Effects of Prosthetic Alignment on Internal Contact Mechanical Characteristics of Intact Knee Joints for Transfemoral Amputees
10.16156/j.1004-7220.2020.04.06
- VernacularTitle:假肢对线对大腿截肢者健侧膝关节内部接触力学特性的影响
- Author:
Tengyu ZHANG
1
,
2
,
3
;
Jie YAO
4
;
Zhongjun MO
5
;
Junchao GUO
5
;
Zizhan LIAN
2
;
Yubo FAN
6
,
7
Author Information
1. National Research Center for Rehabilitation Technical Aids
2. School of Biological Science and Medical Engineering, Beihang University
3. Beijing Key Laboratory of Rehabilitation Technical Aids for Old-Age Disability
4. National Research Center for Rehabilitation Technical Aids；Beijing Advanced Innovation Centre for Biomedical Engineering
5. National Research Center for Rehabilitation Technical Aids；Key Laboratory of Human Motion Analysis and Rehabilitation Technology, Ministry of Civil Affairs
6. National Research Center for Rehabilitation Technical Aids；School of Biological Science and Medical Engineering, Beihang University
7. Beijing Key Laboratory of Rehabilitation Technical Aids for Old-Age Disability；Key Laboratory of Human Motion Analysis and Rehabilitation Technology, Ministry of Civil Affairs
- Publication Type:Journal Article
- Keywords:
prosthetic alignment;
transfemoral amputee;
knee joint;
finite element analysis
- From:
Journal of Medical Biomechanics
2020;35(4):E428-E435
- CountryChina
- Language:Chinese
-
Abstract:
Objective To study the effects of prosthetic alignment on internal contact mechanical characteristics of intact knee joint for transfemoral amputees. Methods The gait experiment of transfemoral amputees was performed under different alignment conditions, and the differences of lower limb motion and ground reaction force (GRF) were analyzed and compared with those of the non-amputees. The three-dimensional （30） finite element model of knee joint was build and used to analyze the effect of alignments of socket adduction and abduction on internal contact mechanical characteristics between femur cartilage, tibia cartilage and meniscus. Results For knee joint of the non-amputees, contact force was mainly concentrated on the medial sides at the moment of the first GRF peak, while contact force was mainly concentrated on the lateral sides at the moment of the second GRF peak. However, for intact knee joint of the transfemoral amputees, contact force was mainly concentrated on the medial side at the moment of two GRF peaks. The stress of the medial meniscus, contact force and contact area between the medial meniscus and cartilage all obviously increased under the alignment of 6° socket adduction. Conclusions Compared with non-amputees, the incidence of knee osteoarthritis (OA) in amputees was higher, which was related to the long-term overload of the medial knee joint. The alignment of socket adduction may increase the risk of knee OA in the intact side of transfemoral amputees. In clinic, excessive adduction of the socket should be avoided during prosthetic alignment.
