Hallux varus is a deformity of the big toe joint where the hallux is deviated medially (towards the midline of the body) away from the first metatarsal bone. The hallux usually moves in the transverse plane.
The condition of Hallux varus deformity has various degrees of severity and causes. Hallux varus most commonly caused by rupture of the lateral collateral ligament at the MTP joint following a surgical procedure "as a previous bunion surgery" or trauma but it can also be due to removal of sesamoid bones, arthritis, or congenital deformity.
This Radiography of the left foot of a Stickler syndrome patient with an AP at age of 18 years foot radiograph showed progressive hallux varus and marked osteoarthritis in the base of the first toe.