人类活体髋关节的动态应力评估

目的评估活体人髋关节的应力水平状态,为临床应用提供理论依据。方法基于德国柏林大学生物力学实验室所采集的活体人髋关节数据库,应用赫兹弹性理论,分析活体人髋关节在最经常的8种人类活动中(慢速步行、中速步行、快速步行、屈膝、上楼梯、下楼梯、起立、坐下等),髋关节的应力水平状态。结果(1)依照以上活动顺序,最大应力峰值依次为:11.25MPa,11.38MPa,11.89MPa,10.32MPa,11.66MPa,11.63MPa,10.37MPa,10.29MPa;最小应力峰值依次为:5.32MPa,5.77MPa,6.54MPa,7.40MPa,5.96MPa,6.41MPa,6.00MPa,5.56MPa;(2)依照以上活动顺序,平均应力峰值依次为:8.72MPa,8.95MPa,9.63MPa,8.70MPa,8.83MPa,9.23MPa,8.01MPa,7.77MPa。结论(1)活体人髋关节在这8种日常活动中的峰值应力介于5.32MPa与11.89MPa之间;(2)平均应力为8.72MPa;(3)人类在快速步行过程中,髋关节具有较大的峰值应力。

Human hip stress evaluations in vivo at dynamic cases

Objectives To evaluate the hip stress status in vivo in order to serve for clinic. Methods Based on gait database of the human hip in vivo collected by Biomechanics Lab of Berlin University and Hertzian elasticity contact theory, a realistic stress level analysis for dynamic cases at hip joint(including: walking slowly, walking normal, walking fast, knee bend, going up stairs, going down stairs, standing up and sitting down activities) is presented. Results The maximum peak stress for the human eight routine activities is 11.25 MPa, 11.38 MPa, 11.89 MPa, 10.32 MPa, 11.66 MPa, 11.63 MPa, 10.37 MPa, 10.29 Mpa respectively; The minimum peak stress for the human eight routine activities is 5.32 MPa, 5.77 MPa, 6.54 MPa, 7.40 MPa, 5.96 MPa, 6.41 MPa, 6.00 MPa, 5.56 MPa respectively. The average peak stress is 8.75 MPa, 8.95 MPa, 9.63 MPa, 8.70 MPa, 8.83 MPa, 9.23 MPa, 8.01 MPa, 7.77 MPa. Conclusions (1) The peak stresses in human routine activities range from 5.32 MPa to 11.89 MPa; (2) The general average peak stress in the human routine activities is 8.72 MPa; (3) The peak stress distributions have a double peak curve for walking cases, and there exist the peak stress for the walking fast case.