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.
Knee Problems. Pain behind the knee. Pain at the back of the knee can be from problems with the bones, muscles, tendons, ligaments, nerves, blood vessels and the bursae. Very few of these require surgical intervention. Bakers Cyst. All knees produce fluid to aid in lubrication of the joint and to provide nutrition to the joint lining cartilage cells.