Correlation Between Lower Limb Force Line And Knee Joint Function After Total Knee Arthroplasty In Inner Mongolia

Objective: To analyze the relationship between lower limb force line and knee joint function in Total Knee Arthroplasty(TKA)in Inner Mongolia,and to compare the mechanical strength of lower limbs in Chinese and Mongolian TKA patients in Inner Mongolia.Under the line,there is no significant difference in clinical effects and knee function.Therefore,it is determined that the TKA lower limb force line suitable for the local people in the region is allowed to deviate from the neutral position,providing data reference for the reconstruction of the lower limb line in the Inner Mongolia region.Methods: According to the retrospective study of inclusion criteria,102 patients(125 knees)of various knee arthritis patients underwent total knee arthroplasty from January 2016 to December 2018 in our department of orthopedics.All patients underwent full-length lower limbs before and after surgery.The mechanical axis angle between femur and tibia(MFTA)was measured before and after surgery.The MFTA was grouped by postoperative measurement.The patients were divided into?MFTA?= 0°group,?MFTA?= 1°group,?MFTA?= 3 °group,?MFTA?? 3 °group and?MFTA?> 3°group and were followed up.For postoperative 6 weeks,3 months,and 6 months,the postoperative knee motion(Range of motion,ROM)and the US Department of Special Surgery(HSS)were used to evaluate the postoperative outcome of TKA and knee.Joint function.The obtained data were collated with EXCEL2007,and the data were further statistically analyzed using SPSS 23.0 statistical software.All data were recorded as mean ± standard deviation.Paired samples were used for pre-operative and post-operative data and post-operative data.The test,independent sample t test and one-way ANOVA were used for statistical comparison.Results: 1.Using 3° as the standard for measuring the axial force line of lower limbs,in the range of?MFTA?< 3°,the knee joint ROM of Mongolian and Han TKA patients in Inner Mongolia was 6 weeks,3 months and 6 months after operation.There was no significant difference between HSS scores(P>0.05).2.?MFTA?=0° group,?MFTA?=1° group and?MFTA?=3° group.Outside the knee joint ROM,the?MFTA? =0° group and the?MFTA?=3°group,the?MFTA?=1° group and the?MFTA?=3° group were statistically significant(P<0.05).The ? MFTA ? =0° group and the ? MFTA ? =1° group had nosignificant difference in HSS score and knee joint ROM at different time points(P>0.05).3.Using 3° as the standard for measuring the axial force line of lower limbs,the HSS score and knee ROM of the?MFTA??3° group were higher than those of the?MFTA?>3° group.The difference was statistically significant.(P<0.05).4.The ROM and HSS scores of the knee joints before and after TKA were compared.The HSS scores and knee ROM of the knees were significantly higher than those before operation(P<0.05).Conclusion: 1.The first comparison of this article: the short-term clinical effect and knee function of Mongolian and Han TKA patients in Inner Mongolia are similar,there is no significant difference.2.In the range of?MFTA?<3°,the smaller the angle of internal and external valgus of lower limbs,the higher the HSS score and the knee ROM after TKA,the inverse relationship between them,that is,the angle of correction of lower limbs is infinitely close to neutral.The postoperative effect is best when the position is corrected to the neutral position.3.The mechanical axis of the lower extremity was corrected within 3°,and the early postoperative effect and knee function were significantly improved.On the contrary,greater than 3°,the early clinical outcome and knee function recovery after TKA were poor.4.Total knee arthroplasty is an effective treatment for advanced knee disease.