title: Prevalence of radiological signs of femoroacetabular impingement in patients presenting with long-standing adductor-related groin pain.
abstract: OBJECTIVE
  A decreased range of motion (ROM) of the hip joint is known to predispose to athletic groin injury. Femoroacetabular impingement (FAI) of the hip leads to a reduced ROM. This study examined the prevalence of radiological signs of FAI in patients presenting with long-standing adductor-related groin pain (LSARGP).
  
  
  METHODS
  Prospective case series.
  
  
  METHODS
  Outpatient Sports Medicine Department.
  
  
  METHODS
  34 athletes with LSARGP defined as pain on palpation of the proximal insertion of adductor muscle and a painful, resisted adduction test.
  
  
  RESULTS
  A clinician blinded to the results of the radiological assessment performed a physical examination: iliopsoas length, hip ROM and anterior hip impingement test. Anteroposterior pelvic radiographs were examined by a second blinded clinician for the presence of: pistol grip deformity, centrum-collum-diaphyseal angle, femoral head neck ratio, coxa profunda, protrusio acetabuli, lateral centre edge angle, acetabular index and cross-over sign.
  
  
  RESULTS
  The prevalence of radiological signs of FAI was 94% (64/68). The mean number of radiological signs in hips with LSARGP was 1.84 (range 0-4, SD 1.05) and 1.96 (range 0-5, SD 1.12) in asymptomatic groins (p=0.95). The anterior hip impingement test was positive in nine cases. There was no relationship with the number of radiological signs (p=0.95). There was no correlation between hip ROM and the number of radiological signs (p=0.37).
  
  
  CONCLUSIONS
  Radiological signs of FAI are frequently observed in patients presenting with LSARGP. Clinicians should be aware of this fact and the possible lack of correlation when assessing athletes with groin pain.
authors.affiliation: Sports Medicine Department, The Hague Medical Centre, Antoniushove Hospital, Leidschendam, The Netherlands. a.weir@mchaaglanden.nl
authors.forename: A
authors.initials: A
authors.lastname: Weir
authors.forename: R J
authors.initials: RJ
authors.lastname: de Vos
authors.forename: M
authors.initials: M
authors.lastname: Moen
authors.forename: P
authors.initials: P
authors.lastname: Hölmich
authors.forename: J L
authors.initials: JL
authors.lastname: Tol
mesh_terms: D000293:Adolescent; D000328:Adult; D059350:Chronic Pain / Q000000981:diagnostic imaging / Q000209:etiology* / Q000503:physiopathology; D057925:Femoracetabular Impingement / Q000150:complications / Q000000981:diagnostic imaging* / Q000503:physiopathology; D006119:Groin; D006552:Hernia, Inguinal / Q000150:complications / Q000000981:diagnostic imaging; D006801:Humans; D059352:Musculoskeletal Pain / Q000000981:diagnostic imaging / Q000209:etiology* / Q000503:physiopathology; D010808:Physical Examination; D011446:Prospective Studies; D011859:Radiography; D016059:Range of Motion, Articular / Q000502:physiology; D013177:Sports; D055815:Young Adult