Knee replacement surgery, also known as knee arthroplasty, is a surgical procedure designed to alleviate pain and improve mobility in individuals with severe arthritis or significant knee injuries. This surgery resurfaces the damaged knee joint by replacing damaged cartilage and bone with metal and plastic parts that cap the femur, tibia, and kneecap. These prosthetics not only restore the knee’s structure but also mimic its natural movements, allowing patients to walk, bend, and even climb stairs with ease.
The knee is a complex joint where the femur (thighbone), tibia (shin bone), and patella (kneecap) meet. It’s held together by muscles, ligaments, and tendons, each playing a vital role in its functionality. At its core, cartilagecushions the bone ends, reducing friction and absorbing the impact of every step, jump, or sprint. Surrounding the joint is the synovial membrane, a protective lining that secretes synovial fluid to keep movements fluid and friction-free.
The knee’s stability comes from ligaments, which act like sturdy ropes. Some, like the anterior and posterior cruciate ligaments, prevent the tibia from sliding too far forward or backward, while others ensure side-to-side stability. Tendons, on the other hand, connect powerful muscles to bones, with the quadriceps extending the knee and the hamstrings flexing it. Adding to its versatility is the meniscus, a crescent-shaped cartilage that deepens the joint, spreads load evenly, and absorbs shocks. Together, these elements form a joint that supports the body’s weight, absorbs impact, and allows seamless movement making it vital yet prone to wear and injury.
Knee replacement surgery is often considered when arthritis becomes debilitating, causing relentless pain, stiffness, and reduced mobility. Patients often consider knee replacement when nonsurgical treatments fail to manage pain or restore mobility.
Arthritis in the knee can stem from various causes. The most common type, osteoarthritis is a degenerative condition where the cartilage protecting the ends of bones wears away, leading to pain and stiffness. It typically affects middle-aged and older adults. Rheumatoid arthritis, causes inflammation of the synovial membrane, producing excessive synovial fluid which can result in joint swelling, pain, and restricted movement. Traumatic arthritis which stems from an injury can damage cartilage and disrupt knee function, often occurring after fractures, ligament tears, or meniscal injuries.
Knee replacement procedure is designed to address debilitating knee pain. The surgery’s primary goal is to resurface the parts of the knee joint that have been worn down by arthritis or injury. By replacing these damaged surfaces with durable prosthetic components, the procedure eliminates the bone-on-bone grinding and inflammation that cause pain and restrict mobility.