Knee Replacement Surgery: What to Expect Before, During, and After

Knee pain that keeps you from walking, climbing stairs, or simply getting a good night's sleep can quietly take over your life. When arthritis or injury has worn down the knee joint beyond what medicine or physiotherapy can fix, knee replacement surgery offers a proven way to get moving again. Here is a detailed, easy-to-follow guide, along with two Hindi-language explainer videos.

What Is Knee Replacement Surgery?

Knee replacement (also called knee arthroplasty) is a surgical procedure in which the damaged surfaces of the knee joint are removed and replaced with an artificial implant made of metal and medical-grade plastic. The goal is simple: relieve pain, restore movement, and let you return to everyday activities like walking, climbing stairs, and standing without discomfort.

The knee joint is formed where the thigh bone (femur), shin bone (tibia), and kneecap (patella) meet. Over the years, the smooth cartilage that cushions these bones can wear away — most commonly due to osteoarthritis, but also rheumatoid arthritis, old injuries, or long-standing deformity. Once the cartilage is gone, bone rubs against bone, causing pain, stiffness, and swelling.

Who Needs a Knee Replacement?

• Constant or severe knee pain that limits daily activities such as walking, climbing stairs, or getting up from a chair
• Knee pain that continues even while resting or at night
• Chronic knee inflammation and swelling that doesn't improve with rest or medication
• Knee deformity — a bowing in or out of the knee
• Failure to improve substantially with other treatments such as anti-inflammatory medication, physiotherapy, injections, or the use of a walking support

Doctors typically recommend surgery only after conservative treatments — medications, physiotherapy, weight management, and injections — have failed to provide lasting relief.

Types of Knee Replacement

• Total Knee Replacement (TKR) – The most common type, where all three compartments of the knee are resurfaced with an artificial implant.
• Partial (Unicompartmental) Knee Replacement – Only the damaged part of the knee is replaced, which can mean a smaller incision and faster recovery for suitable candidates.
• Robotic-Assisted Knee Replacement – Uses computer-guided precision to plan implant positioning, which can improve alignment and implant longevity.
• Revision Knee Replacement – Performed when a previous knee replacement has worn out or failed and needs to be replaced.

How the Surgery Is Performed

1. Anesthesia. Most patients receive spinal (regional) anesthesia, which numbs the lower body while you remain awake, though general anesthesia is also an option.
2. Preparing the bone. The surgeon removes the damaged cartilage and a small amount of underlying bone from the end of the femur and top of the tibia.
3. Positioning the implant. Metal components are fitted to the femur and tibia, with a plastic spacer placed between them to allow smooth, cushioned movement.
4. Resurfacing the kneecap, if needed. The undersurface of the kneecap may also be resurfaced with a plastic component.
5. Closing up. The incision is closed with sutures or staples, and a sterile bandage is applied.

The procedure usually takes one to two hours, and most patients are encouraged to stand and take a few assisted steps within 24 hours of surgery.

Recovery and Rehabilitation

• Hospital stay: Typically two to four days, depending on your recovery pace and any other medical conditions.
• First few weeks: Physiotherapy begins almost immediately to restore strength and range of motion. A walker, crutches, or cane is generally needed at first.
• 6 to 12 weeks: Most people can resume light daily activities and driving once cleared by their surgeon.
• 3 to 6 months: Strength and confidence continue to build; many patients return to activities like swimming, cycling, and brisk walking.
• Long-term: Modern knee implants can last 20-25 years or longer with good care, though high-impact activities are generally best avoided to protect the implant.

Risks and Considerations

Knee replacement has a very high success rate, but like all major surgery it carries some risk, including:

• Infection at the surgical site or around the implant
• Blood clots in the leg veins (deep vein thrombosis)
• Stiffness or limited range of motion
• Implant loosening or wear over time
• Nerve or blood vessel injury (rare)

Following your surgeon's pre- and post-operative instructions closely, along with committed physiotherapy, greatly reduces these risks.

Tips for a Smooth Recovery

• Do your prescribed exercises daily, even when they feel repetitive — consistency is what rebuilds strength and flexibility.
• Use ice packs to manage swelling as advised by your physiotherapist.
• Arrange your home in advance — remove loose rugs, add railings if needed, and keep frequently used items within easy reach.
• Maintain a healthy weight to reduce stress on your new joint.
• Attend every follow-up appointment so your surgeon can track healing and implant position.

The Takeaway

Knee replacement surgery has helped millions of people worldwide walk without pain again. While the idea of surgery can feel intimidating, modern techniques, experienced surgical teams, and structured rehabilitation programs make recovery smoother than most people expect. If knee pain is holding you back from daily life, a conversation with an orthopedic surgeon is a good first step toward finding out whether knee replacement is right for you.