A biomechanical analysis of low back pain

doi:10.3969/j.issn.2095-4344.2848

Abstract

Abstract:

BACKGROUND: Low back pain is a disease that is very easy to occur in human beings. The causes are complex, and the pathogenesis is still not fully elucidated.

OBJECTIVE: To make a detailed mechanical analysis of the causes of lower back pain.

METHODS: Based on the principle of biomechanics, the 3D mechanical simulation of L₄ and its small joints on both sides was carried out by using Matlab and Photoshop. The slip force of L₃-L₄ intervertebral disc when people with different body masses bend at different angles and extract different weights, and the percentage of stress transferred to the joint capsule in different degrees of disc degeneration were analyzed.

RESULTS AND CONCLUSION: (1) The pressure on L₄when it bends to move the object can decrease nonlinearly with the increase of the bending angle. The greater the bending angle, the smaller the pressure on L4 is. When stooping to carry goods, the pressure on L₄ is directly proportional to the mass of human body or goods. (2) When a person bends down to 75°, the strength of psoas major muscle can be 20 times of the body weight due to the generation of circular stress, and the same repeated action can make the muscle fatigue, and then cause damage. The degeneration of the intervertebral disc can enlarge the stress of the surrounding tissues by about four times, and cause stress injury to these tissues.

Key words: bone, low back pain, mechanics, psoas major muscle, circular stress, intervertebral disc, slip stress

CLC Number:

Young Lihjier, Ouyang Lin, Chen Dingwei, Lin Qi. A biomechanical analysis of low back pain[J]. Chinese Journal of Tissue Engineering Research, 2020, 24(33): 5267-5271.

Figures/Tables 15

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