Does a hand tendon injury have major presenting symptoms?

Usually: Usually an injury to the hand will result in lack of full extension or flexion in one of the fingers. In some cases where there is a laceration, the specific injury is more obvious. In some cases a tendon might be injured without a laceration making the diagnosis and a precise orthopedic exam very important. Most tendon injuries need to be treated shortly after the injury for the best result.

Loss of function: If a tendon is cut or ruptures, it can no longer straighten or bend the joint it is crossing. So if you lose the ability to bend or straighten a joint, there is a good chance you have a tendon injury.