Nimura, J Shoulder Elbow Surg 2012 - The Superior Capsule of the Shoulder Joint Complements the Insertion of the Rotator Cuff

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The Superior Capsule of the Shoulder Joint Complements the Insertion of the Rotator Cuff

Nimura, Akita, et al.·J Shoulder Elbow Surg·2012·190 citations·Anatomic study

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Background

To date, there are no studies about the attachment of the articular capsule of the superior shoulder joint. The aim of this study was to measure the width of the attachment of the articular capsule on the humerus, and to clarify the anatomy and the relationship to the footprint of the rotator cuff.

Methods

The attachment of the articular capsule on the greater tuberosity was exposed. The width of the attachment of the capsule and the footprint of the rotator cuff were measured.

Results

The maximum capsular width was located at the border between the infraspinatus and the teres minor, and measured 9.1 mm.
The minimum capsular width was 3.5 mm, and it was located at 10.9 mm posterior to the anterior margin of the greater tuberosity and 1.5 mm anterior to the posterior margin of the supraspinatus.

Conclusions

Prior studies have overestimated the rotator cuff footprint width due to the lack of discrimination between the actual cuff insertion and capsule. The attachment of the articular capsule of the shoulder joint occupied a substantial area of the greater tuberosity. In particular, at the border between the infraspinatus and the teres minor, the very thick attachment of the articular capsule compensated for the lack of attachment of muscular components. The thinnest point of the articular capsule was 11 mm posterior to the anterior margin of the greater tuberosity and very close to the posterior edge of the tapered insertion of the supraspinatus, which could contribute to the etiology of degenerative rotator cuff tears.

Copyright remains with the authors and publisher.

The Superior Capsule of the Shoulder Joint Complements the Insertion of the Rotator Cuff.

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The Superior Capsule of the Shoulder Joint Complements the Insertion of the Rotator Cuff

Nimura, Akita, et al.·J Shoulder Elbow Surg·2012·190 citations·Anatomic study

|

Background

To date, there are no studies about the attachment of the articular capsule of the superior shoulder joint. The aim of this study was to measure the width of the attachment of the articular capsule on the humerus, and to clarify the anatomy and the relationship to the footprint of the rotator cuff.

Methods

The attachment of the articular capsule on the greater tuberosity was exposed. The width of the attachment of the capsule and the footprint of the rotator cuff were measured.

Results

The maximum capsular width was located at the border between the infraspinatus and the teres minor, and measured 9.1 mm.
The minimum capsular width was 3.5 mm, and it was located at 10.9 mm posterior to the anterior margin of the greater tuberosity and 1.5 mm anterior to the posterior margin of the supraspinatus.

Conclusions

Prior studies have overestimated the rotator cuff footprint width due to the lack of discrimination between the actual cuff insertion and capsule. The attachment of the articular capsule of the shoulder joint occupied a substantial area of the greater tuberosity. In particular, at the border between the infraspinatus and the teres minor, the very thick attachment of the articular capsule compensated for the lack of attachment of muscular components. The thinnest point of the articular capsule was 11 mm posterior to the anterior margin of the greater tuberosity and very close to the posterior edge of the tapered insertion of the supraspinatus, which could contribute to the etiology of degenerative rotator cuff tears.

Copyright remains with the authors and publisher.

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