The hallux valgus angle (HAV) or hallux abductus angle is the angle formed between the
longitudinal axis of the first proximal phalanx and the longitudinal axis of the first
metatarsus.
In hallux varus or adductus the HAV is less then 5º. (Figure A) In normal subjects HAV is 5º to 15º
. Hallux abducto valgus is mild when HAV is 16º to 25º (Figure
B), moderate when HAV is 26º to 35º (Figure C) , and severe when HAV is greater than
35º (Figure D).
