| Grade I: Occult instability with partial SLIL injury, no abnormal changes on static and stress X-rays. |
| Grade II: Dynamic instability with partial SLIL injury and additional volar extrinsic ligament injury, normal static X-rays but abnormal stress X-rays. |
| Grade III: Scapholunate dissociation due to complete SLIL injury with volar and dorsal extrinsic ligament injury, static X-rays show scapholunate gap ≥3 mm and scapholunate angle ≥70°. |
| Grade IV: Dorsal intercalated segment instability (DISI) with secondary injury to the radiolunate ligament, scaphotrapeziotrapezoid ligament, and dorsal intercarpal ligament, static X-rays show increased scapholunate gap and angle, radiolunate angle ≥15°, and capitolunate angle ≤-15°. |
| Grade V: Scapholunate advanced collapse (SLAC) secondary to scapholunate joint dysfunction, characterized by degenerative arthritis of the radial styloid, radiocarpal joint, capitolunate joint, and entire wrist joint. |
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