Hallux valgus, also known as a bunion, is one of the most common deformities of the foot. The big toe drifts towards the smaller toes, while the first metatarsal bone moves towards the inside of the foot. As a result, the big toe joint sticks out on the inner edge of the foot – the bunion, which presses and hurts in the shoe. Women are affected more often, and a hereditary tendency often plays a part; tight shoes with high heels and a splayfoot can make the deformity worse.
Over time, the whole forefoot can change: the neighbouring toes are crowded and bend into hammer or claw toes, and painful calluses develop under the heads of the metatarsal bones. If the cartilage in the big toe joint wears away, the toe becomes stiff. This condition, hallux rigidus, can also occur without the toe being crooked.
Treatment starts without surgery: shoes with soft uppers and enough room, insoles, padding, splints, tape and physiotherapy. These can ease pain but hardly straighten the toe again. If the symptoms persist after about three months, restrict walking, or hardly any shoe fits any more, surgery becomes an option. The deciding factor is the symptoms, not the appearance.
In the operation, the first metatarsal bone is usually cut through, shifted and fixed with screws or a plate – a realignment, or osteotomy, sometimes performed through very small incisions. Procedures on the tendons and joint capsule hold the toe in its new position. With a severe deformity, an unstable joint in the midfoot or osteoarthritis, a fusion can be the better choice. None of the common techniques is clearly superior to the others.