title: Postoperative femoral component rotation and femoral anteversion after total knee arthroplasty in patients with distal femoral deformity.
abstract: We asked whether total knee arthroplasty (TKA) in patients with distal femoral deformity (DFD) would change femoral component rotation (FCR) and investigated the correlation between DFD and femoral anteversion (FA). 75 patients were divided into two groups according to the preoperative posterior condylar angle (PCA); group A without DFD (PCA<7°), group B with DFD (PCA>7°). We evaluated the different angles on the CT scan: (1) PCA, (2) angle between the line which is perpendicular to the Whiteside's line and PCL (WLP), and (3) FA. The mean FCRs were external rotation of 0.21°+2.75° in group A and internal rotation of 4.48°+2.51° in group B (P=0.001). The mean preoperative and postoperative FAs were similar in group A but were significantly different in group B (P=0.035). DFD resulted in excessive internal rotation of the femoral component. There was a secondary decrease in FA in patients with DFD.
authors.affiliation: Department of Orthopaedic Surgery, Korea University Medical Center, Guro Hospital, Seoul, South Korea.
authors.forename: Hong-Chul
authors.initials: HC
authors.lastname: Lim
authors.forename: Ji-Hoon
authors.initials: JH
authors.lastname: Bae
authors.forename: Seung-Ju
authors.initials: SJ
authors.lastname: Kim
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D019645:Arthroplasty, Replacement, Knee / Q000379:methods*; D005260:Female; D005269:Femur / Q000000981:diagnostic imaging / Q000601:surgery*; D006801:Humans; D008297:Male; D008875:Middle Aged; D016059:Range of Motion, Articular; D012189:Retrospective Studies; D012399:Rotation; D018709:Statistics, Nonparametric; D014057:Tomography, X-Ray Computed; D016896:Treatment Outcome
keywords: distal femoral deformity; femoral anterversion; femoral component rotation; total knee arthroplasty