This may be because the tunnel direction becomes diagonal rather than vertical relative to the outer coracoid process anatomically when clavicle tunnels are placed near the conoid process, which leads to ineffective scapuloclavicular
 classified coracoid fractures into two types from a functional point of view according to the relationship between the fracture site and the CCL; type I fractures occurring proximal to this ligament attachment destroy the scapuloclavicular
connection, whereas type II fractures distal to this attachment basically preserve this connection.
However, the coracoclavicular ligaments allow the scapula to rotate downward as the clavicle rotates upward, a phenomenon referred to as synchronous scapuloclavicular
motion, with only 5[degrees] to 8[degrees] of motion occurring at the AC joint.