Also, the tendons in the fingers can remain stuck or stiff (trigger finger or stenosing paratonitis of finger flexors or De Quervain's disease). A steroid infiltration offers relief in half of the cases.
Otherwise, you need to free the tendon by opening its sheath under local anesthesia. (Decompression of the finger flexors' sheath or the De Quervain thumb extensor).
Arthritic tendon blockages can be caused by nodules that can be removed with minor surgery.