Knee replacement refers to artificial knee joint replacement.The benefits of knee replacement at the age of 70 years include: improving joint function, reducing complications, enhancing one’s mobility, and improving general condition. Artificial knee replacement is suitable for elderly patients with osteoarthritis. Severe osteoarthritis can lead to wear and tear of the joints and impaired joint movement, and due to the inconvenience of walking and prolonged bed rest, it can also lead to complications such as pneumonia, decubitus ulcers, muscular atrophy, and venous thrombosis of the lower extremities. For 70 year olds, artificial knee replacement can effectively eradicate advanced knee pain, improve knee function, and restore the ability to walk on the ground and live a normal life. The quality of life of the elderly can be greatly improved. It is recommended that elderly patients suffering from osteoarthritis should choose the appropriate treatment method under the guidance of specialists according to their own situation and specific conditions.