title: Survivorship and functional outcomes of patellofemoral arthroplasty: a systematic review.
abstract: OBJECTIVE
  Historically poor results of survivorship and functional outcomes of patellofemoral arthroplasty (PFA) have been reported in the setting of isolated patellofemoral osteoarthritis. More recently, however, fairly good results of PFA were reported, but the current status of PFA outcomes is unknown. Therefore, a systematic review was performed to assess overall PFA survivorship and functional outcomes.
  
  
  METHODS
  A search was performed using PubMed, Embase and Cochrane systems, and the registries were searched. Twenty-three cohort studies and one registry reported survivorship using Kaplan-Meier curve, while 51 cohort studies reported functional outcomes of PFA.
  
  
  RESULTS
  Twelve studies were level II studies, while 45 studies were level III or IV studies. Heterogeneity was mainly seen in type of prosthesis and year the cohort started. Nine hundred revisions in 9619 PFAs were reported yielding 5-, 10-, 15- and 20-year PFA survivorships of 91.7, 83.3, 74.9 and 66.6 %, respectively, and an annual revision rate of 2.18. Functional outcomes were reported in 2587 PFAs with an overall score of 82.2 % of the maximum score. KSS and Knee Function Score were 87.5 and 81.6 %, respectively.
  
  
  CONCLUSIONS
  This systematic review showed that fairly good results of PFA survivorship and functional outcomes were reported at short- and midterm follow-up in the setting of isolated patellofemoral osteoarthritis. Heterogeneity existed mainly in prosthesis design and year the cohort started.
  
  
  CONCLUSIONS
  These results provide a clear overview of the current status of PFA in the setting of isolated patellofemoral osteoarthritis.
  
  
  METHODS
  IV.
authors.affiliation: Department of Orthopaedic Surgery, Computer Assisted Surgery Center, Hospital for Special Surgery, Weill Medical College of Cornell University, 535 E. 70th Street, New York, NY, 10021, USA. vanderlistj@hss.edu.
authors.forename: J P
authors.initials: JP
authors.lastname: van der List
authors.affiliation: Department of Orthopaedic Surgery, Computer Assisted Surgery Center, Hospital for Special Surgery, Weill Medical College of Cornell University, 535 E. 70th Street, New York, NY, 10021, USA.
authors.forename: H
authors.initials: H
authors.lastname: Chawla
authors.affiliation: Department of Orthopaedic Surgery, Spaarne Hospital, Hoofddorp, The Netherlands.
authors.forename: H A
authors.initials: HA
authors.lastname: Zuiderbaan
authors.affiliation: Department of Orthopaedic Surgery, Computer Assisted Surgery Center, Hospital for Special Surgery, Weill Medical College of Cornell University, 535 E. 70th Street, New York, NY, 10021, USA.
authors.forename: A D
authors.initials: AD
authors.lastname: Pearle
mesh_terms: D019645:Arthroplasty, Replacement, Knee / Q000379:methods*; D006801:Humans; D007719:Knee Joint / Q000601:surgery; D020370:Osteoarthritis, Knee / Q000601:surgery; D057071:Patellofemoral Joint / Q000601:surgery*; D011474:Prosthesis Design; D012042:Registries; D016896:Treatment Outcome
keywords: Functional outcomes; Isolated patellofemoral osteoarthritis; PFA; Patellofemoral arthroplasty; Survivorship