1.   As Clinton stumbled, his knee twisted violently to the side, and he ripped more than half of his quadricep tendon away from his knee cap.

2.   Clinton left Andrews Air Force by car for surgery later today at Bethesda Naval Hospital in Maryland to reattach the torn quadricep tendon to his kneecap.

3.   Clinton was given an epidural, local anesthetic before beginning the two-hour operation to reattach the torn quadricep tendon to his kneecap.

4.   Hamilton hyperextended his knee, and strained his quadricep tendon.

5.   Johnson had surgery on the quadricep tendon of his left knee in May.