What is Bunion and Hallux Rigidis?

A bunion or hallux valgus is a prominence on the inner border of the foot effecting the big toe and at the level of the 1st metatarso-phalangeal (MTP) joint. The bunion prominence which is seen and felt on the inner border of the foot is not due to any growth of bone but is due to the 1st metatarsal bone. With a bunion this has become more prominent than normal because the 1st metatarsal has moved away from its immediate neighbour the 2nd metatarsal. This widens the forefoot thus producing the bunion.

A true bunion or hallux valgus results from a drifting inwards of the big toe metatarsal from its normal position closer to the second metatarsal. The bunion is the head of this first metatarsal which produces the prominence on the inner side of the now wider foot. Tendons run circumferentially around the metatarsal and toe. They both move and stabilise the toe under normal circumstances. In a bunion or hallux valgus, with the shift/displacement of the first metatarsal these tendons no longer lie in the correct axis and in fact act as a deforming force, contributing to the bunion condition.

What are the causes?

  • Poorly fitted shoes
  • Hereditary
  • Arthitis

What are the treatments?

The treatment for a bunion lies between non-operative (conservative) and operative treatment. Conservative treatment for a bunion means either wearing wider fitting shoes or shoes with softer leather or using some form of a spacer between the big toe and 2nd toe (or alternatively some form of splint to keep the great toe away from the 2nd toe). The spacers or splintage may apparently straighten the bunion but they make no difference to the width of the foot, and the splaying of the 1st and 2nd metatarsals which occur with a bunion deformity. Therefore this type of treatment will not improve the main pain in a bunion which occurs due to the width of the forefoot. An arch type support orthotic may be useful if a bunion is associated with a flatter foot. If you have a bunion this is however just one other thing to get into a shoe with an already wide foot.

 

Bunionectomy (and 1st Metatarsal Osteotomy)