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2022, Vol. 26 ›› Issue (3): 340-343Three-dimensional finite element analysis of Daogaijinbei manipulation on lumbar intervertebral disc biomechanicsLi Yanting1, 2, Chen Jian1, 2, Liu Menglan1, 2, Ren Manman1, 2, Zhong Weihong1, 2, Chen Changxing1, 2
Abstract: BACKGROUND: The South Shaolin technique uses the essence of martial arts in bone and tendon and massage techniques to form a unique Chinese bone injury treatment technique. Research has found that the South Shaolin tendon and chiropractic technique has a significant effect on the treatment of lumbar disc herniation. OBJECTIVE: To analyze the biomechanical effects of Daogaijinbei manipulation on the lumbar intervertebral disc by using the three-dimensional finite element method. METHODS: A healthy young male volunteer was selected to construct a three-dimensional finite element model of the lumbar spine (L1-L5) based on the CT scan results. The stress distribution and variation of lumbar intervertebral disc under different jacking heights were calculated by simulating loading Daogaijinbei manipulation on the validated lumbar spine model. RESULTS AND CONCLUSION: (1) The maximum average stress of each lumbar intervertebral disc was about 9.2 MPa after being pushed by a total displacement of 10 cm in L3, and there was stress concentration in some units of the L4-5 intervertebral disc. (2) With the increase of the jacking height, the stress of each intervertebral disc presented an approximate linear growth trend. The stress values of each intervertebral disc were: 1.36-7.36 MPa in L1-2 intervertebral disc, 1.64-7.82 MPa in L2-3 intervertebral disc, 1.52-9.20 MPa in L3-4 intervertebral disc, and 1.25-8.71 MPa in L4-5 intervertebral disc. The stress distribution was: L3-4 > L4-5 > L2-3 > L1-2. (3) The stress variation of lumbar intervertebral disc increased from nucleus pulposus to the edge, and the maximum stress was in the anterior side of annulus fibrosus. (4) During Daogaijinbei manipulation, the overall stress distribution of the lumbar intervertebral disc is consistent and gradually increasing, which suggests that manipulation should be done little by little to ensure patients’ safety. Key words:Daogaijinbei manipulation, lumbar intervertebral disc, biomechanics, three-dimensional finite element, lumbar model, spinal hyperextension, normal lumbar spine, stress |