title: [Individual difference of coronal bowing of femur and its influence on the lower limbs alignment after the total knee arthroplasty].
abstract: Objective:To disclose the correlation between the femur bowing angle(FBA) and vulgas correction angle(VCA), anlysys its influence on the total knee arthroplasty and the lower limbs alignment.Methods:From Janurary 2013 to December 2015, 699 patients who had received total knee arthroplasty(TKA)were collected in the Department of Joint Surgery, China-Japan Friendship. The FBA, VCA, offset of the proximal femur, the lengh of the femur, the neck shaft angle of the femur of the eligible cases from the long leg X-ray were measured.All the data were analysed for the following steps: the FBA's mean value and characteristics of distributation of all the cases; the VCA's mean value and characteristics of distributation of all the cases; correlations between the VCA and the other parameters; divide all the cases into four groups based on the value of FBA : group A(FBA<-3°, 29), group B(-3°≤FBA≤0°, 255), group C(0°<FBA≤3°, 480), group D(FBA>3°, 236)and then plan to cut the distal femur with 5° and 6°, respectively. The percent of ideal alignmental outcome's percentage of every group were compared.Results:The mean Value of the FBA is -7.1--12.1(1.4±2.4)°; the mean Value of the VCA is 2.5--11.9(6.5±1.3)°. The correlation index between VCA and FBA, the neck shaft angle of the femur , offset of the hip joint, the lengh of the femur is 0.72, -0.26, 0.45 and -0.08, perspectively. The theoretical ideal alignment percentage of the 5 degree-valgus-bone cut and 6 degree-valgus-bone cut in every group is group A: 89.7% and 66.5%; group B: 93.7% and 95.7%; group C: 71.9% and 94.6%; group D: 21.2% and 50.8%, respectively.Conclusion:The cases whose femur bowing angles are outliers are common in daily medical practice, so the vulgas correction angles need be ajusted for its significant correlation with FBA. 5 degree-valgus-bone cut or 6 degree-valgus-bone cut could not get the ideal alignment some times.
authors.affiliation: Department of Joint Surgery, China-Japan Friendship Hospital, Beijing 100029, China.
authors.forename: W
authors.initials: W
authors.lastname: Wu
authors.forename: W S
authors.initials: WS
authors.lastname: Guo
authors.forename: L M
authors.initials: LM
authors.lastname: Cheng
authors.forename: Z H
authors.initials: ZH
authors.lastname: Liu
authors.forename: Q D
authors.initials: QD
authors.lastname: Zhang
authors.forename: N F
authors.initials: NF
authors.lastname: Zhang
mesh_terms: D019645:Arthroplasty, Replacement, Knee; D002681:China; D005269:Femur / Q000033:anatomy & histology*; D006801:Humans; D007206:Individuality; D007719:Knee Joint; D035002:Lower Extremity
keywords: Arthroplasty, replacement, knee; Femoral bowing angle; Femur; Leg; X-ray