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 is an overuse condition or injury of the knee that causes pain and swelling below the knee area over the shin bone in growing children and adolescents.sgood-Schlatter disease is characterized by inflammation of the patellar tendon and surrounding soft tissues. It is caused by the constant pulling of the patellar tendon on the area below the knee where the tendon attaches.