title: Femoroacetabular impingement and comparison of radiological indexes: a study on 50 cases.
abstract: To study the asphericity of femoral head in femoroacetabular impingement using radiological indices such as alpha angle and triangular index, and to compare the alpha angle and triangular index measured in the radiograph and MRI. The study was conducted prospectively from January 2008 to June 2009 on 50 consecutive patients of suspected cam-type FAI hip, reporting to orthopedics outpatients department of Postgraduate Institute of Medical Education and Research. Radiograph of the affected hip was taken, and then alpha angle and triangular index are measured and compared. The mean alpha angle in anteroposterior view was measured as 75° ± 10°, and the mean in lateral view was 740 ± 80. In MRI the mean alpha angle was 79° ± 9°. The mean triangular index in radiograph was 2.9 ± 1.2. In MRI the mean triangular index was 2.6 ± 0.8. Frog-leg lateral view is sufficient for the diagnosis of the cam-type femoroacetabular impingement. But MRI is required in cases, where surgical intervention is planned to rule out other pathological condition and for decision making.
authors: Department of Orthopaedics, Postgraduate Institute of Medical Research and Education, Sector-12, Chandigarh, India. raji7dr7@gmail.com
authors: R
authors: R
authors: Kumar
authors: A
authors: A
authors: Aggarwal
authors: V
authors: V
authors: Krishnan
authors: N
authors: N
authors: Gopinathan
authors: S
authors: S
authors: Chakraborty
mesh_terms: D005260:Female; D057925:Femoracetabular Impingement / Q000000981:diagnostic imaging* / Q000473:pathology*; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies; D011859:Radiography
references: J Bone Joint Surg Am. 1999 Dec;81(12):1747-70
references: 10608388
references: J Bone Joint Surg Br. 2002 May;84(4):556-60
references: 12043778
references: J Bone Joint Surg Br. 2001 Mar;83(2):171-6
references: 11284559
references: J Bone Joint Surg Br. 2007 Oct;89(10):1309-16
references: 17957069
references: Clin Orthop Relat Res. 2006 Apr;445:181-5
references: 16456309
references: Clin Orthop Relat Res. 2004 Dec;(429):170-7
references: 15577483
references: Clin Orthop Relat Res. 2007 Sep;462:115-21
references: 17589367
references: Clin Orthop Relat Res. 2003 Dec;(417):112-20
references: 14646708
references: J Bone Joint Surg Br. 2005 Jul;87(7):1012-8
references: 15972923
references: J Orthop Sci. 2004;9(3):256-63
references: 15168180
references: J Bone Joint Surg Br. 1999 Mar;81(2):281-8
references: 10204935