Another muscle that helps to stabilize the shoulder is the long head of the biceps brachii. The biceps brachii is the opposing muscle to the triceps. The long head of the biceps is involved in shoulder stability due to its point of origin being located in the shoulder at the supraglenoid tubercle. The long head of the triceps prevents the humerus from moving too far posteriorly with the force produced by different muscles such as the posterior deltoid and infraspinatus. Meanwhile, the biceps contribute to the anterior stability of the humerus along with muscles such as pectoralis major and subscapularis.
Taking a deeper look into shoulder stability illuminates our understanding that tissue damage is not just localized to where a patient may feel pain. An issue may arise in one location but cause inhibition somewhere else triggering a compensative injury to transpire. Furthermore, understanding the role these overlooked muscles play in shoulder stability helps us to identify dysfunction in these areas and rehabilitate them effectively.
More to come on how to treat problems with the long head triceps and biceps!
Written by Matt O’Brien (Personal Trainer and Bachelor of Kinesiology Student).
Edited by Sarah Tringale (Traditional Chinese Medicine Practitioner Candidate).