University of Twente Student Theses

The Contributions of Muscle Activity in Acromiohumeral Distance Change During a Modified Sulcus Sign Test

Fuchs, S.W.A. and Gianotten, M.L.N. and Haan, A.J. and Smit, M.M. (2025) The Contributions of Muscle Activity in Acromiohumeral Distance Change During a Modified Sulcus Sign Test.

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Abstract:	The sulcus sign test is a commonly used test to assess the inferior static stabilisers in the glenohumeral joint and to diagnose inferior glenohumeral instability. In an earlier study on a quantitative method to measure glenohumeral translation using ultrasound, some participants showed an upward rather than the expected downward humeral translation relative to the acromion. The objective of this research is to gain more insight into the contribution of the presence or absence of the muscle activity of the supraspinatus, posterior deltoideus and lateral deltoideus to the change in acromiohumeral distance during a modified sulcus sign test in individuals with healthy shoulders. Moreover, this research explores the impact of other variations of a modified sulcus sign test on this muscle activity and acromiohumeral distance. No significant results were found in this study. The lateral deltoideus appears to have a contribution to the occurrence of an upward translation of the humerus relative to the acromion in the instant unilateral variation of the modified sulcus sign test. Loading gradually shows most opportunity in limiting the contribution of the lateral deltoideus.
Item Type:	Essay (Bachelor)
Faculty:	TNW: Science and Technology
Subject:	44 medicine
Programme:	Technical Medicine BSc (50033)
Link to this item:	https://purl.utwente.nl/essays/105030
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