Faculty of Engineering, Islamic Azad University-Tehran North Branch, Tehran, Iran.
Iranian Tajhiz Sina, Co., Tehran, Iran.
Proc Inst Mech Eng H. 2021 Jun;235(6):625-635. doi: 10.1177/0954411921999482. Epub 2021 Mar 8.
Heat generation during bone cutting by sagittal saw may lead to temperature rise and possible incidence of thermal necrosis. The aim of the present research is to examine the effect of saw blade oscillation rate, blade feed rate, and irrigation by physiological saline solution on the bone temperature rise during sawing in order to determine the desired conditions for reducing the extent of thermal damage. For this purpose, empirical tests of bovine femur cutting were performed in 15 states, including five levels for the blade oscillation rate (10,000-18,000 cpm with 2000 cpm intervals) and three levels for the feed rate (10-30 mm.min with 10 mm.min intervals) for dry conditions; and five states, including five levels for the blade oscillation rate (10,000-18,000 cpm with 2000 cpm intervals) and one level in feed rate of 20 mm.min for the irrigation conditions. The results indicated that the bone temperature rise had a direct relationship with the blade oscillation rate and an inverse relationship with its feed rate. In the state of no cooling, the minimum temperature rise (Δ = 65.45°C) occurred at the blade speed of 10,000 cpm and feed rate of 30 mm.min, while in the state of sawing with irrigation, the temperature rise almost did not exceed the allowable range (Δ ≤ 10°C). The results suggested that to lower the possibility of incidence of osteonecrosis in the bone resection by sagittal saw, cooling with physiological saline solution or application of the minimum blade oscillation rate and maximum feed rate is recommended.
骨切割时的锯片发热可能导致温度升高，并可能发生热坏死。本研究旨在研究锯片摆动速度、锯片进给速度和生理盐水冲洗对锯切过程中骨温升的影响，以确定减少热损伤程度的理想条件。为此，在 15 种状态下对牛股骨进行了经验测试，包括摆动速度（10000-18000 次/分，间隔 2000 次/分）的 5 个水平和进给速度（10-30 毫米/分，间隔 10 毫米/分）的 3 个水平，干燥条件下；以及 5 种状态，包括摆动速度（10000-18000 次/分，间隔 2000 次/分）的 5 个水平和 1 个进给速度为 20 毫米/分的水平，在冲洗条件下。结果表明，骨温升与锯片摆动速度呈直接关系，与进给速度呈反比。在无冷却状态下，在锯片速度为 10000 次/分和进给速度为 30 毫米/分时，温升最低（Δ=65.45°C），而在锯切时使用生理盐水冲洗的状态下，温升几乎不超过允许范围（Δ≤10°C）。结果表明，为了降低矢状锯骨切除时发生骨坏死的可能性，建议采用生理盐水冷却或应用最小锯片摆动速度和最大进给速度。
