Wolfe's Classification of Trigger Finger
| Grade | Type | Description |
| I | Pre-triggering | Pain in the palm; possible history of catching, but not seen on examination; tenderness over A1 pulley |
| II | Active | Patient demonstrates catching but can actively extend the finger |
| III | Passive | Patient demonstrates locking that requires passive extension (IIIa); may be unable to flex the finger (IIIb) |
| IV | Contracture | A locked trigger finger with a fixed flexion contracture of the proximal interphalangeal joint |
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