Draper E R, Strachan R K, Hughes S P, Nicol A C, Paul J P
Orthopaedic Surgery Unit, Royal Postgraduate Medical School, Hammersmith Hospital, London, UK.
Med Eng Phys. 1997 Dec;19(8):690-5. doi: 10.1016/s1350-4533(97)00037-4.
A unilateral external fixator has been designed for controlled experiments into the effects of micromovement on fracture healing. The experimental model used is based on a diaphyseal osteotomy of the right tibia of the sheep. The main bar has linear bearings, which allows free axial movement. This is then controlled by a spring whose stiffness can be varied. The resulting axial micromovement can be calculated from the measured compressive force and the known axial stiffness of the fixator. The transducer has limits of error of +13.3 N and -44.5 N. Preliminary measurements showed maximum micromovement at the fracture site of 0.48 mm during slow walking.
一种单侧外固定器已被设计用于关于微动对骨折愈合影响的对照实验。所使用的实验模型基于绵羊右胫骨骨干截骨术。主杆带有线性轴承，可实现自由轴向移动。然后由一个刚度可变的弹簧进行控制。由此产生的轴向微动可根据测得的压缩力和固定器已知的轴向刚度来计算。该传感器的误差极限为 +13.3 N 和 -44.5 N。初步测量显示，在慢走过程中骨折部位的最大微动为 0.48 毫米。
