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KMID : 0359620070190020218
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Journal of Korean Knee Society
2007 Volume.19 No. 2 p.218 ~ p.224
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Influence of Posterior Tibial Slope on Stability after Total Knee Arthroplasty
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Seo Jai-Gon
Moon Young-Wan
Kim Jong-Hyun
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Abstract
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Purpose : The purpose of this study was to compare the influence of posterior tibial slope on hyperextension deformities and anterior tibial translation between two types of total knee arthroplasty(TKA); posterior cruciate retaining(CR) and substituting(PS), which have different polyethylene conformity.
Materials & Methods : 109 consecutive primary TKAs using Nexgen(R)(Zimmer, Warsaw, IN) CR(n=60) and PS (n=49) type prostheses, performed from July 1995 to August 2005 were reviewed. Each group of CR and PS were divided into two categories according to the degree of posterior tibial slope; 0~5 degrees and more than 5 degrees. The amount of hyperextension deformities and anterior tibial translation measured at the immediate and postoperative 2 years radiographs were analyzed in each subdivided groups.
Results : The significant amount of hyperextension deformities(p<0.05) and anterior tibial translation(p<0.05) were noted in the CR group. The CR group with more than 5 degrees of posterior tibial slope was more prone to develop the hype- rextension deformities(p=0.003) and anterior tibial translation(p=0.007) compared with the group that has posterior tibial slope less than 5 degrees. But in the PS group, there was no significant difference related with hyperextension deformities (p =0.240) and anterior tibial translation(p=0.204) between the two groups.
Conclusion : The posterior tibial slope more than 5 degrees resulted in increments of the hyperextension and anterior tibial translation in the CR TKA group than in the PS TKA group.
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KEYWORD
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Hyperextension, Total knee arthroplasty, Posterior tibial slope, CR, PS
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