Chinese Journal of Tissue Engineering Research ›› 2019, Vol. 23 ›› Issue (32): 5170-5174.doi: 10.3969/j.issn.2095-4344.1466

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Finite element fracture mechanics analysis of gluteus medius muscle active response to osteoporotic femoral neck fracture

Sun Wentao1, Lin Ziling2, Li Fan3, Hong Dinggang1, Zhou Jianfei1, Pang Xianghua1, Wei Huaiji1, Xu Panfeng1, Wang Xiaopeng1
  

  1. 1Liuzhou Chinese Medicine Hospital, Liuzhou 545000, Guangxi Zhuang Autonomous Region, China; 2First Affiliated Hospital of Guangzhou University of Chinese Medicine, Guangzhou 510405, Guangdong Province, China; 3State Key Laboratory of Advanced Design Manufacture for Vehicle Body, Hunan University, Changsha 410082, Hunan Province, China
  • Online:2019-11-18 Published:2019-11-18
  • Contact: Lin Ziling, MD, Chief physician, Master’s supervisor, First Affiliated Hospital of Guangzhou University of Chinese Medicine, Guangzhou 510405, Guangdong Province, China
  • About author:Sun Wentao, Physician, Liuzhou Chinese Medicine Hospital, Liuzhou 545000, Guangxi Zhuang Autonomous Region, China
  • Supported by:

    the National Natural Science Foundation of China, No. 81673996 (to LZL)

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Abstract:

BACKGROUND: There are no relevant reports in the world, which protective action response of muscle stress in elderly patients is also an important factor affecting hip fracture.
OBJECTIVE: To investigate the mechanism of gluteus medius muscle on osteoporotic femoral neck fracture by finite element fracture mechanics.
METHODS: A 87-year-old woman was diagnosed as a femoral neck fracture at the First Affiliated Hospital of Guangzhou University of Traditional Chinese Medicine. The three-dimensional finite element model of hip and gluteus medius was reconstructed, and the material assignment was simulated to simulate the following three different states: before muscle activation; M1 model is defined as the femoral head and sagittal position were at an angle of 20 degrees and 500 N load was applied from the top down; after muscle activation, M2 model is external rotation of the hip joint by 5 degrees on the basis of the M1 model; in contrast to M2, the last M3 model was hip extension by internal rotation by 5 degrees. The three models were introduced into the finite element post-processing software LS-DYNA to calculate the fracture model of the femoral neck fracture based on the stress-strain curve before and after the active response of the gluteus medius muscle. The fractures before and after the three finite element fracture models were compared and analyzed.
RESULTS AND CONCLUSION: (1) M2, M3 model comparison of gluteal muscle active response: M3 model did not present femoral neck fracture after 5 degrees internal abduction, but fractured in the femoral constrained area. In the M2 model, femoral neck fractures still occurred after the external abduction of the hip was rotated 5 degrees. (2) Compared with the M1 and M2 models, the femoral neck fractures occurred in both cases, and the time of femoral neck fractures was T=22.5 ms. According to the degree of fracture displacement M1 model fracture crack GardenⅡ type, but M2 model fracture crack Garden Ⅲ type, more serious than the M1 model shift. (3) To conclude, after the initiative response of gluteus medius muscle, muscle contraction caused by changes in hip posture may be the impact of fracture of the elderly femoral neck fracture factors.

Key words: gluteus medius muscle, active response, femoral neck fracture osteoporosis, fracture mechanics, finite element analysis

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