The muscles and nerves in the hand may be missing or unbalanced.

In severe cases, ulnar digits (e.g. ring and pinky finger) may be missing.

[3][4][5][6] Sometimes, other orthopedic problems occur alongside this malformation, such as scoliosis.

The ulnae is slightly shorter than average and there is a barely noticeable wrist deviation Type 2: The ulnae is moderately-severely smaller than normal.

The radius is deviated and so is the hand Type 3: The ulnae is completely missing.