What is ulnar deviation? Ulnar deviation is also known as ulnar drift. This hand condition occurs when your knuckle bones, or metacarpophalangeal (MCP) joints, become swollen and cause your fingers to bend abnormally toward your little finger.

What does ulnar deviation do?

Ulnar deviation causes the fingers to bend toward the outside of the hand. This condition often results from chronic inflammation relating to conditions such as arthritis. However, people can develop ulnar deviation due to problems affecting the muscles or ligaments in the hand.

Can ulnar deviation be fixed?

The ulnar drift splint is recommended for persons whose ulnar deviation at the MCP joints can be corrected with mild to moderate force. The splint fits the top of the hand and allows free hand function during day-time wear as the palm of the hand is free enough for gripping objects.