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While the cause of rheumatoid arthritis is not clear, it is believed to involve a combination of genetic and environmental factors. [1] The underlying mechanism involves the body's immune system attacking the joints. [1] This results in inflammation and thickening of the joint capsule. [1] It also affects the underlying bone and cartilage. [1]
Rheumatoid arthritis is a primary cause of swan-neck deformity due to the presence of inflammation of the joints. [11] Additionally, swan-neck deformity can be caused by weakening or tearing of the ligament and tendon on the middle joint of a finger. [ 10 ]
Initially, the finger may catch during movement but symptoms like pain, swelling and a snap may occur with time. The finger often gets locked in one position and it may be difficult to straighten or bend the finger. Trigger finger has been found to be associated with diabetes, gout and rheumatoid arthritis.
Any type of cold can be a trigger, including reaching into the freezer, holding a chilled drink or relaxing in an air conditioned room. ... Makol says. People with lupus and rheumatoid arthritis ...
[2] [8] [9] The most common forms are osteoarthritis (most commonly seen in weightbearing joints) and rheumatoid arthritis. [2] Osteoarthritis usually occurs as an individual ages and often affects the hips, knees, shoulders, and fingers. [5] Rheumatoid arthritis is an autoimmune disorder that often affects the hands and feet. [5]
Swan neck deformity has many of possible causes arising from the DIP, PIP, or even the MCP joints. In all cases, there is a stretching of the volar plate at the PIP joint to allow hyperextension, plus some damage to the attachment of the extensor tendon to the base of the distal phalanx that produces a hyperflexed mallet finger.