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.
For a routine analysis of the heartâs electrical activity an ECG recorded from 12 separate leads is used. A 12-lead ECG consists of three bipolar limb leads (I, II, and III), the unipolar limb leads (AVR, AVL, and AVF), and six unipolar chest leads, also called precordial or V leads, (, , , , , and).hapter V The 12-Lead EKG. This chapter presents an introduction to the 12-lead ECG. The 12-lead ECG gives a tracing from 12 different âelectrical positionsâ of the heart. Each lead is meant to pick up electrical activity from a different position on the heart muscle.