in alignment on muscle forces and joint contact forces during dynamic tasks are not well understood, and have the potential to influence surgical decision making. The objectives of this study were to assess the impact of femoral head/stem and cup component placement on hip muscle and joint contact forces during tasks of daily living and to identify which alignment parameters have the greatest impact on joint loading. Using a series of strength-calibrated, subject-specific musculoskeletal models of patients performing gait, sit-to-stand and step down tasks, component alignments were perturbed and joint contact and muscle forces evaluated. Based on the range of alignments reported clinically, variation in head/stem anteversion-retroversion had the largest impact of any degree of freedom throughout all three tasks; average contact forces 413.5 (319.1) N during gait, 262.7 (256.4) N during sit to stand, and 572.7 (228.1) N during the step down task. The sensitivity of contact force to anteversion-retroversion of the head/stem was 31.5 N/° for gait, which was similar in magnitude to anterior-posterior position of the cup (34.6 N/m for ...Continue Reading

Citations

Jun 21, 2020·Biomechanics and Modeling in Mechanobiology·Daniel N HuffPaul J Rullkoetter
May 1, 2021·Journal of Orthopaedic Research : Official Publication of the Orthopaedic Research Society·Casey A MyersPaul J Rullkoetter
Dec 21, 2021·Work : a Journal of Prevention, Assessment, and Rehabilitation·Devrim Can SaracBayram Unver

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