Biomechanical Study on the Cyclic Stability of Distal Radius C2 Type Osteoporotic Fractures Using Locking Plates in a Cadaver Model

被引:2
作者
Hsiao, Chih-Kun [1 ]
Tu, Yuan-Kun [2 ]
Lee, Cheng-Hung [3 ]
Yen, Cheng-Yo [2 ]
Kao, Feng-Chen [2 ]
Tsai, Yi-Jung [1 ]
机构
[1] E Da Hosp, Dept Med Res, Kaohsiung 82445, Taiwan
[2] E Da Hosp, Dept Orthoped, Kaohsiung 82445, Taiwan
[3] Taichung Vet Gen Hosp, Dept Orthoped, Taichung 40705, Taiwan
关键词
Biomechanics; Cyclic loading; Osteoporotic fracture; Distal radius; INTERNAL-FIXATION; OPEN REDUCTION; VOLAR; DORSAL; BONE; FORCES; END;
D O I
10.1007/s40846-017-0346-x
中图分类号
R318 [生物医学工程];
学科分类号
0831 ;
摘要
The primary purpose of this study was to investigate the dynamic stability and failure strengths of distal radius C2 type fractures fixed with three new-designed locking plate fixations, including dorsal dual plates, volar T-plate and volar V-plate in a cadaveric model. The second purpose was examined the hysteresis behavior of locking screws in the osteoporotic bone. Eighteen human radii were arranged in three groups and stabilized with one of the three types of locking systems. Stiffness under the loading phases of 100, 200 and 300 N, with 2000 cycles for each, was evaluated to assess the stability during cyclic loading. After cycling, each construct was loaded to failure to obtain the ultimate strength and failure mode. Under loading level of 300 N, the stiffness degradation for dorsal dual plates, volar T-plate and volar V-plate at 6000th cycle are 50, 41, and 29%, respectively. The V-plate had a high failure strength at 1108 N, compared to 740 N in T-plate and 727 N in dorsal dual plates. The osteoporotic specimens showed a typical non-linear load-unload-deformation hysteretic characteristic and cumulate deformations, decreasing the stiffness of the constructs. The stability of the constructs degraded as the cycling and loading level, however, the load level had a greater effect on the degradation of stiffness than the number of cycles in osteoporotic bones. Therefore, the implants should be designed with sufficient stiffness to prevent the loss of reduction due to stiffness attenuation for osteoporotic bones under cyclic loading.
引用
收藏
页码:707 / 714
页数:8
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