The external knee eye, the calvarium point, is an acupoint of the foot Yangming Stomach meridian, specifically located on the lateral side of the knee, in the lateral depression of the patella and patellar ligament, when the knee is flexed. It can be used for the treatment of osteoarthritis of the knee, rheumatic or rheumatoid arthritis, meniscal injury, and lower limb paralysis. It can be used in combination with Yanglingquan, Knee Yangguan, Inner Knee Eye and He Ding points.