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Thumb hypoplasia classification of Blauth as modified by Manske.
| Hypoplastic Thumb Classification |
|
|---|---|
| Type 1 | Slightly small thumb |
| Type 2 | Small thumb with Narrow first web space Unstable MCP joint Deficient thenar musculature |
| Type 3a | Type II with Extrinsic tendon abnormalities Metacarpal hypoplasia Stable CMC joint |
| Type 3b | Type II with Extrinsic tendon abnormalities Absent metacarpal base/ CMC instability |
| Type 4 | Floating thumb |
| Type 5 | Absent thumb |
