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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.

Original publication

DOI

10.5301/HIP.2012.9280

Type

Journal article

Journal

Hip int

Publication Date

05/2012

Volume

22

Pages

266 - 273

Keywords

Adult, Aged, Arthroplasty, Replacement, Hip, Clinical Competence, Female, Hip Joint, Hip Prosthesis, Humans, Male, Metal-on-Metal Joint Prostheses, Middle Aged, Postoperative Complications, Prosthesis Design, Range of Motion, Articular, Recovery of Function, Surveys and Questionnaires