Davies J P, Harris W H
Orthopaedic Biomechanics Laboratory, Massachusetts General Hospital, Boston, USA.
J Appl Biomater. 1995 Fall;6(3):209-11. doi: 10.1002/jab.770060311.
Reducing the porosity of bone cement substantially strengthens the cement in fatigue. However, concern has been raised that reducing the porosity of the cement would increase the shrinkage of the cement and thus compromise the cement-bone interface. We measured diametral shrinkage of cement mantles prepared with and without centrifugation of the cement. Four cement preparations (centrifuged and uncentrifuged mixed with monomer at either room temperature or 0 degrees C) were used to form cement mantles of four different thicknesses (2, 4, 6, and 8 mm) around a stainless steel rod. We conclude that porosity reduction dramatically increases the fatigue strength of bone cement without substantially changing the diametral dimensions of the polymerized cement when studied in the shape and volume of a cement mantle that would be used for total hip replacement.
大幅降低骨水泥的孔隙率可显著增强其疲劳强度。然而，有人担心降低水泥孔隙率会增加水泥的收缩率，从而损害水泥与骨的界面。我们测量了通过对水泥进行离心和不进行离心制备的水泥套的径向收缩率。使用四种水泥制剂（在室温或0摄氏度下离心和未离心并与单体混合）在不锈钢棒周围形成四种不同厚度（2、4、6和8毫米）的水泥套。我们得出结论，在研究用于全髋关节置换的水泥套的形状和体积时，降低孔隙率可显著提高骨水泥的疲劳强度，而不会显著改变聚合水泥的径向尺寸。
