Chinese Journal of Tissue Engineering Research ›› 2011, Vol. 15 ›› Issue (22): 3991-3994.doi: 10.3969/j.issn.1673-8225.2011.22.001

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Three-dimensional finite analysis of hip contact area and contact pressure during normal walking

Wang Guang-Ye1, Zhang Chun-Cai2, Xu Shuo-gui2   

  1. 1Department of Orthopaedics, Wuhu No.2 People’s Hospital, Wuhu  241000, Anhui Province, China
    2Department of Orthopedics, Changhai Hospital, Second Military Medical University of Chinese PLA, Shanghai  200433, China
  • Received:2011-01-19 Revised:2011-03-26 Online:2011-05-28 Published:2011-05-28
  • About author:Wang Guang-ye☆, Doctor, Associate chief physician, Department of Orthopaedics, Wuhu No.2 People’s Hospital, Wuhu 241000, Anhui Province, China wangguangye@126.com
  • Supported by:

    Science and Technology Research Project of Shanghai Science and Technology Committee, No. 03JC140087*

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Abstract:

BACKGROUND: Estimation of the hip joint contact area and pressure distribution during activities of daily living is important in predicting joint degeneration mechanism, prosthetic implant wear, providing biomechanical rationales for preoperative planning and postoperative rehabilitation.
OBJECTIVE: To explore the hip joint contact area and pressure distribution during different trait phases, which is important in predicting joint degeneration mechanism. 
METHODS: CT scanning and computer image processing system were used to establish the model to simulate the situation of acetabulum for 32 phases during the trait. A finite element solves was used to calculate stress and contact area. 
RESULTS AND CONCLUSION: Stress distribution within the acetabular cartilage was obtained and regions with elevated stress at 32 phases were located. The stress distributions of 32 phases were significantly different. The stress demonstrated the bimodal shape of a pronounced phush-off often seen in trial gait cycle (4.2 MPa). The regions of elevated stress and contact area of acetabulum both occurred during stance phases of a gait cycle. Persistent stress-transfer located on medial roof, while on anterior and posterior horn there is always no stress-transfer. The elevated stress located roof during stance phases and medial acetabular cartilage during swing-phases respectively. These results can be used to rationalize rehabilitation protocols, functional restrictions after complex acetabular reconstructions, the renions of elevated stress and contact area of acetabulum are important, which provide an insight into the factors contribution to the arthritis.

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