When the knee is flexed, Xiyangguan GB-33 is 3 cun above Yanglingguan GB-34, lateral to the knee joint, in the depression between the tendon of biceps femoris and the femur muscle.
How to locate
Xiyangguan GB-33 is best located with the patient’s knee flexed. On the level of the lateral upper border of the patella, palpate in a lateral direction towards the thigh and palpate for the distal end of the lateral epicondyle of the femur.
Then locate GB-33 in a clearly palpable depression between the epicondyle and the tendon of the biceps femoris muscle. The latter runs along the lateral aspect of the leg, along the line of an imaginary trouser seam, and attaches inferior to the knee joint at the head of the fibula.