Joint replacement. When is joint replacement done? When the joints are severely degenerated, causing disturbing pain and restriction of activities of daily living like walking climbing stairs, getting up from sitting position even in sleep is disturbed, joint replacement placement is advised. What are common conditions that require joint replacement? 1.Osteo arthritis – this is a condition when the smooth surfaces of joints have lost their smoothness , surfaces are irregular due to crater formation. Increased bony protrusion from the sides of bones. Stiffness has set in the joints. 2.Avascular necrosis of femur (AVN) .damage to the femoral head in the hip joint due to reduced blood supply Deformities of bones– long-standing deformities lead to change in the pressure points and forces on the joint leading to faster degeneration. Bow leg deformity, knock knee deformities. 3.Arthritis of joint due to some condition such as rheumatoid disease, tuberculosis and others. And many other such conditions as Trauma Tumours...