Volume 19, Issue 6 pp. 1105-1112
Article
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Integrative cartilage repair: adhesive strength is correlated with collagen deposition

Michael A. Dimicco

Michael A. Dimicco

Department of Bioengineering and Institute for Biomedical Engineering, University of California, San Diego, 9500 Gilman Drive, Mail Code 0412, La Jolla, CA 92093-0412, USA

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Robert L. Sah

Corresponding Author

Robert L. Sah

Department of Bioengineering and Institute for Biomedical Engineering, University of California, San Diego, 9500 Gilman Drive, Mail Code 0412, La Jolla, CA 92093-0412, USA

Department of Bioengineering and Institute for Biomedical Engineering, University of California, San Diego, 9500 Gilman Drive, Mail Code 0412, La Jolla, CA 92093-0412, USA, Tel.: +1-858-534-0821; fax: +1-858-534-6896Search for more papers by this author
First published: 01 January 2006
Citations: 75

Abstract

Procedures to repair focal articular cartilage defects often result in poor integration between the host cartilage and the graft tissue, and this may be related to the lack of matrix deposition and the death of chondrocytes near a cut cartilage surface. The objective of this study was to determine if cartilage repair was related to deposition of newly synthesized collagen. The mechanical integration that occurred between two live adult bovine cartilage blocks cultured in partial apposition for two weeks was correlated with [3H]proline incorporation, a measure of protein synthesis, of which more than 66% was accounted for by collagen. A similar level of mechanical integration occurred in sample pairs consisting of a live and killed cartilage block, and this adhesive strength was also correlated with [3H]proline deposition into both the live and the killed blocks. In these samples, the [3H]proline deposited into the killed cartilage appeared to originate from chondrocytes in the live cartilage, since live cells were not detected in the killed cartilage block by either viability staining or [35S]sulfate incorporation. These results suggest a mechanism of integrative cartilage repair in which live chondrocytes within cartilage secrete matrix molecules that are components of a collagen network, and subsequent deposition of these molecules near the repair interface contributes to functional integration. © 2001 Orthopaedic Research Society. Published by Elsevier Science Ltd. All rights reserved.

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