Journal of Shandong University (Health Sciences) ›› 2023, Vol. 61 ›› Issue (6): 70-78.doi: 10.6040/j.issn.1671-7554.0.2022.1102

• 临床医学 • Previous Articles    

Biomechanical effects of different load-carrying ways on lumbar spine

ZHAO Geng1,2, WANG Lianlei2, WANG Hongwei3, LIU Xinyu2   

  1. 1. Key Laboratory of Ultra-Weak Magnetic Field Measurement Technology, Ministry of Education, School of Instrumentation and Optoelectronic Engineering, Beihang University, Beijing 100083, China;
    2. Department of Orthopedics, Qilu Hospital, Cheeloo College of Medicine, Shandong University, Jinan 250012, Shandong, China;
    3. College of Artificial Intelligence and Big Data for Medical Sciences, Shandong First Medical University, Jinan 250102, Shandong, China
  • Published:2023-06-06

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Abstract: Objective Based on the musculoskeletal model and the lumbar finite element model, to investigate the effects of different knapsack models on paraspinal muscle contraction and lumbar intervertebral disc stress distribution in the upright state. Methods The unloaded, backpack, shoulder-bag and handbag musculoskeletal models and finite element model were established. Muscle force and joint compression force were calculated in the musculoskeletal model, and input into the lumbar finite element model to analyze the stress distribution on lumbar spine. Results Compared with that in the unloaded model, average muscle force in the backpack, shoulder-bag and handbag model increased by 31.0%, 43.4% and 105.1%, respectively. The muscle force was balanced between right and left in the backpack model; however, it was higher in the loaded side in the shoulder-bag model, and was higher in the unloaded side in the handbag model. The force of multifidus muscle was statistically different in the four loading conditions(P<0.05). The average joint compression force on T12-S1 in the backpack, shoulder-bag and handbag models increased by 37%, 45% and 64%, respectively. The peak stress on the lumbar vertebral bodies in the three models increased by 71.6%, 122.3% and 146.6%, respectively; the peak stress on the annulus fibrosus increased by 155.6%, 183.4% and 195.8%, respectively; the peak stress on the nucleus pulposus increased by 95.2%, 146.9% and 161.5%, respectively. Conclusion The balanced way of load-carrying can reduce the activation of muscles and the burden of lumbar spine, which has a protective effect on the body. When a shoulder-bag or handbag is carried, the trunk keeps balance due to muscle contraction, which increases the stress on intervertebral discs.

Key words: Lumbar spine, Paraspinal muscle, Musculoskeletal model, Finite element, Stress distribution

CLC Number: 

  • R681.5
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