Knees can be damaged due to various reasons such as aging, obesity, arthritis, rheumatism, developmental abnormalities, injury, bone death, and more. If you have mobility issues or difficulty in climbing stairs, and getting up from the chair, your doctor may recommend knee surgery. In knee replacement surgery, the surgeon resurfaces the damaged bones with artificial implants made of plastic, metal, ceramic, and more. Knee surgery aims to ease pain, improve mobility and quality of life.