Biceps femoris tendonitis is the inflammation of one of the hamstring tendons as it inserts into the back of the knee, explains Sportsinjuryclinic.net. Symptoms include pain and swelling where the tendon attaches to the bone. Pain may occur when bending the knee, with stiffness after exercise and in the mornings.
Other less common causes of posterior knee pain include Baker's cyst and popliteus tendonitis, notes Sportsinjuryclinic.net. The first, a localized swelling at the back of the knee, is usually the result of an injury or condition in the knee joint which makes the back of the knee swell, increasing pressure and causing pain. It usually includes a very obvious, round, golf ball-sized swelling at the back of the knee. The latter is an inflammation or injury to the small muscle at the back of the knee called the popliteus. The role of the popliteus muscle is to internally rotate the tibia or shin bone.