Bailey R W, Dubow H I
Clin Orthop Relat Res. 1981 Sep(159):157-70.
Based on animal experiments, we observe that the central portion of an epiphysis can be subjected to acute trauma in a low order of its cross-sectional area without interfering with growth. Moreover, the presence of a metallic device of small diameter placed across the center of the distal femoral epiphysis of a growing dog does not interfere with growth. A metal pin with a T-shaped end can be placed across the distal femoral epiphysis of a growing dog with the T-shaped end fixed in the epiphysis without interfering with growth. As growth occurs, migration of the spin or elongation of the femur beyong the pin does not occur. On the contrary, the T-shaped device, because of fixation of the end of the T, is passively carried along with the epiphysis as the femur elongates with growth. Based on the above experiments, an extensible fixative device was developed which would elongate with the distracting force of growth. The nail responded to these forces, elongating with femoral growth and did not retard growth. Microscopic analysis of the nail tracts across the epiphyseal plates showed no tendency to premature closure of the epiphyseal line. The tracts formed by the nails were lined with fibrous tissue; the remainder of the epiphysis showed a normal histologic structue.
基于动物实验，我们观察到骨骺的中央部分在其横截面积较小的情况下可承受急性创伤而不影响生长。此外，在一只正在生长的狗的股骨远端骨骺中心放置一个小直径的金属装置，并不会干扰生长。一个带有T形末端的金属针可以穿过正在生长的狗的股骨远端骨骺，T形末端固定在骨骺中而不影响生长。随着生长的发生，股骨的旋转或在针之外的伸长并不会出现。相反，由于T形末端的固定，随着股骨随着生长而伸长，T形装置会随着骨骺被动移动。基于上述实验，开发了一种可伸展的固定装置，它会随着生长的牵拉力而伸长。该钉对这些力有反应，随着股骨生长而伸长，并且不会阻碍生长。对穿过骨骺板的钉道进行显微镜分析表明，骨骺线没有过早闭合的趋势。钉形成的通道内衬有纤维组织；骨骺的其余部分显示出正常的组织结构。
