Coracoclavicular joints
Coracoclavicular joints The coracoclavicular joint (CCJ) is an anomalous anatomical variant rather than a true pathological condition. It represents an accessory or supernumerary joint between the coracoid process of the scapula and the clavicle , typically in the region where the coracoclavicular ligament (conoid and trapezoid parts) would normally be present. 1. Cause and Etiology The coracoclavicular joint is considered a developmental variant rather than a pathological lesion. It is thought to arise from: Ossification of the coracoclavicular ligament , particularly in regions where repetitive mechanical stress may stimulate osteogenesis. Congenital anomaly , representing a persistent phylogenetic remnant; in some primates and lower vertebrates, such a joint is physiologic. Proposed etiological factors include : Evolutionary remnants from quadrupeds. Mechanical stress or repetitive microtrauma occurs in individuals with heavy overhead arm ...