Wang F.,Shanghai JiaoTong University |
Liu R.,Shanghai JiaoTong University |
Wang Q.-G.,Shanghai JiaoTong University |
Shi D.-F.,Shanghai JiaoTong University |
And 3 more authors.
Yiyong Shengwu Lixue/Journal of Medical Biomechanics | Year: 2011
Objective: To analyze the axial stiffness of human pelvis that were set with the double support standing posture and subjected to gradient vertical loads. Method: Nine intact embalmed cadaver specimens were marked from 1# to 9# according to the test sequence, and then subjected to vertical static loads in the gradient of 100 N from 0 N to 500 N. The load-displacement data were collected by using the beam sensor of electronic universal testing machine to calculate the axial stiffness of human pelvis. Results: The differences of axial stiffness among individual pelvis were large (P=0.815), ranging from 240 N/mm to 776 N/mm. All the pelvic specimens were divided into three groups by cluster analysis (the first group: 1#, 2#, 3#, 5#, 9#, the second group: 4#, 6#, 8#, the third group: 7#). According to the processed results, there were statistical differences among the groups (P<0.05). The trends of pelvic axial stiffness were different under gradient loads. The axial stiffness of the first and third group, totally six specimens, increased with loads increasing; while the axial stiffness of the second group including three specimens increased first, but then decreased with the loads increasing. Conclusions: There are significant individual differences in pelvic axial stiffness and its changing discipline within the physiological range; the cluster analysis can be used to analyze the changing discipline between the load and stiffness of human pelvis; as a whole, the pelvic axial stiffness increased with the loads increasing.