Abstract
Flexion following arthroplasty of the hip is important for activities of daily living. Studies have highlighted a possible reduction in flexion following Metal-on-Metal Hip Resurfacing Arthroplasty (MoMHRA) but failed to account for inter-subject variability and the possible etiology for this reduction. This in vivo study aims to determine whether flexion is restored following MoMHRA and identify factors that influence it. Charnley Class A patients (n=112) that underwent MoMHRA were reviewed in a dedicated clinic assessing flexion (resurfaced and contra-lateral hips) and outcome. The difference in flexion between both hips was defined as flexion deficit (δflexion). Various patient (age, gender, BMI) and surgical (component orientation, size, head-neck-ratio, offset) factors were examined in terms of their effect on δflexion. MoMHRA-hips had significantly reduced flexion as compared to the native hips. This flexion-deficit correlated with contra-lateral maximum flexion, component size, head-neck-ratio and component orientation. The findings demonstrate that flexion following MoMHRA is strongly correlated to but is reduced in comparison to the native, disease-free, hip flexion. Surgical practice can minimise flexion-deficit and optimise function.
Hip Int 2012; 22(3): 266 - 273
Article Type: ORIGINAL RESEARCH ARTICLE
DOI:10.5301/HIP.2012.9280
Authors
George Grammatopoulos, Andrew Philpott, Kathleen Reilly, Hemant Pandit, Karen Barker, David W. Murray, Harinderjit S. Gill
Article History
- • Accepted on 06/03/2012
- • Available online on 28/06/2012
- • Published in print on 10/07/2012
This article is available as full text PDF.
Authors
- Grammatopoulos, George
[PubMed]
[Google Scholar]
Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences, University of Oxford, Botnar Research Centre, Nuffield Orthopaedic Centre, Oxford - UK
- Philpott, Andrew
[PubMed]
[Google Scholar]
Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences, University of Oxford, Botnar Research Centre, Nuffield Orthopaedic Centre, Oxford - UK
- Reilly, Kathleen
[PubMed]
[Google Scholar]
Nuffield Orthopaedic Centre, Oxford - UK
- Pandit, Hemant
[PubMed]
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Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences, University of Oxford, Botnar Research Centre, Nuffield Orthopaedic Centre, Oxford - UK; and Nuffield Orthopaedic Centre, Oxford - UK
- Barker, Karen
[PubMed]
[Google Scholar]
Nuffield Orthopaedic Centre, Oxford - UK
- Murray, David W.
[PubMed]
[Google Scholar]
Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences, University of Oxford, Botnar Research Centre, Nuffield Orthopaedic Centre, Oxford - UK; and Nuffield Orthopaedic Centre, Oxford - UK
- Gill, Harinderjit S.
[PubMed]
[Google Scholar]
Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences, University of Oxford, Botnar Research Centre, Nuffield Orthopaedic Centre, Oxford - UK
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