Ji Hang Kim MD, Presenter: Nothing to Disclose

Jung-Ah Choi MD, Abstract Co-Author: Nothing to Disclose

Guen Young Lee, Abstract Co-Author: Nothing to Disclose

Young Kyun Lee, Abstract Co-Author: Nothing to Disclose

Yong-Chan Ha, Abstract Co-Author: Nothing to Disclose

Heung Sik Kang MD, Abstract Co-Author: Nothing to Disclose

To investigate the prevalence of imaging findings on CT thought to be associated with FAI and associations among them.

Asymptomatic 438 hip joints of 403 consecutive adults ranging from 18 to 40 years of age who underwent Hip CT at our institution due to trauma or unilateral pelvic symptoms between September 2003 and December 2011 were retrospectively studied. All cases were not known to have any symptoms regarding the concerning hip. All images were obtained from 16-, 64- or 256-slice multidetector computed tomography (MDCT) scanner and reformatted using bone algorithm FAI such as alpha angle, femoral head-neck offset, acetabular version angle, and center edge angle. And associations among those parameters were evaluated by calculating the odds ratio (OR) between each of the parameters separately.

Of 438 asymptomatic hip joints we studied, 188 (43%) joints had at least one of following findings: (1) alpha angle >55º, (2) head-neck offset <8mm, (3) acetabular version angle <15º, or (4) center edge angle >40º. At least one of those findings were found in male joints (46%) than female joints (38%). There was a high degree of coexistence (odds ratio [OR] >2) among those findings.

Imaging findings on CT known to be associated with FAI are common in asymptomatic adult hip joints, especially in male subjects, with a high degree of coexistence among the findings(OR >2).

Computed tomographic findings presumed to be associated with femoroacetabular impingement may be seen in a large percentage of asymptomatic adult population.  

Kim, J, Choi, J, Lee, G, Lee, Y, Ha, Y, Kang, H, Prevalence of Imaging Findings on Computed Tomographic (CT) Thought to Be Associated with Femoroacetabular Impingement (FAI) in 438 Asymptomatic Hip Joints.  Radiological Society of North America 2012 Scientific Assembly and Annual Meeting, November 25 - November 30, 2012 ,Chicago IL. http://archive.rsna.org/2012/12029478.html