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.
A tear to the cartilage-like meniscus can also result in pain in the back of the knee, depending upon what sort of tear occurs. Pain and swelling behind the knee is common with a meniscus tear; the severity of the pain and whether the stability of the knee is compromised depends upon the extent of the tear. This pain behind the knee when itâs bent will often intensify during a deep knee flex or when getting up after sitting.