What Is Knee Replacement Surgery?
During surgery, the worn-out surfaces of the thigh bone, shin bone, and sometimes the kneecap are resurfaced and replaced with prosthetic parts. A new knee joint typically functions very close to normal, and most implants last 15 years or more. The procedure is safe, with long-term success rates around 97% after 12 years of follow-up.
Who May Need Knee Replacement?
Your doctor may recommend knee replacement if you experience:
- Severe arthritis of the knee joint
- Persistent pain that interferes with daily activities and self-care
- Significant leg deformity (such as bowed or knock-knees)
- Arthritis following an injury to the knee joint
- Rheumatoid arthritis or other inflammatory joint disease
- Long-standing knee pain and swelling not relieved by other treatments
Types of Knee Replacement Surgery
Total Knee Replacement (TKR)
- Femoral component (thigh bone): Made of metal, covers the end of the femur
- Tibial component (shin bone): A metal base with a durable medical-grade plastic (UHMWPE) insert
- Patellar component (kneecap): A plastic dome that may or may not be replaced depending on your condition
For patients with arthritis in both knees, a bilateral replacement may be recommended. Modern techniques, including computer-assisted navigation, help surgeons achieve precise implant alignment and improve long-term outcomes.
Partial (Unicondylar) Knee Replacement
In some patients, only one side of the knee is damaged. In these cases, a partial or unicondylar knee replacement may be performed. This procedure is less extensive, typically less costly, and allows for faster recovery. Only your surgeon can determine if you are a candidate for this option.
Robotic-Assisted Knee Replacement
Robotic systems help surgeons plan and perform knee replacement with greater accuracy. Benefits include better implant alignment, less tissue damage, faster recovery, and improved long-term outcomes. The surgeon remains in full control—the robot simply enhances precision.
Understanding the Knee Joint
The knee is a hinge joint where the thigh bone (femur) and shin bone (tibia) meet. The ends of the bones are cushioned by smooth cartilage, supported by ligaments, tendons, and muscles that provide stability and motion. When this cartilage wears out, bones rub against each other, causing pain, stiffness, and reduced mobility. Knee replacement restores these surfaces, giving back comfort and function.
What to Expect After Surgery
Immediately After Surgery
- You will be moved to a recovery area for monitoring.
- A bandage and drain tube may be placed around your knee to reduce swelling and prevent infection.
- An intravenous (IV) line delivers fluids, antibiotics, and sometimes blood transfusions.
- In some cases, a urinary catheter may be used temporarily.
- Your vital signs, such as heart rate and blood pressure, will be continuously monitored.
Physiotherapy and Recovery
- First 24 hours: Gentle in-bed exercises are started under supervision.
- Day 1–2: The drain is removed, and you may sit up with support.
- Day 2–3: You will be encouraged to stand and take steps with a walker.
- End of week 1: Walking with assistance becomes easier; you may use the restroom with a raised seat.
- 2 weeks: Stitches are removed.
- 3 weeks: Most patients can walk with a stick and gradually increase activity.
With regular physiotherapy, most people experience significant pain relief, improved mobility, and better quality of life.
Anatomy of the knee
Joints are the areas where 2 or more bones meet. Most joints are mobile, allowing the bones to move Basically, the knee is 2 long leg bones held together by muscles, ligaments, and tendons. Each bone end is covered with a layer of cartilage that absorbs shock and protect the knee.
Key Takeaways
- Knee replacement is a safe and effective procedure for people with severe knee arthritis or long-term pain.
- Both total and partial replacements are available depending on your condition.
- Early physiotherapy and guided rehabilitation are essential for recovery.
- Most implants last well over a decade, giving patients years of improved mobility and independence.