Li-Kun Hung1,2, Kuo-Chih Su3,4, Wen-Hsien Lu1,5,6, Cheng-Hung Lee7,8. 1. Department of Orthopedics, Taichung Veterans General Hospital, 1650 Taiwan Boulevard Sect. 4, Taichung, Taiwan, 40705, Taiwan. 2. Department of Orthopedics, Chiayi Branch, Taichung Veterans General Hospital, Chiayi, Taiwan. 3. Department of Medical Research, Taichung Veterans General Hospital, Taichung, Taiwan. 4. Department of Biomedical Engineering, Hung Kuang University, Taichung, Taiwan. 5. Department of Orthopedics, Feng-Yuan Hospital, Taichung, Taiwan. 6. Department of Marine Biotechnology and Resources, National Sun Yat-sen University, Kaohsiung, Taiwan. 7. Department of Orthopedics, Taichung Veterans General Hospital, 1650 Taiwan Boulevard Sect. 4, Taichung, Taiwan, 40705, Taiwan. 298f@vghtc.gov.tw. 8. Department of Biotechnology, Hung Kuang University, Taichung, Taiwan. 298f@vghtc.gov.tw.
Abstract
PURPOSE: A clavicle hook plate is a simple and effective method for treating acromioclavicular dislocation and distal clavicle fractures. However, subacromial osteolysis and peri-implant fractures are complicated for surgeons to manage. This study uses finite element analysis (FEA) to investigate the post-implantation biomechanics of clavicle hook plates with different hook angles. METHODS: This FEA study constructed a model with a clavicle, acromion, clavicle hook plate, and screws to simulate the implantation of clavicle hook plates at different hook angles (90°, 95°, 100°, 105°, and 110°) for treating acromioclavicular joint dislocations. This study investigated the biomechanics of the acromion, clavicle, hook plate, and screws. RESULTS: A smaller hook angle increases the stress on the middle third of the clavicle. A larger hook angle increases the force exerted by the clavicle hook plate on the acromion. The screw at the most medial position on the plate generated the highest stress. The highest stress on the implanted clavicle hook plate was on the turning corner of the hook. CONCLUSIONS: A clavicle hook plate with different hook angles may induce different biomechanical behaviors in the clavicle and acromion. Orthopedic surgeons must select a suitable clavicle hook plate based on the anatomical structure of each patient.
PURPOSE: A clavicle hook plate is a simple and effective method for treating acromioclavicular dislocation and distal clavicle fractures. However, subacromial osteolysis and peri-implant fractures are complicated for surgeons to manage. This study uses finite element analysis (FEA) to investigate the post-implantation biomechanics of clavicle hook plates with different hook angles. METHODS: This FEA study constructed a model with a clavicle, acromion, clavicle hook plate, and screws to simulate the implantation of clavicle hook plates at different hook angles (90°, 95°, 100°, 105°, and 110°) for treating acromioclavicular joint dislocations. This study investigated the biomechanics of the acromion, clavicle, hook plate, and screws. RESULTS: A smaller hook angle increases the stress on the middle third of the clavicle. A larger hook angle increases the force exerted by the clavicle hook plate on the acromion. The screw at the most medial position on the plate generated the highest stress. The highest stress on the implanted clavicle hook plate was on the turning corner of the hook. CONCLUSIONS: A clavicle hook plate with different hook angles may induce different biomechanical behaviors in the clavicle and acromion. Orthopedic surgeons must select a suitable clavicle hook plate based on the anatomical structure of each patient.
Authors: Davut Tiren; Alexander J M van Bemmel; Dingeman J Swank; Frits M van der Linden Journal: J Orthop Surg Res Date: 2012-01-11 Impact factor: 2.359
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