title: Analysis of the patellofemoral congruence angle according to the rotational alignment of the femoral component in navigation-guided TKA.
abstract: The relative femoral resection plane from the posterior condylar axis was determined by the navigation system. The investigators found that there was a relatively variable range of femoral component rotation intraoperatively (0 degrees - 6 degrees) and attempted to determine whether this would affect postoperative patellofemoral congruence. Forty-six varus knees from 34 patients were included in the study; group 1 (15 knees) with 0 degrees or 1 degrees and group 2 (31 knees) with 3 degrees to 6 degrees . The mean (P = .855) and percentage of abnormal values (patellofemoral congruence angle <16 degrees) (P = .193) in preoperative radiographs showed no significant differences between the two groups. In postoperative findings, the mean of patellofemoral congruence angles in group 1 (20.5 degrees) showed a higher tendency than that in group 2 (14.1 degrees), but no statistically significant difference between two groups (P = .089). In conclusion, there was no statistically significant difference in patellofemoral congruence between 2 groups.
authors.affiliation: Department of Orthopaedic Surgery, Samsung Medical Center, Sungkyunkwan University School of Medicine, Ilwon-Dong 50, Kangnam-Gu, Seoul 135710, Korea.
authors.forename: Young-Wan
authors.initials: YW
authors.lastname: Moon
authors.forename: Jai-Gon
authors.initials: JG
authors.lastname: Seo
authors.forename: Jae-Hyuk
authors.initials: JH
authors.lastname: Yang
authors.forename: Min-Soo
authors.initials: MS
authors.lastname: Shon
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D019645:Arthroplasty, Replacement, Knee / Q000379:methods*; D005260:Female; D005269:Femur / Q000473:pathology* / Q000601:surgery*; D006801:Humans; D008297:Male; D008875:Middle Aged; D010329:Patella / Q000473:pathology* / Q000601:surgery*; D025321:Surgery, Computer-Assisted / Q000379:methods*; D016896:Treatment Outcome; D014584:User-Computer Interface