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Journal of Bone and Joint Surgery - British Volume, Vol 88-B, Issue 1,
19-25.
doi: 10.1302/0301-620X.88B1.16715 Copyright © 2006 by British Editorial Society of Bone and Joint Surgery CT analysis of defects of the cement mantle and alignment of the stemIN VITRO COMPARISON OF CHARNLEY-KERBOUL FEMORAL HIP IMPLANTS INSERTED LINE-TO-LINE AND UNDERSIZED IN PAIRED FEMORAT. Scheerlinck, MD, Orthopaedic Surgeon, Assistant Clinical Professor1; J. de Mey, MD, PhD, Professor of Radiology2; R. Deklerck, PhD, Researcher3; and P. C. Noble, BE, MEng Sci, PhD, John S Dunn Professor of Orthopaedic Research4
1 Department of Orthopaedic Surgery Correspondence should be sent to Dr T. Scheerlinck; e-mail: Thierry.Scheerlinck{at}az.vub.ac.be
Using a modern cementing technique, we implanted 22 stereolithographic polymeric replicas of the Charnley-Kerboul stem in 11 pairs of human cadaver femora. On one side, the replicas were cemented line-to-line with the largest broach. On the other, one-size undersized replicas were used (radial difference, 0.89 mm SD 0.13). CT analysis showed that the line-to-line stems without distal centralisers were at least as well aligned and centered as undersized stems with a centraliser, but were surrounded by less cement and presented more areas of thin (< 2 mm) or deficient (< 1 mm) cement. These areas were located predominantly at the corners and in the middle and distal thirds of the stem. Nevertheless, in line-to-line stems, penetration of cement into cancellous bone resulted in a mean thickness of cement of 3.1 mm (SD 0.6) and only 6.2% of deficient and 26.4% of thin cement. In over 90% of these areas, the cement was directly supported by cortical bone or cortical bone with less than 1 mm of cancellous bone interposed. When Charnley-Kerboul stems are cemented line-to-line, good clinical results are observed because cement-deficient areas are limited and are frequently supported by cortical bone. This article has been cited by other articles:
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