An abnormal shape or form of the proximal phalanx of the big toe.
Comment:
In contrast to the proximal phalanges of the digits 2-5, the proximal phalanx of the big toe is embryologically equivalent to the middle phalanges of the other digits, whereas the first metatarsal is embryologically of phalangeal origin and as such equivalent to the proximal phalanges of the other digits.
Synonyms:
exact_synonym:
Abnormal innermost big toe bone; Abnormality of the proximal phalanx of the hallux