You can see in the following illustration comparing a foot without a bunion to one with a bunion, that the 1st metatarsal is mal-positioned from the base (bottom) of the bone. The 1st metatarsal is not crooked, bowed, or deformed – its straight and just mal-aligned from the base (bottom).
While visual appearance of a bunion occurs at the big toe joint, its this midfoot joint that is thought (by some) to cause the bunion. Also, some believe that this joint (1st metatarsocuneiform joint) is malstructured or too mobile causing the bunion in the first place.
Bunions are thought to occur for several reasons. In most situations, a bunion is caused by a combination of factors leading the deformity.
- Family history
- Evolutionary influence
- Females are more likely to develop bunions
- Men may develop bunions too
- Flatfeet or fallen arches
- Unequal Limb lengths
- Morton’s foot
A type of foot where the 1st metatarsal is shorter than the others
- Loose ligaments in the foot
May be associated with a genetic condition
May occur with prenancy
- Bone structure deformities
Malshaped big toe joint
Congenital absence of certain foot bones – particulary the tibial sesamoid
Tight calf muscle and achilles tendon
This often occurs from long-term high heel shoes
Improper Shoe gear
- Small shoes
- Pointy shoes
- Shoes with a tight toe box
- High heels
- Acute injury
- Chronic injury
Disclaimer: All information on SurgeryBunion.com is informational. It does not constitute medical advice. For medical advice consult a licensed physician.