Rare diseases · Sign or symptom
Finger symphalangism
Fused finger bones
HP:0009700
What it means
An abnormal union between bones or parts of bones of the fingers. The synonymous term "symphalangism of the hand" may be translated as fusions of bones of varying digree, that involve at least one phalangeal bone of the hand. If bony fusions are referred to as "Symphalangism" the fusion occurs in a proximo-distal axis. Fusions of bones of the fingers in a radio-ulnar axis are referred to as "bony" Syndactyly.
Rare diseases that can present with this27
Very common80–99%
8Common30–79%
10- Aphalangy-syndactyly-microcephaly syndrome
- Brachydactyly-syndactyly, Zhao type
- Brachydactyly type A4
- Brachydactyly type B2
- Ectrodactyly-polydactyly syndrome
- Microphthalmia-microtia-fetal akinesia syndrome
- Pfeiffer syndrome
- Poland syndrome
- Symphalangism with multiple anomalies of hands and feet
- Syndactyly type 2
Sometimes5–29%
7The 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: Symphalangism of the hand · Synostosis involving bones of the fingers
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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.