The Coracoclavicular Joint and Related Pathological Conditions.

According to the theory of the development of the shouldergirdle of Gegenbaur (1898), the embryonic coracoid is connected with the clavicle by the cartilaginous procoracoid. In the course of normal development, this bone becomes fibrous and is ultimately transformed into the coracoclavicular ligaments. On their surface, in normal adults, nests of chondrocytes and even small nodules of cartilage are frequently seen. Whereas Gegenbaur's theory has been accepted by some (including Huntington, 1918; Ravelli, 1955), it has been opposed by others (Hanson, 1920; Hommes, 1921). However, whatever its value from the morphogenetic point of view, this theory can provide a suitable basis for the