McDonald D E, Palmer R H, Hulse D A, Neigut J S, Hyman W A, Slater M R
Department of Small Animal Medicine and Surgery, College of Veterinary Medicine, Texas A&M University, College Station.
Vet Surg. 1994 Nov-Dec;23(6):488-93. doi: 10.1111/j.1532-950x.1994.tb00510.x.
We compared the pin-bone interfaces at the near and far cortical penetration sites of positive-profile end-threaded external fixation pins in cadaveric canine tibiae. The holding power of the pins in each cortical surface was independently measured in 21 pin-bone sections. Scanning electron microscopy (SEM) was used to compare subjectively the microstructural appearance of the pin-bone interfaces at the near and far cortical penetration sites in eight pin-bone sections. The far cortical penetration site provided greater holding power than did the near cortical site. SEM evaluation suggested more bony microfractures and debris with less pin-bone SEM evaluation suggested more bony microfractures and debris with less pin-bone interlock in the near cortical penetration sites than in the corresponding far cortical penetration sites. This study showed that after low-speed power insertion of positive-profile end-threaded pins in canine cadaveric tibiae, the near cortical penetration site contributes approximately 25% less to the overall holding power of the pin than does the far cortical penetration site.
我们比较了正型螺纹外固定针在犬类尸体胫骨近端和远端皮质穿透部位的针-骨界面。在21个针-骨切片中分别测量了每根针在每个皮质表面的把持力。使用扫描电子显微镜（SEM）主观比较了8个针-骨切片中近端和远端皮质穿透部位针-骨界面的微观结构外观。远端皮质穿透部位的把持力比近端皮质部位更大。SEM评估表明，近端皮质穿透部位比相应的远端皮质穿透部位有更多的骨微骨折和碎片，针-骨互锁更少。本研究表明，在犬类尸体胫骨中低速动力插入正型螺纹针后，近端皮质穿透部位对针的整体把持力的贡献比远端皮质穿透部位少约25%。
