Your doctor will examine the range of motion of your knee joint to know whether the Total Knee Replacement will help you. The surgeon will also assess the strength and stability of your knee joint. X-rays are helpful to determine the extent of damage to the knee joint. Your general health status, age, body weight, daily routine and size and shape of the knee are some factors to decide on the type of prostheses to replace the damaged knee joint. These factors are also helpful in choosing the type of knee replacement surgery.