RESUMEN
Although the triangular deltoid muscle has three distinct portions originating from the scapula and acromion, the underlying coraco-acromial ligament presents as the stabilizing factor for the anterior deltoid, thus bridging the interval within the coraco-acromial arch. As the deltoid muscle integrity is vulnerable during the resection of the coraco-acromial ligament from the acromion, the purpose of this study was to quantify the height of the deltoid muscle over the region of the coraco-acromial ligament. The superior shoulder region in seventeen nor-mal female individuals (n = 34) were bilaterally examined through an ultrasonographic system (Medelec Synergy: Acertys T2 EDX, 2012). In addition to the length of the coraco-acromial ligament, the height of the deltoid muscle was measured at three selected areas between the posterior aspect of the coracoid process and the anterior acromial tip, just superior to the coraco-acromial ligament. The mean coraco-acromial length was found to be 24.8±7.6mm. The mean deltoid height at regions 1, 2 and 3 were 8.4 ± 2.7 mm, 9.1 ± 2.1 mm and 8.4 ± 3.0 mm, respectively. The height of the deltoid muscle was recorded to be constant across all three regions related to the coraco-acromial ligament. Moreover, the specific height of the deltoid muscle in the region of the coraco-acromial ligament was not reported in the literature reviewed. In addition, this study was done to complement the introduction of the delto-fulcral triangle model by Naidoo et al. (2017). The provision of data regarding the specific deltoid height may assist to preserve the deltoid muscle and the accompanying coraco-acromial ligament during operative procedures
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