Clinical comparison of two kinds of tibial prosthesis rotation alignment techniques in total knee arthroplasty
DONG Yue-fu1 WANG Guo-dong1 ZHANG-Zhen2 MOU Zhi-fang3 JIANG Sheng-bo1 LIU Xu-dong1 LIU-Jian1▲
1.Department of Orthopedics,the Affiliated Lianyungang Hospital of Xuzhou Medical University （the First People′s Hospital of Lianyungang）
2.School of Materials Engineering,Shanghai University of Engineering Science
3.Department of Critical Care Medicine,the Affiliated Lianyungang Hospital of Xuzhou Medical University (the First People′s Hospital of Lianyungang),
Abstract：Objective To investigate the clinical effect of two kinds of alignment technique in Total knee arthroplasty(TKA) on the reduction of rotation malalignment of tibial prosthesis.Methods A total of 60 cases who received primary TKA surgery in the Affiliated Lianyungang Hospital of Xuzhou Medical University(the First People′s Hospital of Lianyungang) from April 2015 to April 2019 were divided into groups A and B based on the simple random number table method,with 30 patients in each group.Group A: rotation alignment technique of tibial prosthesis based on Akagi line,Group B: based on Insall line.At the last follow-up,the clinical efficacy after TKA was evaluated according to knee society score (KSS),and the rotation angle of tibial prosthesis was measured using CT image data.Results A total of 60 patients were followed up for 12 to 48 months,with an average of (22.9±5.5) months.The KSS score at the last followup after operation was higher than that before the operation,and the difference was statistically significant (P＜0.05);there was no significant difference in the KSS score between the groups before and at the last follow-up (P＞0.05).There was no statistically significant difference in the overall excellent and good rate between the two groups (P＞0.05);at the last follow-up,the overall angle of external rotation of tibial prosthesis in the A group ([3.2±1.3]°) was better than that in the B group ([6.4±3.2]°),and the difference was statistically significant (P＜0.05).The external rotation angle of tibial prosthesis in A group was less than that in B group,and the internal rotation angle was greater than that in B group (P＜0.05).The ratio of external rotation of tibial prosthesis in group A was lower than that in group B,while the ratio of internal rotation was higher than that in group B,the difference was statistically significant (P＜0.05).Conclusion The technique based on Akagi line can effectively reduce the malalignment of tibial prosthesis after TKA,which is better than the technique based on Insall line method.
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