Introduction:The plantaris muscle originates from the lower part of the lateral supracondylar ridge of the femur, passes between the gastrocnemius and soleus muscles, and inserts by a long slender tendon into the calcaneus. It is a vestigial muscle in humans and may vary in its origin, insertion, number of muscle belly and course of the plantaris tendon. These variations may influence the surgical outcome of the operations around the knee joint and the posterior compartment of leg.