Design and biomechanical study of a novel double-leaf proximal humeral locking plate
10.16156/j.1004-7220.2017.05.03
- VernacularTitle:新型双叶型肱骨近端锁定钢板的研制与生物力学研究
- Author:
Lang-qing ZENG
1
;
Lu-lu ZENG
2
;
Yun-feng CHEN
3
;
Yan-jie LIU
3
;
Hui YANG
1
;
Zhi-rong LIN
1
;
Wen HANG
3
;
Hai-feng WEI
3
Author Information
1. Department of Trauma Orthopedics， Zhuhai People’s Hospital, Zhuhai Hospital Affiliated with Jinan University
2. Department of Anesthesiology, Zhuhai People’s Hospital, Zhuhai Hospital Affiliated with Jinan University
3. Department of Orthopaedics, the Sixth People’s Hospital，Shanghai Jiao Tong University
- Publication Type:Journal Article
- Keywords:
Proximal humeral fractures;
Complex fractures;
Locking plates;
Internal fixation;
Biomechanics
- From:
Journal of Medical Biomechanics
2017;32(5):E407-E414
- CountryChina
- Language:Chinese
-
Abstract:
Objective To design a novel double-leaf proximal humeral locking plate for fixing greater and lesser tuberosities in complex proximal humeral fractures, and evaluate its fixing stability by biomechanical tests. Methods Twelve fresh-frozen humerus specimens with intact rotator cuff were randomly divided into two groups (Group A and Group B) to establish the same greater and lesser tuberosities fracture models. Specimens in Group A were fixed with the double-leaf proximal humeral locking plate, while specimens in Group B were fixed with the proximal humeral internal locking system (PHILOS) and tension band suture, and a 3.5-mm cannulated screw was added to stabilize the lesser tuberosity. The tensile test on subscapularis, infraspinatus and teres, supraspinatus as well as the load-to-failure test on greater and lesser tuberosities were performed on specimens in two groups. Results For subscapularis tensile tests, displacements under 150 N tensile stretch and after fatigue test in Group A were both significantly smaller than those in Group B (P<0.05). For infraspinatus and teres tensile tests, there were no statistical differences between Group A and B in displacements under 150 N tensile stretch and after fatigue test (P>0.05). For supraspinatus tensile tests, there were no statistical differences between Group A and B in displacements under 90 N tensile stretch and after fatigue test (P>0.05). For load-to-failure tests on lesser tuberosity, the failure load in Group A was significantly greater than that in Group B (P<0.05), and the failure displacement in Group A was significantly smaller than that in Group B (P<0.05). For load-to-failure tests on greater tuberosity, there were no statistical differences between Group A and B in both the failure load and failure displacement (P>0.05). Conclusions Compared with the ordinary tension band suture plus cannulated screw for fixing lesser tuberosity, the novel double-leaf proximal humeral locking plate shows more obvious biomechanical stability, with the advantage of simultaneously fixing greater and lesser tuberosities. The research findings provide a new choice for the clinical treatment of complex proximal humeral fractures.
