PMID: 9529937Apr 8, 1998Paper

Discrepancy between penetration depths derived from radiographic and direct measurement of acetabular components

Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine
R M HallB M Wroblewski

Abstract

The most common technique for assessing penetration due to wear in acetabular components is with the aid of the most recent serial radiograph. This approach, which is often termed the uni-radiographic method, has been shown to underestimate the more reliable value of the penetration depth deduced from direct measurement of explanted sockets. In this article the causes of the discrepancies between the two data sets are explored. Ninety-six sockets were available from revision surgery for which both the penetration depth and angle could be measured using the shadowgraphic technique in both the coronal and wear planes. Further, the penetration depth for each of the sockets was also assessed from pre-revision X-rays. A significant discrepancy was observed between the penetration depths measured in the wear plane of the replica delta Pw and that measured from the radiograph, delta PX-ray. The discrepancy was greatest for loose sockets as opposed to those that were still fixed at revision surgery. Using the corresponding data from the shadowgraph measurements, it was possible to deduce that the errors have arisen from the radiographic measurement of wear in the coronal plane and the formula used in calculating delta PX-ray. If these ...Continue Reading

References

Nov 1, 1985·The Journal of Bone and Joint Surgery. British Volume·B M Wroblewski
Oct 1, 1994·The Journal of Arthroplasty·A B BankstonP M Faris
Feb 1, 1994·Acta Orthopaedica Scandinavica·W H Harris
Aug 1, 1993·The Journal of Arthroplasty·A Ohlin, G Selvik
Mar 1, 1993·The Journal of Bone and Joint Surgery. British Volume·J M KaboH C Amstutz
Jan 1, 1996·Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine·R M HallB M Wroblewski
Jan 1, 1995·Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine·R M HallB M Wroblewski

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Citations

Nov 6, 1998·Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine·R M HallB M Wroblewski
Jan 16, 2008·Clinical Orthopaedics and Related Research·Sophie WilliamsJohn Older

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