Lin Cheng-Li, Su Fong-Chin, Chang Chih-Hsun, Hong Chih-Kai, Jou I-Ming, Lin Chii-Jeng, Su Wei-Ren
Institute of Biomedical Engineering, National Cheng Kung University, Tainan, Taiwan; Department of Orthopaedics, National Cheng Kung University Hospital, College of Medicine, National Cheng Kung University, Tainan, Taiwan; Medical Device Innovation Center, National Cheng Kung University, Tainan, Taiwan.
Institute of Biomedical Engineering, National Cheng Kung University, Tainan, Taiwan; Medical Device Innovation Center, National Cheng Kung University, Tainan, Taiwan.
J Shoulder Elbow Surg. 2015 Apr;24(4):547-54. doi: 10.1016/j.jse.2014.09.032. Epub 2014 Nov 7.
An abduction brace and abduction exercises are commonly employed after humeral greater tuberosity fracture repair. However, the effects of glenohumeral abduction on the biomechanical strength have seldom been elucidated.
We studied 24 pairs of female fresh frozen porcine shoulders randomly divided into 3 groups. After creation of a greater tuberosity fracture on each shoulder, 3 fixation techniques were used for the 3 groups: double-row suture anchor fixation (DR), suture bridge technique (SB), and 2-screw fixation (TS). This biomechanical study was conducted to compare the forces that create 3- and 5-mm displacements and the ultimate failure load at the simulated shoulder abduction angles of 0° and 45° among the 3 groups.
In the DR group, the mean forces to create 3- and 5-mm displacements and the failure load at 0° were higher than those at 45° (P = .036, P = .012, P = .027). By contrast, in the SB group, the mean forces to create 3- and 5-mm displacements at 45° were greater than those at 0° (P = .012, P = .012). There were no significant differences in the forces to create 3- and 5-mm displacements and construct failure between 0° and 45° in the TS group (P = .575, .327, .478).
The DR group had greatest initial fixation strength at a low abduction angle, whereas the SB group had the highest initial fixation strength at a high abduction angle. The TS group appeared unaffected by the abduction angle.
肱骨大结节骨折修复术后通常使用外展支具和外展练习。然而，很少有研究阐明盂肱关节外展对生物力学强度的影响。
我们研究了24对雌性新鲜冷冻猪肩，随机分为3组。在每个肩部制造大结节骨折后，3组分别采用3种固定技术：双排缝合锚钉固定（DR）、缝合桥技术（SB）和双螺钉固定（TS）。本生物力学研究旨在比较3组在模拟肩部外展角度为0°和45°时产生3毫米和5毫米位移的力以及最终破坏载荷。
在DR组中，产生3毫米和5毫米位移的平均力以及0°时的破坏载荷高于45°时（P = .036，P = .012，P = .027）。相比之下，在SB组中，45°时产生3毫米和5毫米位移的平均力大于0°时（P = .012，P = .012）。TS组在0°和45°时产生3毫米和5毫米位移的力以及结构破坏方面无显著差异（P = .575，.327，.478）。
DR组在低外展角度时初始固定强度最大，而SB组在高外展角度时初始固定强度最高。TS组似乎不受外展角度的影响。
