title: [The relationship between chronic hip pain and femoroacetabular impingement: an evaluation with clinical signs and radiography].
abstract: OBJECTIVE
  In this study, we investigated the rate of the clinical and radiographic findings of femoroacetabular impingement (FAI) in patients with chronic hip pain and compared the findings with those of a control group.
  
  
  METHODS
  The clinical and radiographic findings of FAI in 38 patients (group 1) having hip pain for more than three months were analyzed and compared with 42 controls (group 2). Internal rotation degrees were measured while the hips were at 90° flexion and impingement test was performed by rotating the hips internally at 90° flexion and adduction. The FAI findings were investigated on anteroposterior pelvis radiographs and cross-table lateral radiographs of the hip joint in both groups. The collum-diaphyseal angle, alpha angle and anterior offset ratio on the femoral side and the center-edge angle, acetabular index, extrusion index and crossover sign on the acetabular side were evaluated.
  
  
  RESULTS
  The internal rotation degree of the painful hips were less than 20 degree in 18 (47.4%) patients in group 1 and in one (2.4%) patient in group 2 (p<0.001). The impingement sign was positive in 15 (39.5%) patients in group 1 and in one (2.4%) patient in group 2 (p<0.001). While the rate of radiographic findings that can cause pincer type FAI were same in both groups, the rate of patients with radiographic findings that can cause cam type FAI was 76.3% (n=29) in group 1 and 42.9% (n=18) in group 2 (p=0.002).
  
  
  CONCLUSIONS
  Femoroacetabular impingement is one of the causes of chronic hip pain and if evaluated with suitable clinical and radiographic parameters, the rates of diagnosis may increase.
authors.affiliation: Department of Orthopedics and Traumatology, Bursa Şevket Yılmaz Training and Research Hospital, Turkey. sahinnamik@yahoo.com
authors.forename: Namik
authors.initials: N
authors.lastname: Sahin
authors.forename: Teoman
authors.initials: T
authors.lastname: Atici
authors.forename: Alpaslan
authors.initials: A
authors.lastname: Oztürk
authors.forename: Güven
authors.initials: G
authors.lastname: Ozkaya
authors.forename: Bülent
authors.initials: B
authors.lastname: Avcu
authors.forename: Yüksel
authors.initials: Y
authors.lastname: Ozkan
mesh_terms: D000328:Adult; D016022:Case-Control Studies; D059350:Chronic Pain / Q000209:etiology; D003952:Diagnostic Imaging; D005260:Female; D057925:Femoracetabular Impingement / Q000150:complications / Q000000981:diagnostic imaging*; D006801:Humans; D008297:Male; D008875:Middle Aged; D010147:Pain Measurement; D010148:Intractable Pain / Q000209:etiology*; D011859:Radiography; D016059:Range of Motion, Articular; D055815:Young Adult