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Less common causes of posterior knee pain. 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.
Read on to find out the most common causes of knee pain; whatever the cause may be, it is of utmost importance to get a condition like persistent knee pain checked. 1. Bursitis. Inflammation of one or more small sacs (also called bursa) cushioning the area of friction between joints of the knees is called Bursitis. Each of the knees has 11 bursae. Bursa which lies over the kneecap or on patella of a knee gets aggravated and becomes the reason for swelling, also causing knee pain. The condition can cause extreme pain and even limit your mobility. Use of anti-inflammatory medications can treat bursitis. However, you should call your doctor right away if you notice fever in addition to swelling of your knee.