Superior-inferior stability of the shoulder: Role of the coracohumeral ligament and the rotator interval capsule

Eiji Itoi, Lawrence J. Berglund, John J. Grabowski, Leslie Naggar, Bernard F. Morrey, A. N. Kai-Nan

研究成果: Article査読

76 被引用数 (Scopus)

抄録

Objective: To study the superior-inferior stabilizing functions of the coracohumeral ligament (CHL) and the rotator interval capsule (RIC) with use of a material testing machine. Material and Methods: The axial translations of the humerus with the superior-inferior translation force of 30 N applied were recorded under the following joint capsule conditions: (1) intact, (2) vented, (3) the CHL sectioned, and (4) the RIC incised in six cadaver shoulders. The order of sectioning was changed for conditions 3 and 4 in six other cadaver shoulders. Results: With the arm in internal and neutral rotations, venting the capsule significantly increased the superior-inferior translation, which was unaffected by further sectioning of the CHL and the RIC. With the arm in external rotation, only the CHL contributed significantly to inferior stability, whereas both this ligament and the RIC contributed to superior stability to a lesser degree. Conclusion: The CHL is a stabilizer in superior-inferior directions with the arm in external rotation, and the intra-articular pressure that is maintained by the intact RIC is a stabilizer in superior-inferior directions with the arm in internal and neutral rotations. These findings may provide a scientific background to support closure of the interval space to stabilize the shoulder and may explain part of the superior instability observed in shoulders with rotator cuff tears.

本文言語English
ページ(範囲)508-515
ページ数8
ジャーナルMayo Clinic Proceedings
73
6
DOI
出版ステータスPublished - 1998
外部発表はい

ASJC Scopus subject areas

  • 医学(全般)

フィンガープリント

「Superior-inferior stability of the shoulder: Role of the coracohumeral ligament and the rotator interval capsule」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

引用スタイル