What does the abbreviation 'A-C' refer to in a shoulder context?

The abbreviation 'A-C' in a shoulder context specifically refers to the acromio-clavicular joint. This joint is an important anatomical structure that connects the acromion (the highest point of the shoulder blade) to the clavicle (collarbone). Understanding this joint is essential for orthotic fitters because it plays a critical role in shoulder mechanics and mobility. Dysfunction or injury to the A-C joint can lead to various shoulder issues, making it vital for professionals in this field to recognize and understand its anatomy, function, and potential pathologies. This knowledge is integral to effectively assess and create orthotic devices that support or rehabilitate patients experiencing shoulder-related complications.