Race A, Miller M A, Ayers D C, Cleary R J, Mann K A
Institute for Human Performance, Musculoskeletal Science Research Centre, SUNY Upstate Medical University, Syracuse, New York 13210, USA.
J Bone Joint Surg Br. 2002 Nov;84(8):1199-204. doi: 10.1302/0301-620x.84b8.12598.
We have compared the interface morphology at the stem-cement interface of standard Charnley stems with a satin finish (Ra = 0.75 microm) with identical stems which had been grit-blasted over their proximal third (Ra = 5.3 microm) to promote a proximal bond. The stems were cemented into cadaver femora using conventional contemporary cementing techniques. After transverse sectioning, we determined the percentage of the perimeter of the stem which had a gap at the interface. There were substantial gaps (mean 31.4 +/- 17.1%) at the stem-cement interface in the grit-blasted region. This fraction was significantly (paired t-test, p = 0.0054) higher than that found around the contralateral satin-finished stems (mean 7.7 +/- 11.7%). Although studies of isolated metal-cement interfaces have shown that the bond strength can increase with surface roughness it cannot be assumed that this effect will be observed under clinical conditions.
我们比较了表面为缎面处理（Ra = 0.75微米）的标准Charnley股骨柄与近端三分之一经过喷砂处理（Ra = 5.3微米）以促进近端骨水泥固定的相同股骨柄在柄-骨水泥界面处的界面形态。使用传统的现代骨水泥固定技术将股骨柄固定到尸体股骨中。横切后，我们确定了柄在界面处有间隙的周长百分比。在喷砂处理区域的柄-骨水泥界面处存在大量间隙（平均31.4 +/- 17.1%）。该比例显著高于对侧缎面处理柄周围的间隙比例（平均7.7 +/- 11.7%）（配对t检验，p = 0.0054）。尽管对孤立的金属-骨水泥界面的研究表明，粘结强度会随着表面粗糙度的增加而提高，但不能假定在临床条件下也会观察到这种效果。
