Finite element analysis of interface pressure over the above knee residual limb at mid stance with pre-stress
- VernacularTitle:预应力下大腿残肢站立中期时相的有限元分析
- Author:
Chen MU
1
;
Xiu qing QIAN
1
;
Song hua YAN
1
;
Zhi cheng LIU
1
Author Information
1. School of Biomedical Engineering, Capital Medical University
- Publication Type:Journal Article
- Keywords:
Residual limb;
Joint change;
Pre-stress;
CT scans;
Finite element analysis;
Gait
- From:
Journal of Medical Biomechanics
2011;26(4):E321-E324
- CountryChina
- Language:Chinese
-
Abstract:
Objective To investigate the interface pressure on above knee residual limb at mid stance during walking，so as to provide basis for the establishment of measurement and evaluation system for the above-knee socket. Methods Based on CT images of the femur, soft tissue and above knee socket of the patient with residual limb, the three-dimensional model was first built, and then to assemble them according to changes of the hip joint in a gait cycle. The finite element model was then established to simulate the loading conditions at mid stance during a gait cycle, and the effect of pre-stress was investigated by nonlinear large deformation analysis. Results If considering the effects such as joint changes and pre-stress, the maximum value by calculation for normal interface pressure distributed on the terminal of stump was 257.66 kPa, which could better match the maximum stress actually measured by the Mflex Sensor Distributing System as 258.9 kPa. Conclusions The three-dimensional finite element model with considering the factors such as hip joint change, pre-stress and friction could effectively simulate the stress condition of patient with residual limb during walking.
