However, when these infraspinatus tears are combined with large superior cuff defects and loss of teres minor
function, they result in significant dysfunction.
Repair of the subscapularis with rTSA significantly increased the force required by the posterior deltoid, total deltoid, infraspinatus, teres minor
, total posterior cuff, and pectoralis major muscles and also significantly increased the meanjoint reaction force during scapular abduction with the elbow flexed to 90[degrees] relative to when the subscapularis was not repaired (Table 1).
In association with the posterior humeral circumflex artery the nerve passes back through the quadrilateral space, a small opening formed by teres minor
above, teres major below, long head of biceps medially and the proximal humerus laterally (6,7).
It is strongly recommended that archers incorporate exercises specifically designed to strengthen the supra-spinatus, infraspinatus and teres minor
2) The teres minor
muscle, elongated in morphology, arises from the middle portion of the lateral scapular border and dense fascia of the infraspinatus to insert on the inferior facet of the greater tuberosity.
If an entry point inferior to the teres minor
muscle (through the quadrangular space) is used, other potential risks are contact with the axillary nerve and the posterior humeral circumflex artery.
The infraspinatus and teres minor
muscles are external rotators of the shoulder.
4% Posterior Wear Infraspinatus Teres Major Teres Minor
38 mm Standard, No Wear -1.
The four rotator cuff muscles (two of them--the infraspinatus and teres minor
, are shown) play key roles in much of this arm movement.
Eight muscles were simulated as three lines from its origin on the scapula or clavicle to its insertion on the humerus: anterior deltoid (yellow), middle deltoid (dark green), posterior deltoid (magenta), subscapularis (light green), infraspinatus (dark blue), teres major (red), teres minor
(cyan), and the clavicular portion of the pectoralis major (orange) (Fig.
While muscle transfers have been demonstrated to successfully restore active external rotation, they should not be performed if the teres minor
It was hypothesized that for the Equinoxe rTSA prosthesis, this offset would not significantly alter the excursion and force demands on the infraspinatus and teres minor
compared to the non-offset prosthesis.