Effects of Femoral Offset on Musculoskeletal Multi-Body Dynamics and Contact Mechanics of Artificial Hip Joint for DDH Patients
10.16156/j.1004-7220.2019.03.01
- VernacularTitle:DDH患者全髋关节置换中股骨偏心距对骨肌多体动力学和接触力学的影响
- Author:
Xihui CHEN
1
;
Wei CHAI
2
;
Yongchang GAO
3
;
Zhifeng ZHANG
1
;
Zhongmin JIN
1
Author Information
1. State Key Laboratory for Manufacturing System Engineering, School of Mechanical Engineering, Xi’an Jiaotong University
2. Department of Orthopaedics, General Hospital of PLA
3. School of Construction Machinery, Chang’an Universit
- Publication Type:Journal Article
- Keywords:
developmental dysplasia of the hip (DDH);
total hip arthroplasty (THA);
muscluloskeletal multibody dynamics;
finite element analysis;
biomechanics
- From:
Journal of Medical Biomechanics
2019;34(3):E225-E231
- CountryChina
- Language:Chinese
-
Abstract:
Objective To investigate the biomechanical effects of femoral offset (FO) on total hip arthroplasty (THA) patients with developmental dysplasia of the hip (DDH). Methods Based on the musculoskeletal dynamic software AnyBody and the related data from a female patient with Crowe Ⅳ DDH, the corresponding patient-specific lower extremity musculoskeletal multi-body dynamic model was constructed to analyze both hip joint forces and abductor forces within ±20 mm variation of FOs. The dynamic finite element (FE) model of S-ROM stem with varying offsets was also established. The dynamic load during a whole walking gait cycle calculated by the multi-body musculoskeletal model was applied to this FE models, and the Von Mises stress, contact stress, and stem-sleeve micromotion were then analyzed. Results A variation of ±20 mm offset had small influences on peak forces of hip joints. However, the decrease in FO could lead to an obvious increase in peak abductor force, while the increase in FO could lead to an obvious increase in the maximum Von Mises stress, contact stress, and micromotion of S-ROM prosthesis stem. Conclusions The change in FO had an obvious influence on the abductor forces, the maximum Von Mises stress, the contact pressure and the consequent fretting wear of THA patients with DDH, which should be carefully considered by surgeons.
