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Thumb classification according to the Blauth classification.
| Classification Type | Brief Description | Number | Prevalence |
|---|---|---|---|
| I | Small thumb with hypoplastic intrinsic muscles | 4 | 5% |
| II | Small thumb with narrowed first web, hypoplastic intrinsic muscles, and laxity of the MP joint ulnar collateral ligament | 10 | 15% |
| III | Small thumb with narrowed first web, hypoplastic intrinsic and extrinsic muscles, MP joint instability | 14 | 18% |
| IV | Floating thumb, pouce flottant | 13 | 16% |
| V | Absent thumb | 38 | 48% |
