Posterior Knee Pain

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Posterior knee pain is pain at the back of the knee.

If you are not sure what your injury is then why not try our sports injury symptom checker?

Below we outline the most common causes of pain at the back of the knee, less common causes as well as important conditions and injuries that should not be missed.

Biceps femoris tendonitis (hamstring tendonitis) is probably the most common over use injury at the back of the knee although referred pain and various causes of swelling are also likely causes of pain at the back of the knee.

Common causes of posterior knee pain

Biceps femoris tendonitis is inflammation of one of the hamstring tendons as it inserts into the back of the knee. Symptoms include pain and swelling at the point where the tendon attaches to the bone. There may be pain when bending the knee against resistance with stiffness after exercise and in the mornings. Biceps femoris tendonitis can be brought on by downhill running, kicking sports and sprinting.

Swelling on the knee or knee effusion can occur following an acute knee injury that has not healed properly. A Baker's cyst or large swelling at the back of the knee may also occur. The cause of the swelling must be identified and treated. In particular rest and cold therapy can help reduce the effusion but identifying the cause of the swelling is important to prevent it recurring.

Referred pain is where an injury or problem elsewhere causes pain at the back of the knee. This can be from the lower back or lumbar spine and pain is referred down into the knee through the sciatic nerve. Or pain from the patellofemoral joint or between the kneecap and thigh bone can also refer pain into the back of the knee.

Less common causes of posterior knee pain

Bakers Cyst or Popliteal cyst is a localized swelling at the back of the knee. It is usually caused by an injury or condition in the knee joint which will make the back of the knee swell up increasing pressure and causing pain. There is usually a very obvious round golf ball sized swelling at the back of the knee.

Popliteus tendonitis or injury is 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. Symptoms include pain at the back of the knee joint with tenderness when pressing in. Pain may be reproduced when the knee is bent against resistance whilst the lower leg or tibia bone is rotated outwards.

Gastrocnemius tendonitis is inflammation of the tendon of the large calf muscle at the point it originates at the back of the knee. This is an over use injury and usually affects the inside back of the knee joint where the muscle originates.

Important do not miss

Deep vein thrombosis or DVT as it is known for short is a blot clot in a vein common in the calf muscle. It usually occurs following surgery or a long period of immobilization in the calf muscle itself although can occur in the back of the knee. It is very important this is not missed or confused with a calf strain as serious injury or death could result if wrongly treated.

Posterior cruciate ligament injury is a tear or sprain to the posterior cruciate ligament at the back of the knee. The role of this ligament is to prevent the knee from bending back the wrong way and is usually injured when the knee is forced to do just that. Symptoms include pain at the time of injury with possibly a little swelling depending on how bad the injury is. The athlete may complain of the knee feeling unstable and giving way beneath them.

Claudication is pain or cramping in the legs due to insufficient blood flow and / or tiredness.

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