Knutson K, Jónsson G, Langer Andersen J, Lárusdóttir H, Lidgren L
Acta Orthop Scand. 1981 Dec;52(6):667-73. doi: 10.3109/17453678108992165.
Roentgenological signs of deformation and loosening of the tibial component in knee arthroplasties with unicompartmental endoprostheses occurred in one-third of 87 rheumatoid (RA) knees within 2 years and in one-fifth of 107 osteoarthritic (OA) knees within 3 years after the operation. Compared with thicker components significantly more 6 mm components in RA, and 6 and 9 mm components in OA became deformed and loose. There was no difference in the clinical assessment of the knees with and without deformed tibial components. Reoperations were recorded during an extended follow-up. In the group with initially asymptomatic loosening twelve RA knees within four and a half years and three OA knees within four years developed pain on weight-bearing and had to be reoperated. One patient (OA) had loose components without any roentgenological signs; the loosening was first discovered when the unoperated compartment was revised because of secondary osteoarthrosis. Knees fitted with 6 mm components more often required reoperation because of loosening than did those with thicker components.
在单髁膝关节置换术中，胫骨假体出现变形和松动的影像学表现，在87例类风湿性关节炎（RA）膝关节中有三分之一在术后2年内出现，在107例骨关节炎（OA）膝关节中有五分之一在术后3年内出现。与较厚的假体相比，RA中6mm的假体以及OA中6mm和9mm的假体明显更易出现变形和松动。胫骨假体有无变形的膝关节在临床评估上并无差异。在延长随访期间记录了再次手术情况。在最初无症状性松动的组中，12例RA膝关节在四年半内、3例OA膝关节在四年内出现负重时疼痛，不得不再次手术。1例患者（OA）假体松动但无任何影像学表现；当因继发性骨关节炎对未手术间室进行翻修时才首次发现松动。与较厚假体的膝关节相比，安装6mm假体的膝关节因松动而更常需要再次手术。
