A Roman device used in setting fractured bones and an extension mechanism for treating dislocated knees. Many mechanical inventions of the Greeks and Romans, such as the pulley and the winch, were applied to the treatment of fractures, dislocated limbs and spinal deformities. Medicine in ancient Rome combined various techniques using different tools. There was a strong Greek influence on Roman medicine, with Greek physicians including Dioscorides and Galen working and writing on medicine in the Roman Empire with knowledge of hundreds of herbal and other medicines. Ancient Roman medicine was divided into specializations such as ophthalmology and urology. A variety of surgical procedures were carried out using many different instruments including forceps, scalpels and catheters. No artist credited, undated.