Take a look at this classic example a bunion.
A bunion occurs because of the untoward action of the adductor hallucis. Normally, when the distal first ray is anchored, it contributes to the transverse and medial longitudinal arches of the foot as well as applying compressive forces across the articulations of the foot and providing stability and helping with supination. When the first ray is not anchored, the adductor pull the hallux laterally. This changes the axis of the first metatarsophalangeal joint moving it dorsally and posteriorly, limiting great toe dorsiflexion. It also applies an abductory force proximal phalanx, which, overtime, contributes to bunion.