Rare diseases · Sign or symptom
Hypoplasia of the ulna
Underdeveloped inner large forearm bone
HP:0003022
What it means
Underdevelopment of the ulna.
Rare diseases that can present with this27
Very common80–99%
11- Acro-renal-mandibular syndrome
- Fibulo-ulnar hypoplasia-renal anomalies syndrome
- Léri-Weill dyschondrosteosis
- Lethal faciocardiomelic dysplasia
- Mesomelic dwarfism, Reinhardt-Pfeiffer type
- Mietens syndrome
- Postaxial acrofacial dysostosis
- Ulna hypoplasia-intellectual disability syndrome
- Ulnar hypoplasia-split foot syndrome
- Upper limb mesomelic dysplasia, type Fryns
- W syndrome
Common30–79%
11- 3M syndrome
- Acrodysostosis
- Acro-renal-ocular syndrome
- Atrioventricular defect-blepharophimosis-radial and anal defect syndrome
- Cenani-Lenz syndrome
- Distal duplication 5q syndrome
- Holoprosencephaly-radial heart renal anomalies syndrome
- Metaphyseal dysplasia, Braun-Tinschert type
- Segmental venous malformation
- Short ulna-dysmorphism-hypotonia-intellectual disability syndrome
- Spondyloperipheral dysplasia-short ulna syndrome
The range is how often this sign appears among people diagnosed with each disease — it is not a probability of having any of them. Many of these signs also occur in common, non-rare conditions. A sign on this page is a conversation to have with a clinician, not a conclusion.
Part of the broader category
Also called: Hypoplastic ulna · Short ulna · Short ulnae · Ulnar hypoplasia · Underdeveloped ulna
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Start free with EleplanThis page uses the Human Phenotype Ontology (2026-06-23) — Human Phenotype Ontology Consortium, hpo.jax.org. Disease associations from Orphanet (INSERM), CC BY 4.0. Content is educational and is not medical advice.