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< Vol. 22 Issue 3 | May-Jun 2012 | pp. 235 - 342

Flexion following hip resurfacing and factors that influence it

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

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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] [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
  • 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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