title: Medial Unicondylar Knee Arthroplasty Improves Patellofemoral Congruence: a Possible Mechanistic Explanation for Poor Association Between Patellofemoral Degeneration and Clinical Outcome.
abstract: The purpose was to determine the effect of medial fixed bearing unicondylar knee arthroplasty (UKA) on postoperative patellofemoral joint (PFJ) congruence and analyze the relationship of preoperative PFJ degeneration on clinical outcome. We retrospectively reviewed 110 patients (113 knees) who underwent medial UKA. Radiographs were evaluated to ascertain PFJ degenerative changes and congruence. Clinical outcomes were assessed preoperatively and postoperatively. The postoperative absolute patellar congruence angle (10.05 ± 10.28) was significantly improved compared with the preoperative value (14.23 ± 11.22) (P = 0.0038). No correlation was found between preoperative PFJ congruence or degeneration severity, and WOMAC scores at two-year follow up. Pre-operative PFJ congruence and degenerative changes do not affect UKA clinical outcomes. This finding may be explained by the post-op PFJ congruence improvement.
authors.affiliation: Computer Assisted Surgery Center, Department of Orthopedic Surgery, Hospital for Special Surgery, Weill Medical College of Cornell University, New York, New York.
authors.forename: Ran
authors.initials: R
authors.lastname: Thein
authors.affiliation: Computer Assisted Surgery Center, Department of Orthopedic Surgery, Hospital for Special Surgery, Weill Medical College of Cornell University, New York, New York.
authors.forename: Hendrik A
authors.initials: HA
authors.lastname: Zuiderbaan
authors.affiliation: Computer Assisted Surgery Center, Department of Orthopedic Surgery, Hospital for Special Surgery, Weill Medical College of Cornell University, New York, New York.
authors.forename: Saker
authors.initials: S
authors.lastname: Khamaisy
authors.affiliation: Computer Assisted Surgery Center, Department of Orthopedic Surgery, Hospital for Special Surgery, Weill Medical College of Cornell University, New York, New York.
authors.forename: Danyal H
authors.initials: DH
authors.lastname: Nawabi
authors.affiliation: Adult Reconstruction and Joint Replacement, Department of Orthopedic Surgery, Hospital for Special Surgery, Weill Medical College of Cornell University, New York, New York.
authors.forename: Lazaros A
authors.initials: LA
authors.lastname: Poultsides
authors.affiliation: Computer Assisted Surgery Center, Department of Orthopedic Surgery, Hospital for Special Surgery, Weill Medical College of Cornell University, New York, New York.
authors.forename: Andrew D
authors.initials: AD
authors.lastname: Pearle
mesh_terms: D000368:Aged; D019645:Arthroplasty, Replacement, Knee / Q000706:statistics & numerical data*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D020370:Osteoarthritis, Knee / Q000601:surgery; D010329:Patella / Q000000981:diagnostic imaging / Q000502:physiology; D057071:Patellofemoral Joint / Q000000981:diagnostic imaging / Q000502:physiology*; D011859:Radiography; D012189:Retrospective Studies
keywords: clinical follow-up; congruence; fixed bearing; patellofemoral joint; unicondylar knee arthroplasty