Surgery, a major branch of medical science, is concerned with treating disorders, injuries and physical deformities by means of interventions using equipment and instruments in or on the body.
A surgeon treats disorders or injuries using surgical interventions such as osteosynthesis to knit broken bones back together again. Increasingly, these days, surgeons use the latest techniques, such as lasers, endoscopy (use of an optical instrument) or even robots. In spite of all this, traditional methods such as plaster casts and splints continue to be used where appropriate.
Many surgeons specialise in certain parts of the body, e.g. the heart, blood vessels or brain.