The Basics of Finger Joints

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The PIP is a joint in the finger.

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Distal Interphalangeal Joint (DIP)
The DIP joint in the finger is located at the tip of the finger, just before the finger nail starts. The index finger is more likely to develop arthritis from the pinch force that occurs throughout one’s life.

Proximal Interphalangeal Joint (PIP Joint)
The PIP joint is the first joint of the finger and is located between the first two bones of the finger. The PIP joint can bend and extend the finger. It becomes stiff easily after injury.

Metacarpophalangeal Joint (MCP joint)
The MP joint is where the hand bone called the metacarpal meets the finger bones called the phalanges. A single hand bone is called a phalanx. MP joints are important for both power grip and pinch activities; they are where the fingers move with respect to the hand. The MP joints allows you to bend and flex your fingers, spread your fingers, and bring the fingers together. You can spread your fingers more more easily when they are straightened rather than bent because the collateral ligaments are loose when the finger is extended.
 

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