title: Patellofemoral joint is an under reported joint in MRI knee - A retrospective, cross-sectional study.
abstract: BACKGROUND
  Patellofemoral joint (PFJ) pathology accounts for upto 40% of cases of knee pain. It has been suggested that PFJ pathology may be underreported in Magnetic Resonance Imaging (MRI) Knee reports. The objective of this study was to elucidate whether PFJ was reported in MRI knee reports at our institution.
  
  
  METHODS
  A retrospective review of 103 consecutive Knee MRIs over a 2-month period was performed by an author, blinded to the reports, at our institution. We analysed whether PFJ was mentioned in MRI knee reports and whether any significant PFJ pathology was present in the scans of this cohort. Images were also reviewed for any underlying causes of PFJ pathology such as trochlear dysplasia (TD) that can result in patellar instability or maltracking.
  
  
  RESULTS
  PFJ was not mentioned in 79/103 cases (77%). 24 cases had trochlear dysplasia. There was no association between PFJ reporting and trochlear dysplasia (p value = 0.50).
  
  
  CONCLUSIONS
  PFJ is not mentioned in the majority of Knee MRI reports. PFJ pathology is an important cause of anterior knee and should be reported.
authors.affiliation: Lower Limb Arthroplasty and Reconstructive Surgeon, Department of Orthopaedics, Kettering General Hospital, NHS Foundation Trust, Kettering, NN16 8UZ, UK.
authors.forename: Arun
authors.initials: A
authors.lastname: Khajuria
authors.affiliation: Senior Fellow, Department of Musculoskeletal Radiology, The Royal Orthopaedic Hospital, Birmingham, B31 2AP, UK.
authors.forename: Amit
authors.initials: A
authors.lastname: Shah
authors.affiliation: Honorary Clinical Research Fellow, Department of Surgery and Cancer, Imperial College London, London, W2 1NY, UK.
authors.forename: Ankur
authors.initials: A
authors.lastname: Khajuria
authors.affiliation: Consultant Musculoskeletal Radiology, Department of Radiology, Kettering General Hospital, NHS Foundation Trust, Kettering, NN16 8UZ, UK.
authors.forename: Rajesh
authors.initials: R
authors.lastname: Botchu
keywords: Knee pain; MRI; Patellofemoral joint