Final answer:
The acromioclavicular joint's capsular pattern typically involves pain and reduced range of motion during arm abduction and elevation. Its stability is primarily provided by the coracoclavicular ligament, which connects the coracoid process of the scapula to the clavicle.
Step-by-step explanation:
The capsular pattern of the acromioclavicular joint is not typically described in classic literature, as capsular patterns are more commonly associated with synovial joints like the shoulder (glenohumeral joint), hip, or knee. However, when referring to the pattern of motion loss in a joint due to capsular tightness, the acromioclavicular joint often exhibits pain and a reduction in the range of motion, with arm abduction and full elevation being notably affected.
The acromioclavicular joint is an important articulation between the acromion of the scapula and the acromial end of the clavicle. It plays a crucial role in transmitting forces from the upper limb to the clavicle. The stability of this joint is provided by the coracoclavicular ligament, a strong band of connective tissue that anchors the coracoid process of the scapula to the lateral clavicle, providing important indirect support. A shoulder separation often occurs due to a blow to the lateral shoulder, leading to dislocation and a rupture of the supporting ligaments.