What is the word when forefingers lock?

Trigger finger: This occurs when there is swelling of the tendon of the muscle that moves the finger. This snags in the pulley through which the tendon runs and can prevent with some pain, the full motion. By elevating the limb, you can reduce the swelling and get the area to move through the pulley. Of course if the locking of the forefingers is with a partner - then this is probably love.