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Article

Effect of passive motion on articular cartilage in rat osteoarthritis

  • Authors:
    • Jie Qian
    • Jun Liang
    • Yubin Wang
    • Huifang Wang
  • View Affiliations / Copyright

    Affiliations: Institution of Life Science and Technology, Tongji University, Shanghai 200092, P.R. China, Department of Sport Medicine, Shanghai East Hospital, Tongji University School of Medicine, Shanghai 200092, P.R. China, Departments of Rehabilitation Medicine, Shanghai East Hospital, Tongji University School of Medicine, Shanghai 200092, P.R. China
  • Pages: 377-383
    |
    Published online on: May 29, 2014
       https://doi.org/10.3892/etm.2014.1746
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Abstract

The aim of the present study was to investigate the effect of moderate passive motion on articular cartilage in osteoarthritis (OA) caused by knee fracture. Sprague‑Dawley rats (age, 8 weeks) with knee fractures were used to construct rat knee early‑ and middle‑stage OA models. The stages were fixed for three and six weeks, with 20 rats analyzed at each stage. The experimental groups were exercised daily for 15 m/min with a specified duration. Following the completion of exercise, the effects of proper passive motion on cartilage thickness, the Mankin rating, cartilage collagen matrix, proteoglycan content and the morphological structure of the cartilage in the rat OA models were measured at the various degenerative stages caused by knee fracture. The proteoglycan content of the cartilage matrix, type II collagen fibers and the number of cartilage cells undergoing apoptosis were semiquantified. For early‑ and middle‑stage OA, the cartilage layers in the three‑ or six‑week experimental groups were significantly thicker and the levels of proteoglycans and type II collagen fibers in the weight‑bearing area of the cartilage were significantly higher when compared with the control groups (P<0.05). In addition, the Mankin ratings were lower and ligament tension was increased when compared with the control group (P<0.05). In the early‑stage OA group, significantly decreased apoptotic rates (P<0.05) were observed in the three‑ and six‑week experimental groups, however, no significant decrease was observed in the middle‑stage OA group. In the early‑stage OA rats, the thickness of the cartilage layer, as well as the levels of proteoglycans and type II collagen fibers, in the six‑week experimental group, were significantly higher compared with the control and three‑week subgroups, and a decreased apoptotic rate was observed (P<0.05). In the six‑week experimental middle‑stage OA group, significant differences were observed in the content of proteoglycans and type II collagen fibers when compared with the control group, but not when compared with the three‑week experimental group. Therefore, proper passive motion can repair and improve the metabolism of chondrocytes and delay the degenerative progress of articular cartilage in OA caused by knee fracture. However, for middle‑stage OA, passive motion exhibits no significant repairing effect on the articular cartilage. This therapy increases the levels of proteoglycans and collagen fibers by reducing their decomposition, thereby improving the strength of the articular ligament and the stability of articulation.
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Copy and paste a formatted citation
Spandidos Publications style
Qian J, Liang J, Wang Y and Wang H: Effect of passive motion on articular cartilage in rat osteoarthritis. Exp Ther Med 8: 377-383, 2014.
APA
Qian, J., Liang, J., Wang, Y., & Wang, H. (2014). Effect of passive motion on articular cartilage in rat osteoarthritis. Experimental and Therapeutic Medicine, 8, 377-383. https://doi.org/10.3892/etm.2014.1746
MLA
Qian, J., Liang, J., Wang, Y., Wang, H."Effect of passive motion on articular cartilage in rat osteoarthritis". Experimental and Therapeutic Medicine 8.2 (2014): 377-383.
Chicago
Qian, J., Liang, J., Wang, Y., Wang, H."Effect of passive motion on articular cartilage in rat osteoarthritis". Experimental and Therapeutic Medicine 8, no. 2 (2014): 377-383. https://doi.org/10.3892/etm.2014.1746
Copy and paste a formatted citation
x
Spandidos Publications style
Qian J, Liang J, Wang Y and Wang H: Effect of passive motion on articular cartilage in rat osteoarthritis. Exp Ther Med 8: 377-383, 2014.
APA
Qian, J., Liang, J., Wang, Y., & Wang, H. (2014). Effect of passive motion on articular cartilage in rat osteoarthritis. Experimental and Therapeutic Medicine, 8, 377-383. https://doi.org/10.3892/etm.2014.1746
MLA
Qian, J., Liang, J., Wang, Y., Wang, H."Effect of passive motion on articular cartilage in rat osteoarthritis". Experimental and Therapeutic Medicine 8.2 (2014): 377-383.
Chicago
Qian, J., Liang, J., Wang, Y., Wang, H."Effect of passive motion on articular cartilage in rat osteoarthritis". Experimental and Therapeutic Medicine 8, no. 2 (2014): 377-383. https://doi.org/10.3892/etm.2014.1746
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