The knee joint functions as a stabilizer for the lower extremity during weight bearing and allows large range of motion for various functional activities. The two primary articulations of the knee joint are the tibiofemoral joint and the patellofemoral joint.
1. electrocardiogram recorded between one limb and two other limbs. The augmented leads are designated aVF, aVL, and aVR for recordings made between the foot (left), left arm, and right arm, respectively, and the other two limbs. The definition information for augmented lead is provided by Stedman's.
lead II the standard bipolar limb lead attached to the right arm and left leg. lead III the standard bipolar limb lead attached to the left arm and left leg. augmented unipolar limb lead a modified unipolar limb lead; the three standard leads are: aVF (left leg), aVL (left arm), and aVR (right arm). aVF lead an augmented unipolar limb lead in which the positive electrode is on the left leg. aVL lead an augmented unipolar limb lead in which the positive electrode is on the left arm. aVR lead an augmented unipolar limb lead in which the positive electrode is on the right arm.