Introduction
Total knee replacement, also known as total knee arthroplasty, is a major surgical procedure in which a diseased or damaged knee joint is replaced with an artificial joint (prosthesis). This surgery is primarily recommended for patients suffering from severe osteoarthritis, rheumatoid arthritis, or post-traumatic arthritis that causes debilitating pain, stiffness, and loss of mobility. When conservative treatments such as medications, physical therapy, and joint injections no longer provide relief, a knee replacement can significantly reduce pain, restore function, and improve the patient’s overall quality of life. The artificial joint is designed to mimic the natural movement of the knee and can last for 15 to 20 years or more with proper care.

Surgical Procedure
The procedure is typically performed under general anesthesia (where the patient is fully asleep) or spinal anesthesia (which numbs the lower half of the body).
The orthopedic surgeon makes an incision across the front of the knee, usually 6 to 10 inches long, to access the joint. The surgeon then moves the kneecap (patella) aside and carefully cuts away the damaged cartilage and a small amount of underlying bone from the ends of the femur (thighbone) and tibia (shinbone).
Once the damaged tissue is removed, the artificial components are implanted. A metal component is attached to the end of the femur, and a metal and plastic component is attached to the top of the tibia. In some cases, the undersurface of the kneecap is also resurfaced with a plastic button. These components are secured to the bone using special surgical cement or a press-fit technique that allows the bone to grow into the implant. The surgeon tests the joint’s range of motion and stability before closing the incision with stitches or staples and applying a sterile dressing.

Surgical Risks
Total knee replacement is a major surgery and carries standard surgical risks. These include adverse reactions to anesthesia, significant blood loss during surgery that may require a blood transfusion, and a high risk of developing blood clots in the legs (deep vein thrombosis) or lungs (pulmonary embolism) due to post-operative immobility.

General Complications
Common complications during the recovery period include:
– Significant pain and swelling in the knee and leg, which are managed with prescribed medications and ice therapy.
– Stiffness in the new joint. Physical therapy is crucial to regain full range of motion.
– Bruising around the surgical site and down the leg.
– Difficulty sleeping due to pain and restricted sleeping positions.

Rare but Serious Complications
While most surgeries are successful, severe complications can occur:
– Joint Infection: Infection can occur superficially at the wound or deep around the prosthesis. Deep infections are serious and may require further surgery to clean the joint or even remove and replace the implant.
– Implant loosening or wear: Over time, the artificial components may loosen from the bone or the plastic spacer may wear down, requiring a revision surgery.
– Nerve or blood vessel damage: Structures around the knee can be injured during the procedure, leading to numbness or weakness.
– Continued pain or limited mobility despite surgery and rehabilitation.

Pre-operative Preparation
Thorough preparation is essential for a successful outcome:
– Medical Clearance: Comprehensive blood tests, an ECG, and a physical exam are required to ensure the patient is healthy enough for major surgery.
– Medication Management: Blood thinners, certain arthritis medications, and supplements must be stopped weeks in advance to reduce bleeding and interaction risks.
– Home Preparation: Patients should prepare their home for recovery by removing tripping hazards, installing grab bars in the bathroom, and arranging a sleeping area on the ground floor if possible.
– Fasting: Patients must fast for at least 8 to 12 hours before the surgery.

Post-operative Care
Patients typically stay in the hospital for 1 to 3 days. Pain management is a top priority, utilizing a combination of nerve blocks, IV medications, and oral painkillers. Physical therapy begins almost immediately, often on the day of surgery. A physical therapist will help the patient stand and walk using a walker or crutches and teach specific exercises to strengthen the leg and improve knee flexibility.

Wound Care
– Keep the surgical dressing clean and dry. The hospital staff will provide instructions on when it can be removed and when showering is safe.
– Do not submerge the wound in a bath or pool until fully healed and cleared by the surgeon.
– Monitor the incision for signs of infection, such as increased redness, warmth, swelling, or drainage.

Diet
A balanced diet rich in protein, iron, and vitamin C is recommended to promote tissue healing and replenish blood supply. Adequate hydration and high-fiber foods are important to prevent constipation caused by pain medications and decreased activity.

Post-discharge Notes
Recovery is a gradual process requiring dedication to physical therapy.
– Patients will need to use a walker or cane for several weeks.
– Driving is usually restricted for 4 to 6 weeks until the patient has regained sufficient muscle control and is off narcotic pain medications.
– High-impact activities (like jogging or jumping) should be avoided permanently to protect the implant, but low-impact exercises (walking, swimming, cycling) are encouraged.
– Contact your doctor immediately if you experience shortness of breath, chest pain, sudden severe swelling in the leg, or a high fever.