Final answer:
The primary function of the acromioclavicular (AC) joint is to provide a wide range of motion to the shoulder, supported by the strong coracoclavicular ligament which prevents disruption during force transmission from the upper limb.
Step-by-step explanation:
The acromioclavicular (AC) joint is an important articulation in the body located between the clavicle (collarbone) and the scapula (shoulder blade), precisely at the acromion of the scapula. Its primary function is to provide a wide range of motion to the shoulder. The AC joint is supported by the coracoclavicular ligament, which is a strong band of connective tissue that anchors the coracoid process of the scapula to the acromial end of the clavicle. This ligament provides crucial indirect support for the AC joint. When the ligaments around the AC joint, which are relatively weak, are compromised, such as in a hard fall or impact, it can result in a 'shoulder separation' injury. Despite this, the ligament's strength is critical for transmitting forces from the upper limb to the clavicle without displacing the scapula laterally.
The primary function of the Acromioclavicular (AC) joint between the scapula and clavicle is to connect the scapula and clavicle. This joint allows for limited movement and transmits forces from the upper limb to the clavicle. While the ligaments around the AC joint are relatively weak, the primary support for the joint comes from the coracoclavicular ligament, which anchors the coracoid process of the scapula to the inferior surface of the acromial end of the clavicle.