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| Classification | Type of Fracture Displacement (Jakob) or Line (Milch) |
| Jakob | |
| Type I | Little or no displacement |
| Type II | Moderate lateral translation with or without fragment tilt |
| Type III | Major fragment tilt or rotation on the axis of the humerus |
| Milch | |
| Type I | Fracture line lateral to the trochlear groove |
| Type II | Fracture line extending into the trochleargroove |
