title: Effect of femoral neck modularity upon the prosthetic range of motion in total hip arthroplasty.
abstract: In total hip arthroplasty, aseptic loosening and dislocation are associated with not being able to achieve the correct prosthetic component orientation. Femoral neck modularity has been proposed as a solution to this problem by allowing the surgeon to alter either the neck-shaft or version angle of the prosthetic femoral component intra-operatively. A single replicate full factorial design was used to evaluate how effective a modular femoral neck cementless stem was in restoring a healthy prosthetic range of motion in comparison with a leading fixed-neck cementless stem with the standard modular parameters. It was found that, if altered to a large enough degree, femoral neck modularity can increase the amount of prosthetic motion as well as alter its position to where it is required physiologically. However, there is a functional limit to the amount that can be corrected and there is a risk with regard to the surgeon having to select the optimum modular neck before any benefit is realised.
authors: WMG, The University of Warwick, Coventry, CV4 7AL, UK, glen.turley@warwick.ac.uk.
authors: Glen A
authors: GA
authors: Turley
authors: Damian R
authors: DR
authors: Griffin
authors: Mark A
authors: MA
authors: Williams
mesh_terms: D019644:Arthroplasty, Replacement, Hip; D005272:Femur Neck / Q000502:physiology*; D006801:Humans; D021621:Imaging, Three-Dimensional; D016059:Range of Motion, Articular / Q000502:physiology*