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

Lee E, Choi JA - Korean J Radiol (2015)

Bottom Line: 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.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.

View Article: PubMed Central - PubMed

Affiliation: Department of Radiology, Seoul National University Bundang Hospital, Seongnam 13620, Korea.

ABSTRACT

Objective: To evaluate the association between alpha angle and herniation pit on MRI in asymptomatic hip joints and their associations with demographic variables.

Materials and methods: 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.

Results: 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.

Conclusion: There is no association between alpha angle ≥ 55 degrees and presence of herniation pit or demographic variables.

No MeSH data available.


Related in: MedlinePlus

Presence of herniation pit was determined on MRI.It was shown as focal fibrocystic lesion with low signal intensity (arrow) on T1-weighted image (A) and intermediate to high signal intensity (arrow) on T2-weighted image (B) in location of femur head and neck junction.
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Figure 2: Presence of herniation pit was determined on MRI.It was shown as focal fibrocystic lesion with low signal intensity (arrow) on T1-weighted image (A) and intermediate to high signal intensity (arrow) on T2-weighted image (B) in location of femur head and neck junction.

Mentions: Presence of herniation pit was subjectively assessed and size of herniation pit was measured on axial, coronal and oblique axial MR images only by first observer, using the typical radiologic finding of focal fibrocystic lesion in femoral head and neck of > 2 mm in diameter with low signal intensity (SI) on T1-weighted image and intermediate to high SI on T2-weighted image (Fig. 2). The size of herniation pit was defined as the longest diameter between measured value from axial, coronal and oblique axial images. Herniation pits were divided into 2 groups; herniation pits larger than mean value (> 5.2 mm) and smaller than mean value (< 5.2 mm). Before assessment, the first observer underwent a consensus training session with a musculoskeletal staff radiologist (12 years of experience) for proper diagnosis of herniation pit. The radiologist was blinded to the alpha angles when evaluating herniation pit. Ten ambiguous cases from first observer were rechecked by being assessed under consensus with the musculoskeletal staff radiologist (12 years of experience).


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

Lee E, Choi JA - Korean J Radiol (2015)

Presence of herniation pit was determined on MRI.It was shown as focal fibrocystic lesion with low signal intensity (arrow) on T1-weighted image (A) and intermediate to high signal intensity (arrow) on T2-weighted image (B) in location of femur head and neck junction.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4644754&req=5

Figure 2: Presence of herniation pit was determined on MRI.It was shown as focal fibrocystic lesion with low signal intensity (arrow) on T1-weighted image (A) and intermediate to high signal intensity (arrow) on T2-weighted image (B) in location of femur head and neck junction.
Mentions: Presence of herniation pit was subjectively assessed and size of herniation pit was measured on axial, coronal and oblique axial MR images only by first observer, using the typical radiologic finding of focal fibrocystic lesion in femoral head and neck of > 2 mm in diameter with low signal intensity (SI) on T1-weighted image and intermediate to high SI on T2-weighted image (Fig. 2). The size of herniation pit was defined as the longest diameter between measured value from axial, coronal and oblique axial images. Herniation pits were divided into 2 groups; herniation pits larger than mean value (> 5.2 mm) and smaller than mean value (< 5.2 mm). Before assessment, the first observer underwent a consensus training session with a musculoskeletal staff radiologist (12 years of experience) for proper diagnosis of herniation pit. The radiologist was blinded to the alpha angles when evaluating herniation pit. Ten ambiguous cases from first observer were rechecked by being assessed under consensus with the musculoskeletal staff radiologist (12 years of experience).

Bottom Line: 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.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.

View Article: PubMed Central - PubMed

Affiliation: Department of Radiology, Seoul National University Bundang Hospital, Seongnam 13620, Korea.

ABSTRACT

Objective: To evaluate the association between alpha angle and herniation pit on MRI in asymptomatic hip joints and their associations with demographic variables.

Materials and methods: 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.

Results: 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.

Conclusion: There is no association between alpha angle ≥ 55 degrees and presence of herniation pit or demographic variables.

No MeSH data available.


Related in: MedlinePlus