| Digit |
PIP E/F |
DIP E/F |
||
| Active | Passive | Active | Passive with PIP extended | |
| Index | ||||
| Middle | ||||
| Ring | ||||
| Small | ||||
|
BOUTONNIERE CLASSIFICATION |
|
| I | Mild extension lag, passively correctable |
| II | Moderate extension lag, passively correctable |
| III | Mild flexion contracture |
| IV | Advanced flexion contracture |