Mechanical effect of oblique-pulling manipulation on triarticular complex after human lumbar intervertebral disc degeneration

doi:10.12307/2023.499

Abstract

Abstract: BACKGROUND: Biomechanical studies on the treatment of lumbar intervertebral disc degeneration by oblique-pulling manipulation mainly focus on the stress and displacement analysis of the annulus fibrosus, nucleus pulposus and bony structure, while mechanical studies on the three-articular complex after lumbar intervertebral disc degeneration have not been found.
OBJECTIVE: To analyze the biomechanical dynamic changes of the three-joint complex after lumbar intervertebral disc degeneration by oblique-pulling manipulation with finite element method.
METHODS: CT images were imported to Mimics, Geomagic Studio, SolidWorks, Hypermesh and other finite element software to construct L4 and L5 vertebral body, intervertebral disc, ligament, joint capsule and other finite element models. According to the different material properties of lumbar disc degeneration, the values were assigned to establish normal, mild and moderate degeneration models. The mechanical distribution differences of the three-joint complex with different degrees of lumbar disc degeneration were analyzed by oblique-pulling manipulation.
RESULTS AND CONCLUSION: (1) After oblique-pulling manipulation, the maximum stresses of normal, mild and moderate degenerative intervertebral discs were 0.78, 3.21, and 3.94 MPa, respectively, while the corresponding maximum displacement of the intervertebral disc gradually decreased. (2) After oblique-pulling manipulation, the annulus fibrosus stress of normal, mild and moderate degenerative intervertebral discs increased gradually, and the annulus fibrosus stress of moderate degenerative intervertebral discs increased significantly. The maximum stresses in the nucleus pulposus of normal, mild and moderate degenerative intervertebral discs were 0.87, 0.56, and 0.44 MPa, and the maximum stretched heights of the joint capsule were 1.74, 2.48, and 3.10 mm, respectively. (3) The results suggest that the normal intervertebral disc without degeneration can reduce the stress loading of the lumbar triarticular complex and play a protective role. Oblique-pulling manipulation of moderate degenerative intervertebral disc is safe, and its maximum stress will not cause damage to lumbar tissue.

Key words: lumbar intervertebral disc degeneration, oblique-pulling manipulation, finite element, triarticular complex, mechanical effect, lumbar spine

CLC Number:

Xu Guangming, Liang Ziyang, Wang Hongbo, Zhang Zhen, Xiao Qinghua, Yang Jiyong, Lin Xiaosheng. Mechanical effect of oblique-pulling manipulation on triarticular complex after human lumbar intervertebral disc degeneration[J]. Chinese Journal of Tissue Engineering Research, 2023, 27(27): 4277-4282.

Figures/Tables 5

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