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Sub classification of Bell type A.
| A Sub type | Description |
|---|---|
| A1 | Broad hands, shortening of all digits. Middle phalanges and first phalanx are the most severely shortened. May be accompanied by symphalangism. |
| A2 | Shortening confined to middle phalanx of the index finger |
| A3 | Shortening confined to middle phalanx of the little finger |
| A4 | Middle phalanges of index and little finger are short, with radial clinodactyly of the ring finger |
| A5 | Absent middle phalanges |
