Last Updated: October 8, References Approved. This article was co-authored by Chris M. Matsko, MD. Chris M.
Nodules on finger knuckles are a sign of osteoarthritis
5 Main Causes You Must Know About Thumb Joint Pain - Park Ridge Herald-Advocate
The knuckles are the joints of the fingers. Anatomically, it is said that the knuckles consist of the metacarpophalangeal  MCP and interphalangeal IP joints of the finger. The knuckles at the base of the fingers may be referred to as the 1st  or major knuckles while the knuckles at the midfinger are known as the 2nd  and 3rd, or minor, knuckles. However, the ordinal terms are used inconsistently, and can be found referring to any of the knuckles. The physical mechanism behind the popping or cracking sound heard when cracking joints such as knuckles has recently been elucidated by cine MRI to be caused by tribonucleation as a gas bubble forms in the synovial fluid that bathes the joint.
Is This Serious? Why Are My Thumbs Clicking, Cracking or Popping?
Last Updated: December 2, References Approved. There are 13 references cited in this article, which can be found at the bottom of the page. This article has been viewed , times. A broken knuckle can be extremely painful.
Pain in the middle knuckle of the finger is usually caused by trauma from an injury or inflammation of the joints within the hand. Rheumatoid and psoriatic arthritis can cause swelling and knuckle pain. Read below for more information on causes and treatment options.