| Type I: Minimally displaced fractures of the radial head or neck |
① Limited forearm rotation (pronation/supination) due to pain or swelling. |
| ② Intra-articular fracture fragments displaced less than 2mm. |
| Type II: Displaced fractures of the radial head or neck (displacement greater than 2mm) |
① Limited movement due to mechanical blockage or poor joint congruence. |
| ② Fracture is not severely comminuted and can be treated with open reduction and internal fixation. |
| ③ Fracture involves more than the edge of the radial head. |
| Type III: Severely comminuted fractures of the radial head or neck |
① Reconstruction of the radial head is not possible. |
| ② Radial head excision is required to restore elbow or forearm range of motion. |
| Type IV: Comminuted fractures of the radial head with elbow dislocation. |
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