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.
Osgood-Schlatter disease causes a painful swollen bump on the shin below the knee. A broken hip is a break in the thighbone under the hip joint and causes pain and trouble or inability to walk. A broken ankle is a break in a bone that meets at the ankle joint and causes pain, bruising and swelling.