1. Patient Specific Component Alignment in Total Hip Arthroplasty
- Author
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Andrew Shimmin, J Bare, Brad Miles, S McMahon, L Walter, Michael Solomon, Rob Molnar, Andrew Ellis, Catherine Stambouzou, E. Marel, Jim Pierrepont, and Peter Bede O'connor
- Subjects
Economics and Econometrics ,Engineering ,medicine.medical_specialty ,Positioning system ,medicine.medical_treatment ,Total hip replacement ,Kinematics ,Hip replacement (animal) ,03 medical and health sciences ,0302 clinical medicine ,Physical medicine and rehabilitation ,lcsh:Orthopedic surgery ,Component (UML) ,Materials Chemistry ,Media Technology ,medicine ,Component alignment ,Instrumentation (computer programming) ,030222 orthopedics ,business.industry ,Total Hip, Arthroplasty, Implant Positioning ,Forestry ,Arthroplasty ,lcsh:RD701-811 ,business ,030217 neurology & neurosurgery ,Biomedical engineering - Abstract
Appropriate component alignment is critical for reducing instability, maximising bearing performance and restoring native anatomy after Total Hip Replacement (THR). Due to the large variation in patient kinematics between functional activities, current technologies lack definition of what constitutes correct target alignment. Analysis of a large series of symptomatic THR patients confirm that apparently well-orientated components on standard radiographs can still fail due to functional component malalignment. Evidently, previously defined “safe zones” are not appropriate for all patients as they don’t consider the dynamic behaviour of the hip joint.The Optimized Positioning SystemTM (OPSTM) comprises preoperative planning based on a patient-specific dynamic analysis, and patient-specific instrumentation for delivery of the target component alignment. This paper presents the application of OPSTM in three case studies.
- Published
- 2016
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