TITLE:
Patellofemoral Outcome after Medial Unicompartmental Knee Replacement: A Retrospective Study of 25 Cases
AUTHORS:
Nader Naouar, Hamdi Kaziz, Thabet Mouelhi, Mohamed Amine Triki, Walid Osmane, Mohamed Laziz Ben Ayeche
KEYWORDS:
Patellofemoral, Unicompartimental, Arthroplasty, Outcome
JOURNAL NAME:
Open Journal of Orthopedics,
Vol.7 No.10,
October
16,
2017
ABSTRACT: Introduction: Osteoarthritis and impingement, in patellofemoral compartment after partial
arthroplasty, have been rarely reported. The purpose of our study was to
evaluate outcome at long-term follow-up. Methods: We have reviewed
retrospectively twenty-five unicompartmental
arthroplasties. The medial parapatellar approach was used in all cases.
Patients have been evaluated with regard to patellar impingement and
osteoarthritic changes revealed by radiographs. The mean follow-up was 10.4 years. The clinical scoring system of the Knee
Society and specific questions regarding patellofemoral symptoms were used for
functional outcome. Patellofemoral complications such as osteoarthritis,
impingement and the position of the femoral component were diagnosed on X-ray
views of the knee. Results: At the final follow-up, fifteen knees revealed
lateral patellofemoral osteoarthritis and four knees had patellofemoral impingement.
Excepted of two cases, all knees with patella impingement did not revealed
degenerative modifications. Anterior pain of the knee was noted more frequently
in knees with patellar complications. Patellar impingement was considered the
first cause of knee pain, more
than knees with degenerative modifications. Only one revision surgery was
indicated in front of patellofemoral conflict. The occurrence of patellar
impingement depends on the surgical procedure. The anterior position of the
femoral component seems to increase
the frequency of such complication. Conclusion: Several degenerative modifications may occur in
the patello-femoral compartment following partial knee arthroplasty. Patellar
impingement and total knee arthritis are the most reported modifications. Functional
outcome may be affected progressively when these changes become obvious.
Patellar impingement is the major cause of knee pain and needs revision.