Asavamongkolkul A, Pongkunakorn A, Harnroongroj T
Department of Orthopaedic Surgery, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok 10700, Thailand.
J Med Assoc Thai. 2003 Jul;86(7):626-33.
Polymethylmethacrylate (PMMA) is often used to fill the large subchondral defects following intralesional curettage of a giant cell tumor of the bone. Many authors have reported the use of Steinmann pins to reinforce the bone cement. However, whether this is of real benefit in improving the stability of the defect is controversial. Thirteen matched pairs of cadaveric distal femurs were obtained and tested in uni-axial compression to determine the strength of this reconstruction. The strength of normal distal femurs was compared with the strength of defective femurs using 5 matched pairs of cadaveric distal femurs. A significant difference between the two groups was demonstrated in the failure load, stiffness, yield point and total energy absorbed to failure (p < 0.05). The second part consisted of eight matched pairs of specimens filled with PMMA alone versus PMMA with Steinmann pin reinforcement. There was no significant difference in failure load, stiffness, yield point and total energy absorbed to failure (p > 0.05). The addition of Steinmann pins did not significantly improve the strength of the subchondral defect reconstruction in uni-axial compression compared with PMMA reconstruction alone.
聚甲基丙烯酸甲酯（PMMA）常用于填充骨巨细胞瘤病灶内刮除术后的大的软骨下骨缺损。许多作者报道了使用斯氏针来增强骨水泥。然而，这在改善缺损稳定性方面是否真的有益存在争议。获取了13对匹配的尸体股骨远端，并进行单轴压缩测试以确定这种重建的强度。使用5对匹配的尸体股骨远端，将正常股骨远端的强度与有缺损股骨的强度进行比较。两组在破坏载荷、刚度、屈服点和破坏时吸收的总能量方面存在显著差异（p<0.05）。第二部分包括8对匹配的标本，分别为单纯填充PMMA与填充有斯氏针增强的PMMA。在破坏载荷、刚度、屈服点和破坏时吸收的总能量方面没有显著差异（p>0.05）。与单纯PMMA重建相比，添加斯氏针在单轴压缩中并没有显著提高软骨下骨缺损重建的强度。
