Associations between Alpha Angle and Herniation Pit on MRI Revisited in 185 Asymptomatic Hip Joints

• Published in: Korean journal of radiology Vol. 16; no. 6; pp. 1319 - 1325
• Main Authors: Lee, Eunchae, Choi, Jung-Ah
• Format: Journal Article
• Language: English
• Published: Korea (South) The Korean Society of Radiology 01.11.2015; 대한영상의학회
• Subjects: Adolescent; Adult; Age; Aged; Aged, 80 and over; Asymptomatic; Asymptomatic Diseases; Chi-square test; Female; Femur Neck - anatomy & histology; Femur Neck - diagnostic imaging; Gender; Generalized linear models; Hip joint; Hip Joint - anatomy & histology; Hip Joint - diagnostic imaging; Humans; Magnetic Resonance Imaging; Male; Middle Aged; Musculoskeletal Imaging; Prevalence; Radiography; Retrospective Studies; Statistical analysis; Young Adult; Young adults; 방사선과학; Netherlands; Alpha angle; MRI; Hip; Herniation pit
• ISSN: 1229-6929; 2005-8330; 2005-8330
• DOI: 10.3348/kjr.2015.16.6.1319

To evaluate the association between alpha angle and herniation pit on MRI in asymptomatic hip joints and their associations with demographic variables. Hip MRI of 185 asymptomatic hip joints of 105 adults (age 18 to 80 years) from September 2011 through December 2012 were retrospectively studied. Alpha angles were measured on oblique axial MR images by 2 observers. Herniation pit was determined by 1 observer. Size measures, prevalence, and statistical analyses were conducted regarding its association with age, gender, laterality (right or left hip). Intra- and inter-observer agreements were determined by intra-class correlation coefficient. The prevalence of herniation pit in asymptomatic hips was 21.6%. The range of alpha angle was 27.6-65.0 degrees. Seventeen and 16 out of 185 (9.1% and 8.6%) hip joints showed alpha angle of ≥ 55 degrees in first and second measurement sessions, respectively. There was no association between alpha angle ≥ 55 and presence of herniation pit. There was no association between alpha angle ≥ 55 and the size of herniation pit. Inter-observer agreement of alpha angle was 0.485 between first measurements of first vs. second observer, respectively. Intra-observer agreement of alpha angle was 0.654, respectively. Forty (21.6%) of 185 hip joints (35 of 105 patients, 33.3%) had herniation pit, with no difference according to age, gender, or laterality of hip joint. There is no association between alpha angle ≥ 55 degrees and presence of herniation pit or demographic variables.