Ulnar dysplasia
| Ulnar dysplasia | |
|---|---|
| Other names | Ulnar hypoplasia/aplasia, congenital ulnar deficiency |
| Ulnar hypoplasia | |
| Specialty | Medical genetics |
| Symptoms | Missing or underdeveloped ulnae bone |
| Complications | Grip, arm movement |
| Usual onset | Birth |
| Duration | Life-long |
| Causes | Genetic mutation, problem during embryonic life |
| Diagnostic method | Physical evaluation, X-ray |
| Frequency | very rare, occurs in about 1 in 100,000 live births |
Ulnar dysplasia also known as ulnar longitudinal deficiency, ulnar club hand or ulnar aplasia/hypoplasia is a rare congenital malformation which consists of an underdeveloped or missing ulnae bone, causing an ulnar deviation of the entire wrist. 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. Sometimes, radial dysplasia occurs alongside this malformation. This condition occurs in 1 in 100,000 live births. Sometimes, other orthopedic problems occur alongside this malformation, such as scoliosis.