title: Protocol for CT in the position of discomfort: preoperative assessment of femoroacetabular impingement - how we do it and what the surgeon wants to know.
abstract: BACKGROUND
  The use of computed tomography of the hip in a position of discomfort (CT-POD) in combination with 2D and 3D surface rendering is a technique increasingly used to aid in the assessment and confirmation of femoral and acetabular bony abnormalities related to femoroacetabular impingement. The purpose of this article is to describe this dynamic method of assessment.
  
  
  METHODS
  Patients referred by orthopaedic surgeons for assessment of femoroacetabular impingement as part of preoperative planning and patients who required postoperative assessment of residual bony abnormalities were selected.
  
  
  RESULTS
  This article describes the CT-POD technique and the information required by the referring surgeon.
  
  
  CONCLUSIONS
  CT-POD is a new technique that provides valuable preoperative and postoperative information to the surgeon.
authors.affiliation: Victoria House Medical Imaging, Melbourne, Victoria, Australia.
authors.forename: Rafal
authors.initials: R
authors.lastname: Grabinski
authors.forename: Daniel
authors.initials: D
authors.lastname: Ou
authors.forename: Kate
authors.initials: K
authors.lastname: Saunder
authors.forename: Andrew
authors.initials: A
authors.lastname: Rotstein
authors.forename: Parminder
authors.initials: P
authors.lastname: Singh
authors.forename: Michael
authors.initials: M
authors.lastname: Pritchard
authors.forename: John
authors.initials: J
authors.lastname: O'Donnell
mesh_terms: D000077:Acetabulum / Q000002:abnormalities / Q000000981:diagnostic imaging; D000465:Algorithms; D018771:Arthralgia / Q000000981:diagnostic imaging* / Q000209:etiology* / Q000601:surgery; D057925:Femoracetabular Impingement / Q000150:complications* / Q000000981:diagnostic imaging* / Q000601:surgery; D005269:Femur / Q000002:abnormalities / Q000000981:diagnostic imaging; D006801:Humans; D056888:Patient Positioning / Q000379:methods*; D011300:Preoperative Care / Q000379:methods; D014057:Tomography, X-Ray Computed / Q000379:methods*
keywords: CT POD; FAI; computed tomography; femoroacetabular impingement; musculoskeletal; position of discomfort