AAROM MCP joints with overpressure (Finger MCP joint flexion/extension AAROM, end range)

Start in a seated position.
Place your affected arm on a table, holding the forearm up.
Place the fingers of your other hand firmly just below the knuckles to stabilise this area.
Try to bend and straighten your finger at this joint, fixing the hand so as to ensure the movement comes from the correct area.
Use the finger of your other hand to push the movement further.