Medial Unicondylar Knee Arthroplasty Improves Patellofemoral Congruence: A Possible Mechanistic Explanation for Poor Association Between Patellofemoral Degeneration and Clinical Outcome

Ran Thein, Hendrik A. Zuiderbaan, Saker Khamaisy, Danyal H. Nawabi, Lazaros A. Poultsides, Andrew D. Pearle

Research output: Contribution to journalArticlepeer-review

27 Scopus citations

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.

Original languageEnglish
Pages (from-to)1917-1922
Number of pages6
JournalJournal of Arthroplasty
Volume30
Issue number11
DOIs
StatePublished - Nov 2015
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2015 Elsevier Inc..

Keywords

  • Clinical follow-up
  • Congruence
  • Fixed bearing
  • Patellofemoral joint
  • Unicondylar knee arthroplasty

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