Symptoms of a full-thickness tendon tear vary depending on the location of the injury, but typically involve pain, weakness and inability to use the injured extremity, according to the American Academy of Orthopedic Surgeons. The rotator cuff is the most common type of tendon tear, and symptoms can include pain at rest, especially when lying on the affected side; pain upon lifting or lowering the arm; weakness with lifting or arm rotation; and a crackling sensation with certain shoulder movements.
A full-thickness tear of the rotator cuff tendon usually causes intense pain at the time of injury, reports the AAOS. There may also be a snapping sensation and immediate weakness in the arm.
The quadriceps tendon works with the thigh muscles to strengthen the leg. A complete tear of the quadriceps tendon is a serious injury that typically requires surgery to regain knee function, states the AAOS. A complete tear of this tendon causes the thigh muscles to detach completely from the knee, making it impossible to straighten the knee. Other symptoms include a tearing or popping sensation at the time of the injury, sagging or drooping of the kneecap, and difficulty walking due to buckling of the affected knee.