ACTION: Flexes the knee, extends the hip
REFERRAL: Posterior knee

COMMENTS: These three muscles, the biceps femoris, the semitendinosus and the semimembranosus muscles control the pull on the knee joint. The only one that refers pain into the posterior knee, however, is the biceps femoris. The other two muscles are covered in the hip section. Also notice trigger points at the top of the gastrocnemius that refer to the posterior knee. There is also a trigger point on the popliteus that refers to the same location. For all posterior knee pain, address all these muscles.