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.
There can be several reasons for swelling or inflammation of the knee and the pain associated with swollen knee can be mild to severe. The swelling can be acute or due to sudden injury and sometimes it can be gradual process due to accumulation of synovial fluid. Similarly swelling can be inside the knee or in its neighboring regions. Before the doctor begins treatment, he should find out what exactly is the cause of swollen knee.