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Published in: BMC Musculoskeletal Disorders 1/2010

Open Access 01-12-2010 | Research article

Association between expression of the Bone morphogenetic proteins 2 and 7 in the repair of circumscribed cartilage lesions with clinical outcome

Authors: Hagen Schmal, Philipp Niemeyer, Jörn Zwingmann, Fabian Stoffel, Norbert P Südkamp, Alexander T Mehlhorn

Published in: BMC Musculoskeletal Disorders | Issue 1/2010

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Abstract

Background

Although there is much known about the role of BMPs in cartilage metabolism reliable data about the in vivo regulation in natural and surgically induced cartilage repair are still missing.

Methods

Lavage fluids of knee joints of 47 patients were collected during surgical therapy. 5 patients had no cartilage lesion and served as a control group, the other 42 patients with circumscribed cartilage defects were treated by microfracturing (19) or by an Autologous Chondrocyte Implantation (23). The concentrations of BMP-2 and BMP-7 were determined by ELISA. The clinical status was evaluated using the IKDC Score prior to and 1 year following the operation.

Results

High level expression in the control group was found for BMP-2, concentrations of BMP-7 remained below detection levels. No statistical differences could be detected in concentrations of BMP-2 or BMP-7 in the lavage fluids of knees with cartilage lesions compared to the control group. Levels of BMP-7 did not change after surgical cartilage repair, whereas concentrations of BMP-2 statistically significant increased after the intervention (p < 0.001). The clinical outcome following cartilage regenerating surgery increased after 1 year by 29% (p < 0.001). The difference of the IKDC score after 1 year and prior to the operation was used to quantify the degree of improvement following surgery. This difference statistically significant correlated with initial BMP-2 (R = 0.554, p < 0.001) but not BMP-7 (R = 0.031, n.s.) levels in the knee joints.

Conclusions

BMP-2 seems to play an important role in surgically induced cartilage repair; synovial expression correlates with the clinical outcome.
Appendix
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Metadata
Title
Association between expression of the Bone morphogenetic proteins 2 and 7 in the repair of circumscribed cartilage lesions with clinical outcome
Authors
Hagen Schmal
Philipp Niemeyer
Jörn Zwingmann
Fabian Stoffel
Norbert P Südkamp
Alexander T Mehlhorn
Publication date
01-12-2010
Publisher
BioMed Central
Published in
BMC Musculoskeletal Disorders / Issue 1/2010
Electronic ISSN: 1471-2474
DOI
https://doi.org/10.1186/1471-2474-11-170

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