Knee replacement,also known as Total Knee Arthroplasty, is a common surgical procedure most often performed to relieve the pain and disability from degenerative arthritis, most commonly osteoarthritis, but other painful knee disease as well.
Hip replacement, also known Total Hip Arthroplasty, is a surgical procedure in which the hip joint is replaced by a prosthetic implant. Such joint replacement surgery is conducted to relieve arthritis pain or fix severe physical joint damage as part of the hip fracture treatment.