1. Swan-neck deformity is a bending in (flexion) of the base of the finger, a straightening out (extension) of the middle joint, and a bending in (flexion) of the outermost joint. The most common cause of swan-neck deformity is rheumatoid arthritis. Other causes include untreated mallet finger, looseness (laxity) of the fibrous plate inside the hand at the base of the fingers or of the finger ligaments, chronic muscle spasm affecting the hands caused by nerve damage (called muscle spasticity), other types of arthritis, a ruptured finger tendon, and misalignment in the healing of a fracture of the middle bone of the finger. Normal bending of the finger may become impossible. The deformity can therefore result in considerable disability. 2.Mallet Finger (Baseball Finger) Mallet finger is an injury to the thin tendon that straightens the end joint of a finger or thumb. Although it is also known as "baseball finger," this injury can happen to anyone when an unyielding object (like a ball) strikes the tip of a finger or thumb and forces it to bend further than it is intended to go. As a result, you are not able to straighten the tip of your finger or thumb on your own. 3.Boutonnière deformity is a deformity in which the middle finger joint is bent in a fixed position inward (toward the palm) and the outermost finger joint is bent excessively outward (away from the palm). Boutonnière deformity most often results from rheumatoid arthritis but can also result from injury (such as deep cuts, joint dislocations, or fractures) or osteoarthritis. People with rheumatoid arthritis can develop the disorder because they have long-standing inflammation of the middle joint of a finger. If the deformity is caused by an injury, the injury usually occurs at the base of a tendon (called the middle phalanx extensor tendon). As a result, the middle joint (called the proximal interphalangeal joint) becomes “buttonholed” between the outer bands of the tendon that runs to the end of the finger. That is, the bones of the joint push out through the bands of the tendon like a button #regainhealthphysiotherapy #dr_abhinesh #rheumatoidarthritis #orthophysiotherapy #medical #instapic #v https://www.instagram.com/p/CVIYVSqJviC/?utm_medium=tumblr
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