Anderson A J, Smyth E, Morgan A, Hamer A J
Lower Limb Arthroplasty Unit, Northern General Hospital, Sheffield, UK.
Hip Int. 2007 Apr-Jun;17(2):104-8. doi: 10.1177/112070000701700209.
We studied whether prosthetic femoral stem centralizers have a detrimental effect on the macroporosity of the cement mantle. With pressure and time monitoring identically cast, moulded prosthetic femora had Charnley C-stems implanted. The stems were removed and the cement mantle was sectioned and photographed to record the size and location of voids (macropores). Cement voids were found in 85% of femora when a centralizer was used compared to 20% of the control group (p=0.002). A modular centralizer produced cement voids of a larger volume and more frequent occurrence (p=0.002). The macroporosity of the cement mantle was independent of the rate of implantation (p=0.39). Modern distal stem centralizers therefore increase the incidence of void formation in the cement mantle; although they help guard against malposition of the implant, they may have implications for early loosening.
我们研究了股骨柄假体扶正器是否会对骨水泥壳的大孔隙率产生不利影响。在压力和时间监测相同的情况下，铸造、模制假体股骨植入了Charnley C型柄。取出柄后，将骨水泥壳切片并拍照，以记录孔隙（大孔）的大小和位置。使用扶正器时，85%的股骨中发现了骨水泥孔隙，而对照组为20%（p=0.002）。模块化扶正器产生的骨水泥孔隙体积更大且出现频率更高（p=0.002）。骨水泥壳的大孔隙率与植入速度无关（p=0.39）。因此，现代远端柄扶正器会增加骨水泥壳中孔隙形成的发生率；尽管它们有助于防止植入物位置不当，但可能对早期松动有影响。
