Chiu K Y, Yau W P, Ng T P, Tang W M
Division of Joint Replacement Surgery, Department of Orthopedics and Traumatology, The University of Hong Kong, Hong Kong, China.
Int Orthop. 2008 Aug;32(4):467-71. doi: 10.1007/s00264-007-0354-5. Epub 2007 Mar 16.
Anteroposterior radiographs that included the whole tibia were taken before and after 75 total knee arthroplasties in 48 patients. The same tibial extra-medullary alignment guide system was used in every knee. The average tibial component alignment was 0.4 (SD 2.5, range -4.9 to 6.4) degrees of valgus post-operatively. 59 tibial components (78.7%) had a tibial cut within 3 degrees from being perpendicular to the mechanical axis, ten were too valgus (13.3%) and six were too varus (8%). The chance of the tibial components becoming too varus was higher if there was lateral tibial bowing, compared with no tibial bowing (p=0.048). A smaller lateral width of the leg increased the chance of the tibial components becoming too valgus (p=0.047).
对48例患者的75次全膝关节置换术前和术后拍摄包含整个胫骨的前后位X线片。每个膝关节均使用相同的胫骨髓外对线引导系统。术后胫骨假体平均对线为外翻0.4°(标准差2.5,范围-4.9至6.4°)。59个胫骨假体(78.7%)的胫骨截骨与机械轴垂直偏差在3°以内,10个外翻过大(13.3%),6个内翻过大(8%)。与无胫骨弓形相比,存在胫骨外侧弓形时胫骨假体出现内翻过大的可能性更高(p = 0.048)。小腿外侧宽度较小会增加胫骨假体出现外翻过大的可能性(p = 0.047)。