Chinese Journal of Tissue Engineering Research ›› 2020, Vol. 24 ›› Issue (14): 2133-2139.doi: 10.3969/j.issn.2095-4344.2246

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Ratcheting behavior of adult and juvenile cartilage under rolling load

Li Kai1, 2, Du Yuxue3, Gao Lilan1, 2, Zhang Chunqiu1, 2, Sun Dongdong4   

  1. 1Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control; 2National Demonstration Center for Experimental Mechanical and Electrical Engineering Education; 3School of Mechanical and Electrical Engineering and Automation; 4Department of Orthopedics, Characteristic Medical Center of the Chinese people's Armed Police Force
  • Received:2019-06-18 Revised:2019-06-21 Accepted:2019-08-07 Online:2020-05-18 Published:2020-03-13
  • Contact: Gao Lilan, MD, Professor, Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control, School of Mechanical Engineering, Tianjin University of Technology, Tianjin 300384, China; National Demonstration Center for Experimental Mechanical and Electrical Engineering Education (Tianjin University of Technology), Tianjin 300384, China
  • About author:Li Kai, Master candidate, Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control, School of Mechanical Engineering, Tianjin University of Technology, Tianjin 300384, China; National Demonstration Center for Experimental Mechanical and Electrical Engineering Education (Tianjin University of Technology), Tianjin 300384, China
  • Supported by:
    the National Natural Science Foundation of China, No. 11572222, No. 11672208, No. 11432016

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Abstract:

BACKGROUND: Domestic and foreign scholars have done a lot of researches on the stress of articular cartilage under different mechanical environments and cyclic compressive loads, but they mainly studied the effect of cartilage under the cyclic compressive load. Studies on the effects of age factor on the mechanical properties of cartilage and studies regarding the properties of cartilage in complex stress environments are not exhaustive.

OBJECTIVE: To investigate the effects of different rolling load conditions on the ratcheting behavior of adult and juvenile articular cartilage.

METHODS: Adult cartilage and juvenile cartilage were used as experimental objects, and the load was applied by a rolling load device under different experimental conditions (compression: 10%, 20%, 30%; rolling rate: 1.66, 3.44, 6.68 mm/s; defect width: 1, 2, 4 mm). At the same time, non-contact digital technology was used to collect the sample during the loading process, and the cyclical pressure was studied by analyzing and processing the image. The ratcheting behavior of adult and juvenile articular cartilage was studied under rolling load. 

RESULTS AND CONCLUSION: Under rolling load, the ratcheting strain of adult cartilage and juvenile cartilage showed a rapid increase followed by a slow increase tendency with the rolling load. With the increase of compression, the ratcheting strain of adult cartilage and juvenile cartilage increased. At the same amount of compression, the ratcheting strain of juvenile cartilage was greater than that of adult cartilage, and their ratcheting strain gradually decreased from the surface layer to the deep layer along the depth of cartilage. As the rolling rate increased, the ratcheting strain of adult cartilage and juvenile cartilage decreased. The ratcheting strain values and trends of 1 mm microdefect articular cartilage were similar to those of intact articular cartilage. Under the condition of 2, 4 mm defect, the ratcheting strain value of the defected cartilage was higher than that of the intact cartilage.

Key words: articular cartilage, rolling load, defect size, cartilage layer area, ratcheting strain, ratcheting strain rate, different rolling rates, different compression amounts

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