Certain hereditary conditions, such as joint ligament laxity and malformed joints.Risk factorsįactors that can increase your risk of thumb arthritis include: The damage to the joint might result in growth of new bone along the sides of the existing bone (bone spurs), which can produce noticeable lumps on your thumb joint. The bones then rub against each other, resulting in friction and joint damage. With thumb arthritis, the cartilage that covers the ends of the bones deteriorates, and its smooth surface roughens. In a normal thumb joint, cartilage covers the ends of the bones - acting as a cushion and allowing the bones to glide smoothly against each other. Previous trauma or injury to the thumb joint also can cause thumb arthritis. Thumb arthritis commonly occurs with aging.
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