A bunion is a deformity of the metatarsophalangeal (MTP) joint at the base of the big toe. A bunion develops when the first metatarsal bone of the foot turns outward and the big toe points inward (toward the other toes), causing the joint to jut out. A bunion is most likely to develop when susceptible feet are repeatedly squeezed into narrow, pointed-toe footwear. The big toe pushes against the other toes, sometimes diving over or under them. As a result, the base of the big toe ? the metatarsophalangeal (MTP) joint ? juts or angles out from the foot.
No one single cause has been proven. There are a number of causes, and though shoes can exacerbate the problem, bunions do occur in societies that don?t wear them. We walk on the same type of ground all the time, whereas the human foot was actually designed to adapt to varying terrains. In a sense, a bunion is a type of repetitive strain injury. And like repetitive strain injury, some people are more prone to it than others. One theory, though it remains unproven, is that bunions are caused by one or both of the following. Because the foot wasn?t designed to constantly walk on a level surface, the ball of the big toe is slightly lower than the ball of the rest of your foot. When your foot meets the ground, the ball of the big toe is pushed up, and the big toe joint can?t bend as well as it was designed to. In order for the big toe joint to bend fully as you walk, your foot rolls slightly over to the side (this is also why people with hallux valgus often get hard skin). Also, if your midtarsal joint tends to move from side to side more than it does up and down, the arch in your foot collapses as your foot rolls in. This also makes you more prone to developing bunions. Such problems can be exacerbated by tight footwear. Slip-on shoes can make matters worse. Because they have to be tighter to stay on your feet, you automatically have less room for your toes. And with nothing to hold your foot in place, your toes often slide to the end where they?re exposed to lots of pressure. Likewise, high heels throw more weight onto the ball of the foot, putting your toes under further pressure. If you haven?t got a bunion by adulthood and you later develop one, there could be some underlying arthritis.
Redness, swelling, or pain along the inside margin of the foot just behind the great toe. Moderate to severe discomfort at the bunion when wearing shoes, particularly if tight fitting. A painful callus may develop over the bunion. Sometimes a painful corn on the adjacent sides of the first and second toes. Irritation if there is overlapping of the first and second toes. Arthritis may cause stiffness and discomfort in the joint between the great toe and the first metatarsal. There may be a fluid filled cyst or bursa between the skin and the "bunion bone". Skin over the bunion may break down causing an ulceration, which can become infected.
Orthopaedic surgeons diagnose bunions on the basis of physical examination and weight bearing x-rays. Two angles are assessed, the intermetatarsal angle, that is between the first and second metatarsals (the bones that lead up to the base of the toes). If this angle exceeds 9? (the angle found in the healthy foot) it is abnormal and referred to as metatarsus primus varus. the hallux valgus angle, that is, the angle of the big toe as it drifts toward the small toe. An angle that exceeds 15? is considered to be a sign of pathology.
Non Surgical Treatment
Getting rid of a Bunion is almost impossible without surgery. Foot and toe exercises can help. Foam pads can reduce the pressure on the joint. Ice packs and anti-inflammatory medication can help reduce swelling. The progress of a Bunion can be slowed or even halted, especially if it is caused by ill-fitting footwear. Of course the best course of action is to not wear pointy-toed high-heel shoes to begin with. But if you have worn improper footwear and now want to stop the progress of Bunions.
Surgery might be recommended if non-surgical treatments fail to provide relief, and you are having trouble walking or are in extreme pain. Surgery can be used to return the big toe to its correct anatomical position. During surgery, bones, ligaments, tendons, and nerves are put back into correct order, and the bump is removed. Many bunion correction procedures can be done on a same-day basis. The type of procedure will depend on your physical health, the extent of the foot deformity, your age, and your activity level. The recovery time will depend on which procedure or procedures are performed. Surgery may be recommended to correct a tailor?s bunion, but is unlikely to be recommended for an adolescent bunion.
To help prevent bunions, select your style and size of shoes wisely. Choose shoes with a wide toe area and a half-inch of space between the tip of your longest toe and the end of the shoe. Shoes also should conform to the shape of your feet without causing too much pressure.