| Type I: Fracture between ligaments, stable, no surgery needed; the proximal fragment remains connected to the coracoclavicular ligaments, and the fracture is not displaced. This includes fractures through the acromioclavicular joint surface. |
| Type II: Fracture with loss of continuity between the coracoclavicular ligaments and the proximal fragment, often requiring surgery; the proximal fragment is disconnected from the coracoclavicular ligaments, and the fracture is significantly displaced. Although Type II fractures account for only about 1/4 of lateral end fractures, they have a high nonunion rate. |
| Type III: Fracture involving the acromioclavicular joint, potentially leading to traumatic arthritis, requiring secondary resection of the distal clavicle to relieve pain. |
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