Biomechanical Effects of Bone Quality Differences on Stability of Unicondylar Knee Replacement Prostheses
10.16156/j.1004-7220.2025.05.005
- VernacularTitle:骨质量差异对单髁膝关节置换假体稳定性的生物力学影响
- Author:
Zhangwen MA
1
;
Jingting XU
;
Yiming FAN
;
Jing ZHANG
;
Zhenxian CHEN
Author Information
1. 延安大学附属医院骨外科,陕西延安 716000
- Publication Type:Journal Article
- Keywords:
unicondylar knee arthroplasty;
bony quality;
prosthesis loosening;
micromotion;
contact stress
- From:
Journal of Medical Biomechanics
2025;40(5):1122-1128,1143
- CountryChina
- Language:Chinese
-
Abstract:
Objective To investigate the effects of patient bone mass differences on the stability of unicondylar knee arthroplasty(UKA)prostheses.Methods A UKA finite element model was established to quantify the effects of five different bone quality conditions on the proximal tibial von Mises stress,bone-prosthesis fixation interface contact stress,and bone-prosthesis fixation interface micromotion,using the medial knee force and joint motion predicted by the individualized UKA musculoskeletal multibody dynamics model as boundary conditions.Results The influences of bone strength on the proximal tibia von Mises stress and bone-prosthesis fixation interface contact stress were not obvious,and the difference in peak values of the proximal tibia von Mises stress between two groups of models with the largest difference in bone strength was not more than 5％,and the difference in peak values of the bone-prosthesis fixation interface contact stress was only 2.37 MPa.However,the influence of bone strength on the bone-prosthesis fixation interface micromotion was significant,and the weaker bones were more prone to cause the bone-prosthesis fixation interface micromotion.However,bone strength had a significant effect on the bone-prosthesis fixation interface micromotion,and weak bone was more likely to cause changes in the bone-prosthesis fixation interface micromotion.Compared to patients with the neutral bone quality,the prosthesis fixation interface micromotion increased by 84.67％at 20％gait cycles for patients with the weakest bone quality.Conclusions UKA patients with a weaker bone quality have a higher risk of prosthesis loosening.It is recommended that surgeons should carefully choose their surgical strategy in order to reduce the rate of postoperative revision in UKA.
