Effects of joint line parameters on bone resection in mechanically aligned total knee arthroplasty
Objective:To investigate the effects of joint line parameters on the bone resection of mechanically aligned(MA)total knee arthroplasty(TKA).Methods:A total of 178 patients(201 knees)diagnosed as osteoar-thritis were included,with 171 varus and 30 valgus knees.Virtual osteotomies were performed in the coronal posi-tion using full-length weight-bearing radiographs according to the MA technical,and the reliability of virtual osteot-omies was verified by intraoperative caliper measurements.Correlation analyses were conducted between bone resec-tion and joint line parameters,including mechanical lateral distal femoral angle(mLDFA)and medial proximal tibi-al angle(MPTA).The correlation between intraoperative bone resection adjustments and joint line parameters was analyzed.Results:The varus knees in this study were divided into 2 groups:130(64.7%)femoral valgus in group A and 41(20.4%)femoral varus in group B.The valgus knees were divided into 2 groups:20(10.0%)tibial var-us in group C and 10(5.0%)tibial valgus in group D.In group A,bone resection was positively correlated with mLDFA and MPTA(P<0.05).In group C,bone resection was positively correlated with MPTA(P<0.05).In varus knee,intraoperative bone resection adjustment was negatively correlated with mLDFA and MPTA(P<0.05).In group A,intraoperative bone resection adjustment was negatively correlated with mLDFA(P<0.05).There was no correlation between intraoperative bone resection adjustment and mLDFA and MPTA in valgus knees(P>0.05).Conclusion:When MA-TKA is performed in varus knees with valgus femurs,the bone resection is positively corre-lated with mLDFA and MPTA,whereas intraoperative bone resection adjustment is negatively correlated with mLD-FA,when mLDFA decreases,there is a tendency for intraoperative bone resection adjustment to increase,which can be assessed during preoperative planning for the possibility of intraoperative bone resection adjustment.
total knee arthroplastyosteoarthritisjoint linebone resectionmechanical alignment
NETL
NSTL
万方数据
维普
