Biomechanical Study on Different fixation Methods of Cannulated Screws for Posterior Malleolus Fracture
10.16156/j.1004-7220.2023.01.16
- VernacularTitle:空心螺钉不同固定方式治疗后踝骨折的生物力学研究
- Author:
Dandan SUN
1
;
Gengqiang SHI
1
;
Kewei DU
1
,
2
Author Information
1. School of Health Science and Engineering, University of Shanghai for Science and Technology
2. Department of Orthopaedics, Shidong Hospital Affiliated to University of Shanghai for Science and Technology
- Publication Type:Journal Article
- Keywords:
posterior malleolus fracture;
cannulated screw;
fixation angle;
biomechanics
- From:
Journal of Medical Biomechanics
2023;38(1):E110-E115
- CountryChina
- Language:Chinese
-
Abstract:
Objective To study biomechanical effects of cannulated screws at different fixation angles on posterior malleolus fracture based on finite element method, so as to determine the best fixation method of cannulatedscrew. Methods The finite element model of ankle joint, including tibia, fibula, astragalus, corresponding cartilage and ligaments was reconstructed using CT images, and 1 / 2 posterior malleolus fracture model was established on the basis of verifying its validity. The biomechanical effects of cannulated screw fixation on posterior malleolus fracture fixation model were analyzed. Results Compared with 0°,5°,10°,20° fixation model, the 15° fixation model had the smallest displacement. The screw stress of 15° fixation model was lower than that of 5°, 10°, 20° fixation model, and higher than that of 0° fixation model. But when the screw fixation angle was 0°, the peak contact pressure of ankle joint was much larger than that of normal ankle joint, which was easy to cause traumatic osteoarthritis. Conclusions Cannulated screw is safe and effective for treating posterior malleolus fracture which is less than 1 / 2 fragment size. The displacement and stress of the model are different at different fixation angles of screws. When the fixation angle of screw is 15°, the biomechanical stability is the best, which can be used to guide clinical operation.
