Human Phenotype Ontology id HP_0001770 (Toe syndactyly) is webbing or fusion of the toes, involving soft parts only or including bone structure. Bony fusions are referred to as "bony" Syndactyly if the fusion occurs in a radio-ulnar axis. Fusions of bones of the toes in a proximo-distal axis are referred to as "Symphalangism". Also known as: Foot syndactyly, Fused toes, Syndactyly of feet, Syndactyly of toes, Webbed toes.