Undislocated lesions: Early diagnosis by Stark maneuver
Early diagnosis of injuries without dislocation is important. This is not
always easy due to the swelling and often inconclusive x-rays.
Keep the PIP joint hyperextended. Passively flex the DIP joint.
If passive movement of the DIP joint is limited, this is a strong indication
for the presence of a central slip detachment.
Compare with the uninjured hand.