Egypt's second faith is Coptic Christianity. Copts are heirs of an ancient Christian rite. Coptic Christianity was the predominant religion in Egypt until the 10th century when a lot of Christians diverted to Islam. Christianity itself was brought in Egypt by St. Mark in the middle of the first century AD.
Other possible causes of swelling behind the knee include abscesses (infections); tumors of the skin, soft tissue, or bones; bleeding; deep venous thrombosis (blood clot in the deep veins of the legs); or deformity of the joint after a fracture of any of the bones of your knee joint.
When the posterior portion of the meniscus is torn, it may cause pain behind the knee (or all over the knee with more acute pain toward the rear). Other causes - Direct trauma to the knee may also cause behind knee pain. Your doctor will diagnose whether it is a knee sprain (overstretched ligaments) or a ligament tear. Blood Clots Behind Knee. It is important to note that pain and swelling behind the knee may be associated with blood clots.