0001440 Metatarsal synostosis	0010073 Synostosis involving the 1st metatarsal	0010091 Symphalangism affecting the proximal phalanx of the hallux	0010209 Symphalangism affecting the proximal phalanges of the toes	0100237 Proximal foot symphalangism
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0100488 Synostosis of the proximal phalanx of the hallux with the 1st metatarsal

synonym

Fusion of the innermost big toe bone with the 1st long bone of foot