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The objectives of the present study were to determine whether differences in the radiographic appearance of the of the proximal femoral canal exist on corresponding AP pelvis and AP hip radiographs, and whether radiographic assessment of canal shape is accurate with reference to computed tomography (CT). In a retrospective study, corresponding radiographs and CT scans of 100 consecutive patients with primary hip OA were evaluated. Active shape modelling (ASM) was performed to assess the variation in proximal femoral canal shape and to identify differences between AP hip and AP pelvis views. Differences in the medial cortical flare between radiographs and CT were quantified using least squares curve fitting. ASM identified significant differences in the assessment of canal shape on corresponding AP hip and AP pelvis views. Curve fitting demonstrated a good agreement between AP hip radiographs and CT. Agreement between AP pelvis radiographs and CT was less good. In contrast to AP pelvis radiographs, AP hip radiographs allow a more accurate and reliable assessment of proximal femoral canal shape in the frontal plane in primary hip OA. Our findings may improve stem fit in total hip arthroplasty without the routine use of CT.

Original publication

DOI

10.5301/hipint.5000040

Type

Journal article

Journal

Hip international : the journal of clinical and experimental research on hip pathology and therapy

Publication Date

09/2013

Volume

23

Pages

484 - 491

Addresses

Department of Orthopaedic and Trauma Surgery, University Hospital Heidelberg, Heidelberg - Germany and Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences, University of Oxford, Oxford - UK.

Keywords

Pelvis, Femur Head, Humans, Osteoarthritis, Hip, Tomography, X-Ray Computed, Arthroplasty, Replacement, Hip, Retrospective Studies, Reproducibility of Results, Prosthesis Design, Prosthesis Fitting, Aged, Middle Aged, Female, Male