Research article
Ultrasound properties of articular cartilage in the tibio-femoral joint in knee osteoarthritis: relation to clinical assessment (International Cartilage Repair Society grade)
Arthritis Research & Therapy 2008, 10:R78 doi:10.1186/ar2452
See related editorial by Zheng and Huang, http://arthritis-research.com/content/10/6/125 and related letter by Kuroki et al., http://arthritis-research.com/content/11/3/408
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