Answer
Athroplasty or joint replacement is done for three main reasons:
1. Relief of joint pain
2. Increase of range of motion of the relevant structures
3. Increase of mobility especially in cases of arthoplasty of knee and hip joints
Work Step by Step
Athroplasty is surgical repalcement of parts of a joint with artificial materials like steel, chromium, nickel, plastic and titanium.
This kind of operation usually improves mobility, and range of motion, and probably most important for many patients, abolishes persistent pain or relieves it considerably.