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. 2014 Feb 10;15:36. doi: 10.1186/1471-2474-15-36

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Copyright © 2014 Yang et al.; licensee BioMed Central Ltd.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited.

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Sagittal view proton density fast spin echo sequence MR images (TR/TE 4000/30) of operated knee in the with-LIPUS-treatment group. Subchondral bone demonstrated lower signal intensity, while articular cartilage showed intermediate signal intensity and joint fluid showed high signal intensity. (A) Pre-surgery: Intact articular surface of femoral condyle (arrow), and a boundary between joint fluid and articular cartilage were seen. (B) Post-surgery: Cartilage defect showed loss of continued articular surface over femoral condyle (arrow). (C) Post-LIPUS treatment: Proliferative tissue filled the cartilage defect of femoral condyle (arrow). A boundary between joint fluid and proliferative tissue was seen, which presented intermediate signal intensity.