| I Type (Anterior or Extension Type) |
Ulnar fracture at any level, angulated towards the palmar side, combined with anterior dislocation of the radial head. This occurs when falling with the elbow extended and forearm in a supinated position. |
| II Type (Posterior or Flexion Type) |
Ulnar shaft fracture, angulated towards the dorsal side, combined with posterior dislocation of the radial head. This occurs when falling with the elbow in a slightly flexed position and the forearm in a pronated position. |
| III Type (Lateral or Adduction Type) |
Proximal ulnar diaphyseal fracture, with lateral or anterior dislocation of the radial head, seen only in children. This occurs when falling with the elbow extended and forearm in a pronated position. Due to vertical forces transmitted to the elbow, lateral force is applied to the medial side, causing a fracture of the ulnar olecranon with angulation towards the radial side, while also causing dislocation of the radial head. This type of ulnar fracture often shows longitudinal splitting, buckling, or transverse splitting, with less obvious displacement, making it easy to miss.
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| IV Type (Special Type) |
Anterior dislocation of the radial head, fracture of the proximal 1/3 of the radius, and any level of ulnar fracture. |
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