Effect of Pelvic Tilt on Radiographic Migration and Wear Measurements after Total Hip Arthroplasty

Author:

Ilchmann T.1,Kesteris U.2,Wingstrand H.2

Affiliation:

1. BG Trauma Centre, University of Tübingen, Tübingen - Germany

2. Department of Orthopaedics, University Hospital, Lund - Sweden

Abstract

Tilt effects on radiographic measurements after total hip arthroplasty should be studied. A new computerized method for measurement, called EBRA, making three-dimensional calculations and intended to identify tilted radiographs was evaluated for its clinical usefulness. In an experimental set-up repeated radiographs were taken with a human pelvis tilted gradually around its horizontal and vertical axes. Migration and wear were measured with the EBRA method and the results were compared with those made using standard methods. Tilted radiographs were identified and excluded from analysis by the EBRA method, significantly reducing the maximum error of measurement. A systematic error of measurement was found in the presence of consecutively changing tilt in a single direction. Wear measurements were only slightly affected by pelvic tilt. A pelvic tilt can cause considerable errors in the measurement of cup migration-i.e. up to 8.2 mm. The EBRA method improves the accuracy of measurements by taking the effects of tilt into account.

Publisher

SAGE Publications

Subject

Orthopedics and Sports Medicine,Surgery

Cited by 5 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. Femoral Subsidence Assessment After Hip Replacement;Upsala Journal of Medical Sciences;2006-01

2. Severe wear from Retrieved Alumina-on-Alumina Coupled Implant: A Case Report;The International Journal of Artificial Organs;2001-09

3. Fluid absorption study in ultra-high molecular weight polyethylene (UHMWPE) sterilized and unsterilized acetabular cups;Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine;2001-01-01

4. Hip Prothesis: An in Vitro Wear Protocol Based on a Comparison between Gravimetric and Profilometric Analysis;The International Journal of Artificial Organs;1999-04

5. The Repeatability of EBRA in Migration and Wear Analysis;HIP International;1999-01

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