The Effect Of Temperature On The Cement Perfusion Force During Kyphoplasty

PartⅠ The development of the perfusion force measuring device during vertebral cement augmentationObjective: To develop a device for measuring the cement perfusion force directly during vertebral cement augmentation and to reduce the leakage of bone cement and risk of surgery.Methods: On the basis of physics and the existing surgical instruments, the cement perfusion force measuring device was designed according to the features of cement augmentation and vertebral structure.Results: We successfully developed cement perfusion force measuring device for augmentation of vertebrae. The device includes gauge transducer, cement putter, signal amplification and modulation device, and the data acquisition system.Conclusion: The device can directly monitor and measure the perfusion force during cement augmentation, and it can be used to reduce leakage of cement, risk and complications of surgery.Part Ⅱ The measurement of the cement perfusion force duringkyphoplastyObjective: To observe the changes of cement perfusion force during Kyphoplasty by using the self-development perfusion force measuring device in the ambient temperature of20℃ and 37℃ respectively.Methods: 10 thoracolumbar cadaveric vertebral bodies(T10-L4) was were randomlydivided into two groups: Group 1(room temperature 20℃)、Group 2(simulating human body temperature 37℃). Then the changes of cement perfusion force were recorded by self-development measuring device during unilateral kyphoplasty in two groups respectively.Results: The cement perfusion force increased with the volume of bone cement increasing in kyphoplasty. The average, maximum force of the first and second canula perfusion were 6.34±2.05 N, 10.74±3.32 N and 9.42±1.69 N, 18.18±1.77 N respectively in the ambient temperature of 20℃. In the simulating human body temperature of 37℃, the average, maximum force of the first and second canula perfusion were 9.68±1.36 N,17.95±1.72 N and 15.66±2.10 N, 23.06±2.10 N.Conclusion: 1. The temperature and the volume of bone cement vertebral affected the perfusion force of bone cement during kyphoplasty. 2. We should consider temperature effect on the the perfusion force,and shorten the perfusion time. 3. Realtime monitoring the cement perfusion force during kyphoplasty can be used as an effective method for preventing cement leakage and raising the operation safety.