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The Journal of Bone and Joint Surgery, Vol 77, Issue 3 366-372, Copyright © 1995 by Journal of Bone and Joint Surgery, Inc
The role of the long head of the biceps brachii in superior stability of the glenohumeral joint
JJ Warner and PJ McMahon
Department of Orthopaedic Surgery, University of Pittsburgh, Pennsylvania 15213.
We studied seven patients who had isolated loss of the proximal attachment
of the tendon of the long head of the biceps brachii, documented
operatively or with magnetic resonance imaging, in order to identify and
measure superior translation of the humeral head on the glenoid. Four true
anteroposterior radiographs were made of both shoulders, before and after
the operation, with 0, 45, 90, and 120 degrees of humeral abduction in the
scapular plane. Four patients were managed with arthroscopic acromioplasty
with an open biceps tenodesis; one, with open biceps tenodesis alone; and
one, with debridement of a ruptured biceps stump; the remaining patient was
managed non-operatively. Two to six millimeters of superior translation of
the humeral head was noted in each patient in all positions of humeral
abduction except 0 degrees. This translation was significant compared with
the contralateral (control) shoulder. Kappa statistical analysis showed
excellent reproducibility and interobserver reliability of the technique of
radiographic measurement. The results of this study support the role of the
tendon of the long head of the biceps brachii as a stabilizer of the
humeral head in the glenoid during abduction of the shoulder in the
scapular plane.

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