Knowing how bunions develop is helpful in selecting the appropriate bunion treatment. In general, most bunion deformities are a result of foot structure and function which are genetic. As the heel strikes the ground when walking, the joints of the foot unlock and absorb impact. Referred to as pronation, the arch collapses causing the feet to flatten. This flattening causes excessive tension of the tendon in the upper mid-foot that enables the big toe to bend upward. The tendon contracts which then forces the big toe to be pulled laterally toward the second toe. It can take many years for a bunion to develop, and especially to the point of pain. One can have a bunion but not yet experience any bunion pain. Conversely, one can suffer from bunion pain without having a severe deformity. Causes
Bunions form when the normal balance of forces exerted on the joints and tendons of your feet are disrupted. This can lead to instability in the big toe joint - also known as the first metatarsophalangeal (MTP) joint, causing a deformity. Bunions develop over years of abnormal motion and pressure on your big toe joint. They often result from a combination of your inherited foot type, faulty foot mechanics that affect the way you walk and shoes that fit improperly. Other causes of bunions include foot injuries. Deformities present at birth (congenital). Neuromuscular disorders, such as cerebral palsy or post- polio syndrome (post-poliomyelitis). Bunions may be associated with various forms of arthritis, including inflammatory or degenerative, causing the protective cartilage that covers your big toe joint to deteriorate. An occupation that puts extra stress on your feet also can be a cause. Waiters, factory workers, dancers and athletes often are more prone to developing bunions.
Symptoms
Pain in the toe joint and surrounding area. Painful to touch or press, and when walking. Growth of a bony lump (exostosis) at the side of the big toe joint. Irritated skin around the bunion. Redness. Thickening of overlying skin. Blisters may form more easily. Deformed bones, joints and ligaments as the big toe shifts towards the other toes. As the big toe shifts, its base becomes more prominent, forming the bunion. Eventually the big toe is forced to lie over, or more commonly under, the second toe. The second toe of patients who have bunions commonly forms a hammer toe. Trouble with shoes. It is difficult to find shoes that fit properly. Bunions may force you to buy a larger size shoe to accommodate the width the bunion creates. Eventually it hurts to wear any shoe, or even walk barefoot.
Diagnosis
Your doctor can identify a bunion by examining your foot. Watching your big toe as you move it up and down will help your doctor determine if your range of motion is limited. Your doctor will also look for redness or swelling. After the physical exam, an X-ray of your foot can help your doctor identify the cause of the bunion and rate its severity.
Non Surgical Treatment
Fortunately, many bunions never go on to cause problems other than the cosmetic appearance. The easiest option is to try different shoes or padding, however this is not the answer for everyone. The various straps and braces that are commercially available are not proven to be particularly effective.
Surgical Treatment
For very severe bunion deformities where there is considerable angulation between the first and second metatarsals an osteotomy of the metatarsal may not be sufficient and for these patients, the joint between the first metatarsal and the cuneiform bone is fused with screws, called the Lapidus procedure. This realigns the metatarsal completely and stabilizes the bone, preventing mobility and recurrent deformity.