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Investigating the effects of surgical approach on the outcome of Total Hip Arthroplasty

Whatling, Gemma Marie ORCID:, Holt, Catherine Avril ORCID:, Jones, L., Madete, June Kazira, Dabke, Harshad Vasuded, Alderman, Phillip Martyn and Roberts, P. 2006. Investigating the effects of surgical approach on the outcome of Total Hip Arthroplasty. Journal of biomechanics 39 (S1) , S121.

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Hip replacement is a common procedure known to improve quality of life and gait. However postoperatively, gait does not return to normal and it is thought that differing surgical methods may contribute to the extent to which normal gait is achieved. The two main surgical approaches involve either posterior or lateral incisions; affecting different muscular structures surrounding the hip joint. These two approaches have been compared to investigate their effects on postoperative gait. A Dempster-Shafer (DS) classifier was developed to identity the important kinetic and kinematic variables and classify the two groups of patients. 3D motion analysis was performed postoperatively for walking and Trendelenburg tests using QTM Software, Proreflex cameras (Qualisys, Sweden), and Bertec force platforms (Bertec Corporation). Motion data was analysed using a Visual3D 3.34 (C-Motion Inc) biomechanical model of the lower limbs. Joint rotations were defined using a Cardan/Euler sequence and inverse dynamic analysis was used to calculate internal joint moments. This model was subsequently used for 3D kinematic and kinetic analysis. Paired and independent-sample t-tests (SPSS 12.0.2) were applied to the results obtained for 10 subjects to compare: (i) the two approaches and (ii) the operated and non operated leg. This preliminary analysis highlighted several salient parameters including frontal moments, pelvic obliquity and range of motion of the hip joint and pelvis. The gait data from 35 subjects was then analysed using a modified DS based classifier, developed previously to characterise normal and osteoarthritic knee function [Jones 2006]. The value of this generic classifier was explored in terms of providing an objective and visual indicator of postoperative THA recovery and surgical efficacy following lateral and posterior approaches.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Engineering
Additional Information: Abstracts of the 5th World Congress of Biomechanics
Publisher: Elsevier
ISSN: 0021-9290
Last Modified: 03 Feb 2023 07:24

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