The Complete Guide to Knee Replacement Surgery

What is knee replacement?

Knee replacement surgery (also called knee arthroplasty) is a procedure in which damaged bone and cartilage in the knee joint are removed and replaced with artificial parts (implants) made of metal and plastic. The goal is to reduce pain and improve function when the knee has been worn down by arthritis or injury.

The surgery typically involves replacing the ends of the thigh bone (femur) and shin bone (tibia), and often the underside of the kneecap (patella), with smooth surfaces that allow the joint to move with less friction and pain.

Total vs. partial knee replacement

In a total knee replacement, the entire knee joint is resurfaced. In a partial (unicompartmental) knee replacement, only the most damaged part of the knee is replaced—usually either the inner or outer compartment. Your surgeon will recommend one or the other based on how much of the knee is affected and your age, activity level, and overall health.

Who needs it?

Knee replacement is usually considered when knee pain and stiffness limit daily activities—walking, climbing stairs, getting in and out of chairs—and when non-surgical options have not given enough relief.

Common reasons

• Osteoarthritis — Wear and tear of the cartilage that cushions the joint over time.
• Rheumatoid arthritis — An inflammatory condition that can damage the knee joint.
• Post-traumatic arthritis — Damage to the joint after a serious injury or fracture.

When it’s usually considered

Doctors typically suggest considering surgery when you have significant pain at rest or at night, swelling that doesn’t improve with rest or medication, a noticeable bow or deformity of the leg, and when X-rays or other imaging show clear joint damage. There is no single “right” age; suitability depends on your symptoms, general health, and goals. If you’re unsure whether you’re a candidate, a personalized knee care assessment can help you explore your options.

Risks and complications

Knee replacement is a major surgery. As with any operation, there are risks. Being informed helps you prepare and work with your care team to reduce them.

Possible risks

• Infection — Can occur at the incision or around the implant. Precautions include antibiotics and sterile technique; signs to watch for include fever, increased redness, swelling, or drainage.
• Blood clots — Deep vein thrombosis (DVT) or pulmonary embolism. Early movement, compression devices, and sometimes blood thinners are used to lower risk.
• Implant problems — Loosening, wear, or dislocation over time. Implants can last many years but may eventually need revision surgery.
• Nerve or blood vessel injury — Rare but possible during surgery.
• Stiffness or ongoing pain — Some people have limited bend or persistent discomfort; physiotherapy and sometimes further treatment may be needed.

Your surgeon will discuss your personal risk profile based on your health, medications, and lifestyle. Asking questions and following pre- and post-operative instructions can help minimise complications.

Recovery timeline

Recovery varies from person to person. The following is a general guide; your care team will give you a plan tailored to you.

First few days

You will usually stay in hospital for one to three days. Pain is managed with medication. You’ll be encouraged to move your ankle and, when ready, to stand and walk with support. Preventing blood clots and starting gentle movement are priorities.

First few weeks

At home, you’ll work on walking, bending the knee, and building strength. Many people use a walker or crutches for a few weeks. Physiotherapy is a central part of recovery—either at home or in a clinic. Sticking to your exercises helps restore motion and strength.

First three to six months

Most people see steady improvement over several months. Swelling and discomfort gradually decrease. You can usually return to light daily activities within a few weeks and to most activities by three to six months. High-impact sports or heavy labour may need to be limited or avoided to protect the new joint.

Support from physiotherapists and dietitians can help you through this phase. Planning ahead with your surgeon and rehab team makes the journey smoother.

Alternatives to surgery

Surgery is not the only option for knee pain. Many people find relief with non-surgical approaches, either on their own or in combination. Exploring these is reasonable before deciding on an operation.

Lifestyle and physical approaches

• Weight management — Reducing excess weight lowers stress on the knee and can ease pain.
• Physiotherapy — Strengthening and stretching can improve support around the joint and reduce symptoms.
• Activity modification — Avoiding high-impact activities while staying as active as possible.

Medications and injections

Over-the-counter or prescription pain relievers, anti-inflammatories, and sometimes corticosteroid or hyaluronic acid injections can help manage pain and inflammation. Your doctor can explain benefits and risks for your situation.

Complementary and alternative options

Some people try therapeutic yoga, diet and nutrition support for inflammation, Ayurveda, or homeopathy as part of a broader plan. Evidence for these varies; it’s important to discuss them with your doctor and choose qualified practitioners. If you want to explore non-surgical paths, you can compare options for knee care without surgery in one place.

Deciding between surgery and alternatives is personal. A free knee assessment can help you see your options in one place—surgical and non-surgical—so you can decide with clarity.

Questions to ask your surgeon

Coming to your consultation with a list of questions helps you get the information you need and feel more confident in your decision.

About the procedure

• Do you recommend total or partial knee replacement for me, and why?
• What type of implant do you use, and what are its track record and expected lifespan?
• How many knee replacement surgeries do you perform each year?

About recovery and outcomes

• What does a typical recovery timeline look like for someone like me?
• What are the main risks in my case, and how do you work to reduce them?
• When can I expect to return to daily activities, work, and light exercise?

About the hospital and team

• Where will the surgery be performed, and what support is available there (e.g. physiotherapy, pain team)?
• Who will be part of my care team before and after surgery?

How to compare surgeons

Choosing a surgeon is a big step. You want someone experienced, with good outcomes and a approach that fits your needs. Here’s a practical way to compare.

Experience and volume

Surgeons and hospitals that perform knee replacement regularly tend to have more refined protocols and, in many studies, better outcomes. Ask about annual volume and whether the surgeon specialises in joint replacement.

Outcomes that matter

Where available, look at infection rates, revision rates, and patient-reported outcomes (e.g. pain and function scores). Not all hospitals publish this data, but you can ask your surgeon or hospital for information.

Communication and fit

You should feel that your questions are answered clearly and that the surgeon explains risks and benefits in a way you understand. Trust and communication are part of good care.

At HealNixa we help you compare knee replacement surgeons and hospitals using objective data—without hospital bias—so you can shortlist options that match your priorities. You can also read more about our approach to transparency and how we stay patient-first.

Frequently asked questions