• Masashi Taniguchi, Yoshihiro Fukumoto, Masashi Kobayashi, Taku Kawasaki, Shoji Maegawa, Satoko Ibuki, and Noriaki Ichihashi.
• Division of Physical Therapy, Rehabilitation Units, Shiga University of Medical Science Hospital, Otsu City, Shiga, Japan; Department of Physical Therapy, Graduate School of Medicine, Kyoto University, Kyoto, Japan. Electronic address: masa1030@belle.shiga-med.ac.jp.
• Ultrasound Med Biol. 2015 Oct 1; 41 (10): 2567-74.

AbstractThe objective of the study described here was to compare lower extremity muscle quantity and quality between individuals with and those without knee osteoarthritis (OA). Twenty-one women with knee OA (mild, n = 8; severe, n = 13) and 23 healthy patients participated. Ultrasonography was used to measure muscle thickness (MT) and echo intensity (EI) of the rectus femoris, vastus intermedius, vastus lateralis, vastus medialis, biceps femoris, gluteus maximus, gluteus medius, gastrocnemius, soleus and tibialis anterior. MTs of the vastus medialis and vastus intermedius were smaller, and EIs of the vastus medialis, vastus intermedius, gluteus medius and tibialis anterior were larger, in the severe OA group compared than in the healthy group. Compared with the healthy group, the mild OA group had decreased MT and enhanced EI. Changes in quality and quantity occurring with knee OA progression differed among muscles. In the vastus medialis, change was observed from an earlier stage.Copyright © 2015 World Federation for Ultrasound in Medicine & Biology. Published by Elsevier Inc. All rights reserved.

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