Aldinger Peter R, Schneider Michael, Pritsch Maria, Kreutzer Jürgen, Becker Christian R, Breusch Steffen J
Department of Orthopedics I, University of Heidelberg, Germany.
Acta Orthop Scand. 2003 Jun;74(3):270-6. doi: 10.1080/00016470310014181.
In a cadaver study, we prepared 20 matched pairs of human femora using chipped-tooth broaches and robotic milling with the same geometry. For robotic bone preparation the CASPAR robotic system with a rotating milling head was used. Cancellous bone was irrigated with 1 liter of pulsed lavage and the specimens were embedded in specially-designed pots. After vacuum mixing, bone cement was introduced in a retrograde manner and subjected to a standard pressure protocol with a constant force of 3,000 N. Radiographs were taken and horizontal sections were obtained at predefined levels, using a diamond saw. Microradiographs of the bone slices were taken, digitized and analyzed to assess cement penetration into cancellous bone. No femoral fractures or fissures occurred with either preparation technique. The microradiographic evaluation showed no morphometric differences between chipped-tooth broaches and robotic milling as regards cement penetration into cancellous bone. Therefore, in the presence of pulsed lavage, we conclude that robotic bone preparation does not increase cement penetration into cancellous bone of the proximal end of the femur.
在一项尸体研究中，我们使用具有相同几何形状的碎齿拉刀和机器人铣削技术制备了20对匹配的人类股骨。对于机器人骨制备，使用了带有旋转铣削头的CASPAR机器人系统。用1升脉冲灌洗法冲洗松质骨，然后将标本嵌入特制的容器中。真空混合后，以逆行方式注入骨水泥，并在3000 N的恒定力作用下进行标准压力方案处理。拍摄X线片，并使用金刚石锯在预定水平获取水平切片。对骨切片进行显微放射摄影、数字化处理和分析，以评估骨水泥向松质骨的渗透情况。两种制备技术均未导致股骨骨折或骨裂。显微放射摄影评估显示，在骨水泥向松质骨的渗透方面，碎齿拉刀和机器人铣削技术之间没有形态学差异。因此，在存在脉冲灌洗的情况下，我们得出结论，机器人骨制备不会增加骨水泥向股骨近端松质骨的渗透。
