title: Patellofemoral arthroplasty for symptomatic nonunion after trochlear osteotomy for patellar instability: a case report.
abstract: BACKGROUND
  Patients with patellofemoral instability with trochlear dysplasia may be treated with trochlear osteotomy.
  
  
  METHODS
  We present a patient with patellofemoral instability treated with trochlear osteotomy. The procedure resulted in nonunion with painful bony impingement and isolated patellofemoral osteoarthritis. Patellofemoral arthroplasty was performed.
  
  
  CONCLUSIONS
  Patellofemoral arthroplasty may be considered a salvage procedure for failed surgical treatment for trochlear dysplasia.
authors.affiliation: Department of Orthopaedic Surgery, Deventer Hospital, Nico Bolkesteinlaan 75, 7416 SE Deventer, The Netherlands.
authors.forename: Hans-Peter W
authors.initials: HP
authors.lastname: van Jonbergen
authors.forename: Kees
authors.initials: K
authors.lastname: van Egmond