3 Biomed Eng Appl Basis Commun 200416233 237 Downloaded from

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-3- Biomed. Eng. Appl. Basis Commun. 2004.16:233-237. Downloaded from by 14.139.37.108 on 11/11/19. Re-use and distribution is strictly not permitted, except for Open Access articles.
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236 3. RESULTS In the previous section , a ball-socket contact elastic modelling of the human hip joint was successfully established. On other words, if the radius and the material constants of the human femoral head and acetabulum and the resultant force acting on the hip are known , the peak stress and stress distributions and the articular contact area can be directly determined from Eq. (13). At the following, as an example, the formulae are examined. The parameter values are taken as following[32]: Rj=25mm, R2=24mm, E1=E2=2. 989GPa, ,u i_ p 2=0.29 P=70Kg Then from Eq ( 13), we have, rc 5.74mm q0 9.74MPa Vol. 16 No. 5 October 2004 of bone are different due to the age, race, sex, dry bone and fresh bone etc. Therefore, it is necessary to develop a predictive modelling for clinical practice. In this paper, a ball-socket articular contact elastic modelling of the human hip joint was successfully established. This modelling can be used to predict the peak stress, the weight bearing area and the stress distributions of the articular contact at the human hip joint. As a test for the validation of modelling, an example is examined . The results show that the predictions from the current modelling are basically agreement with those reported in literatures. This shows the validity of the current modelling. ACKNOWLEDGEMENT (14) It is , in the case , that the peak stress and the radii of the articular elastic contact at the human hip joint are, respectively, 9.74MPa and 5.74mm. While, the stress distributions of the articular contact area at the hip joint is determined by the Eq (14). Basically, these results are basically agreement with those reported in the literatures for peak contact stress , such as [33]: IOMPa; [34]: 4.9-9.6; [35]: 6-1OMPa; [36]: 7.5- 9.OMPa; etc. This shows the validity of the current modelling. 4. DISCUSSIONS The peak stress, the weight bearing area and the stress distributions of the articular contact at the human hip joint are thought to be most important factors, which determine the location of the degenerative foci that later result in degenerative damage and in the development of osteoarthritis. However, so far these key factors are, mainly, determined by measured in vitro or vivo . It is noticeable that the human bone is inhomogeneous . And also , the mechanical properties -4- This work is supported by Natural Science Foundation of ShanDong Province in China (Grand No. Y2003C01). REFERENCES 1. Mao BinRao: The Surgery of Hip Joint. The People's Health Press , Beijing : 1998, p5-56. 2. Brinckmann P, Frobin W, Hierholzer E. Stress on the articular surface of the hip joint in healthy adults and persons with idiopathic osteoarthrosis of the hip joint. J Biomech 1981; 14 (3): 149-56. 3. Hadley NA, Brown TD, Weinstein SL. The effects of contact pressure elevations and aseptic necrosis on the long - term outcome of congenital hip dislocation. J Orthop Res 1990; 8 (4): 504-13.
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  • Summer '20
  • Rajendra Paramanik
  • joints, Synovial joint, Hertzian contact stress

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