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Long biceps tendon: normal position, shape, and orientation in its groove in neutral position and external and internal rotation


Buck, F M; Dietrich, T J; Resnick, D; Jost, B; Pfirrmann, C W A (2011). Long biceps tendon: normal position, shape, and orientation in its groove in neutral position and external and internal rotation. Radiology, 261(3):872-881.

Abstract

PURPOSE:

To characterize the position, shape, and orientation of the long biceps tendon (LBT) on transverse magnetic resonance (MR) images acquired in neutral position and in maximal external and internal rotation of the shoulder in asymptomatic volunteers.
MATERIALS AND METHODS:

Informed consent was obtained from all volunteers for this institutional review board-approved study. Fifty-three asymptomatic volunteers (mean age, 33 years; age range, 21-58 years) were included. The position of the LBT with respect to the bicipital groove was measured by two musculoskeletal radiologists on three levels along the bicipital groove on axial MR images in neutral position and in external and internal rotation of the shoulder. The shape of the LBT was classified as round, oval, flat, or comma shaped, and the orientation of the LBT was measured.
RESULTS:

The position of the LBT changed significantly at the entrance into the bicipital groove in the mediolateral and anteroposterior directions (P < .01). The changes of LBT position in external rotation and internal rotation compared with the neutral position were markedly small (< 1.5 mm). Medial eccentricity of the LBT was greatest in the neutral shoulder position at all measurement levels. Differences in LBT shape and orientation were found between the neutral position and external or internal rotation and between the three measurement levels.
CONCLUSION:

The position of the LBT is only slightly dependent on shoulder rotation. LBT eccentricity is maximal in the neutral position. Rotational misplacement during image acquisition does not increase LBT eccentricity.

© RSNA, 2011.

Abstract

PURPOSE:

To characterize the position, shape, and orientation of the long biceps tendon (LBT) on transverse magnetic resonance (MR) images acquired in neutral position and in maximal external and internal rotation of the shoulder in asymptomatic volunteers.
MATERIALS AND METHODS:

Informed consent was obtained from all volunteers for this institutional review board-approved study. Fifty-three asymptomatic volunteers (mean age, 33 years; age range, 21-58 years) were included. The position of the LBT with respect to the bicipital groove was measured by two musculoskeletal radiologists on three levels along the bicipital groove on axial MR images in neutral position and in external and internal rotation of the shoulder. The shape of the LBT was classified as round, oval, flat, or comma shaped, and the orientation of the LBT was measured.
RESULTS:

The position of the LBT changed significantly at the entrance into the bicipital groove in the mediolateral and anteroposterior directions (P < .01). The changes of LBT position in external rotation and internal rotation compared with the neutral position were markedly small (< 1.5 mm). Medial eccentricity of the LBT was greatest in the neutral shoulder position at all measurement levels. Differences in LBT shape and orientation were found between the neutral position and external or internal rotation and between the three measurement levels.
CONCLUSION:

The position of the LBT is only slightly dependent on shoulder rotation. LBT eccentricity is maximal in the neutral position. Rotational misplacement during image acquisition does not increase LBT eccentricity.

© RSNA, 2011.

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5 citations in Web of Science®
6 citations in Scopus®
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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:04 Faculty of Medicine > Balgrist University Hospital, Swiss Spinal Cord Injury Center
Dewey Decimal Classification:610 Medicine & health
Language:English
Date:December 2011
Deposited On:02 Feb 2012 20:35
Last Modified:05 Apr 2016 15:32
Publisher:Radiological Society of North America
ISSN:0033-8419 (P) 1527-1315 (E)
Free access at:Publisher DOI. An embargo period may apply.
Publisher DOI:https://doi.org/10.1148/radiol.11110914
PubMed ID:21969668

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