Stabilizing function of the long head of the biceps in the hanging arm position

Eiji Itoi, Neil E. Motzkin, Bernard F. Morrey, Kai Nan An

Research output: Contribution to journalArticle

42 Citations (Scopus)

Abstract

The contribution of the long head of the biceps (LHB) to shoulder stability was studied. Nine fresh-frozen cadaveric shoulders were tested in the hanging arm position. The muscle belly of the long head of the biceps was removed and replaced with a spring device to apply load to the long head of the biceps. An electromagnetic tracking device was used to record the positions of the humeral head (1) without load and with loads of 1.5 kg and 3 kg on the long head of the biceps, (2) with 1.5 kg of force to the proximal humerus in three different directions, and (3) in three different rotations of the arm. Displacement in the anterior and posterior directions was significantly decreased by long head of the biceps loading and was less significant in internal rotation. Inferior displacement in external rotation was significantly decreased by long head of the biceps loading. It is concluded that in the hanging arm position, the long head of the biceps could, if contracted, provide some stabilizing function to the humeral head in all directions, and more importantly, in anterior/posterior directions. Furthermore, the stabilizing function of the LHB is influenced by rotation of the arm.

Original languageEnglish (US)
Pages (from-to)135-142
Number of pages8
JournalJournal of Shoulder and Elbow Surgery
Volume3
Issue number3
DOIs
StatePublished - 1994

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Arm
Humeral Head
Bursitis
Equipment and Supplies
Electromagnetic Phenomena
Humerus
Muscles
Direction compound

ASJC Scopus subject areas

  • Surgery
  • Orthopedics and Sports Medicine

Cite this

Stabilizing function of the long head of the biceps in the hanging arm position. / Itoi, Eiji; Motzkin, Neil E.; Morrey, Bernard F.; An, Kai Nan.

In: Journal of Shoulder and Elbow Surgery, Vol. 3, No. 3, 1994, p. 135-142.

Research output: Contribution to journalArticle

Itoi, Eiji ; Motzkin, Neil E. ; Morrey, Bernard F. ; An, Kai Nan. / Stabilizing function of the long head of the biceps in the hanging arm position. In: Journal of Shoulder and Elbow Surgery. 1994 ; Vol. 3, No. 3. pp. 135-142.
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