Department of Mechanical Engineering, University of Michigan, Ann Arbor, Michigan.
Department of Mechanical and Vehicle Engineering, Hunan University, Changsha, Hunan, China.
J Orthop Res. 2019 Nov;37(11):2297-2306. doi: 10.1002/jor.24419. Epub 2019 Aug 1.
Kirschner wire (K-wire) is a common tool in clinical orthopedic surgery for bone fracture fixation. A significant amount of heat is generated in bone drilling using K-wires, causing bone thermal necrosis and osteonecrosis. To minimize the temperature rise, a hollow notched K-wire in a modified surgical hand drill with through-tool cooling was developed to study the bone temperature, debris evacuation, and material removal rate. The hollow notched K-wire was fabricated by grinding and micro-milling on a stainless steel tube. Bone drilling tests were conducted to evaluate its performance against the solid K-wires. Results showed that compared with solid K-wires, hollow notched K-wire drilling without cooling reduced the peak bone temperature rise, thrust force, and torque by 42%, 59%, and 62% correspondingly. The through-tool compressed air reduced the peak bone temperature rise by 48% with the forced air convection and better debris evacuation. The through-tool water cooling decreased the bone temperature by only 26% due to accumulation and blockage of bone debris in the groove and channel. This study demonstrated the benefit of using the hollow notched K-wire with through-tool compressed air to prevent the bone thermal necrosis. © 2019 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res 37:2297-2306, 2019.
克氏针（K-wire）是临床骨科中用于骨折固定的常用工具。使用 K-wire 进行骨钻孔会产生大量热量，导致骨热坏死和骨坏死。为了将温度升高降到最低，开发了一种带有贯穿式工具冷却的改良手术手钻中的空心开槽 K-wire，以研究骨温度、碎片清除和材料去除率。空心开槽 K-wire 通过在不锈钢管上研磨和微铣削制成。进行了骨钻孔测试以评估其相对于实心 K-wire 的性能。结果表明，与实心 K-wire 相比，无冷却的空心开槽 K-wire 钻孔可分别降低 42%、59%和 62%的峰值骨温升、推力和扭矩。贯穿式压缩空气通过强制空气对流和更好的碎片清除，将峰值骨温升降低了 48%。贯穿式水冷仅将骨温度降低了 26%，这是由于骨碎片在凹槽和通道中的积聚和堵塞。这项研究表明，使用带有贯穿式压缩空气的空心开槽 K-wire 可防止骨热坏死。©2019 矫形研究学会。由 Wiley Periodicals, Inc. 出版。J Orthop Res 37:2297-2306, 2019.
