What is the MCP Joint?

The metacarpophalangeal joints (MCP) are often called "knuckles." They are the articulations where the fingers and thumb attach to the hand. You may not think much about your knuckles' role in daily life, but they are vital to the seemingly endless functional capabilities of the hand and fingers.

The MCP joints are most prominent when making a fist and facilitate anything that requires opening or closing the hand. Can you think of any hand function or movement that does not require using the MCP joints? These joints help us grip, pinch, bend or straighten, and move together or spread apart the fingers.

When the MCP joints lack functional range of motion, a person's ability to independently perform basic activities of daily living can be severely compromised. These joints make it possible to feed ourselves, drink, bathe, drive, type, hold, grip items, etc.

The MCP joints' normal range of motion values is 90-100 degrees of flexion and 30-45 degrees of extension. People can lack range of motion in these joints for various reasons. Some of the most common indications for the use of a Joint Active Systems (JAS) MCP device are: 

  • Tendon/Ligament Repairs

  • Fractures / Dislocations

  • Arthritis

  • Volar Plate Injuries

  • Burn Injuries

  • Crush Injuries

  • Scar Tissue Release

  • Tendon Release 

If you struggle with range in the MCP joints, ask your physician or therapist if the JAS device is suitable for you. 

NewsMichael HaganNews