Osteo Arthritis
Arthritis is inflammation of a joint or a state characterized by by inflammation of joints. There are a number of different types and causes of arthritis. The most common is degenerative or osteoarthritis which is commonly known as the "wear and tear" type of arthritis.

This illustration shows a big toe joint where the joint has been damaged with arthritis. This is not a true bunion deformity but may be associated with bunions. If left untreated, it can increase the wear and tear in the joint and break down cartilage.

This x-ray shows the extensive damage that arthritis can do to a joint. The arrows are pointing to the area where there should be a joint. This has filled in with bone as the cartilage has been destroyed over time.  This joint will fuse and become inflexable (hallux limitus)

Also see Rheumatoid Arthritis

Custom orthotics are designed to decrease pain through modifications in first MTP joint motion by maintaining subtalar neutral posture of the foot, whereby preventing medial shifting of body weight over the great toe.  Maintaining proper foot function and biomechanics is key to unloading the first metatarsal phalangeal joint and decreasing the pain associated with this condition.