Rare diseases · Sign or symptom
Metacarpophalangeal synostosis
Fused long bone of hand with innermost finger bone
HP:0005880
What it means
Fusion of a metacarpal bone with the proximal phalanx of the finger distal to it across the corresponding metacarpophalangeal joint.
Rare diseases that can present with this1
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
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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.