5 August, 2026

Knee Replacement Surgery: Who Needs It, How to Prepare, Implant Choices & Recovery

Persistent knee pain can gradually change the way you live. Walking to a nearby shop becomes difficult, climbing stairs feels exhausting, sleep may be disturbed by pain, and even standing for a few minutes can become uncomfortable.

When knee arthritis or joint damage reaches an advanced stage and non-surgical treatments are no longer providing meaningful relief, knee replacement surgery may be considered to reduce pain and restore function.

However, the decision should not be based on an X-ray alone. The most important question is:

How much is your knee affecting your everyday quality of life?

Dr. Arun Kannan, Senior Consultant Orthopaedic Surgeon at Apollo Hospitals, Greams Road, Chennai, and Jayam Ortho Care, Kodambakkam, explains the important factors patients should understand before considering knee replacement.

What Is Knee Replacement Surgery?

Knee replacement, also known as knee arthroplasty, is a procedure in which damaged surfaces of the knee joint are removed and resurfaced with specially designed artificial components.

The purpose of surgery is not simply to change what the X-ray looks like. The main goals are to:

• Reduce persistent knee pain
• Improve walking ability
• Improve knee function
• Correct significant deformity when appropriate
• Improve independence in everyday activities
• Help patients regain a better quality of life

In a total knee replacement, damaged bone and cartilage are replaced with metal and medical-grade plastic components that recreate the surfaces of the knee joint.

Who Is an Appropriate Candidate for Knee Replacement?

There is no single test that decides whether someone needs knee replacement.

Age alone does not determine the decision either.

A patient may be considered for knee replacement when pain and loss of function have become significant enough to interfere with everyday life, particularly when appropriate non-surgical treatment is no longer giving adequate relief.

Some important signs include:

1. Persistent Daily Knee Pain

Pain occurring on most days is an important consideration.

This may include pain while:

• Walking
• Standing
• Using stairs
• Getting up from a chair
• Performing household activities
• Travelling
• Sleeping at night

Occasional discomfort alone does not necessarily mean that knee replacement is required.

2. Your Walking Distance Has Reduced Significantly

Ask yourself:

How far can I comfortably walk today compared with a few years ago?

If knee pain limits you to only a few minutes of walking or forces you to repeatedly stop and rest, your knee problem may be significantly affecting your functional independence.

For example, someone who previously walked comfortably for 30–40 minutes but can now manage only 5–10 minutes because of knee pain has experienced an important change in function.

3. Everyday Activities Are Becoming Difficult

Knee replacement becomes more relevant when arthritis interferes with normal life.

Patients may struggle with:

• Going shopping
• Walking within the workplace
• Climbing stairs
• Getting into or out of a vehicle
• Standing while cooking
• Visiting family or friends
• Travelling
• Exercising
• Performing religious or social activities

The impact on quality of life and independence is often more important than the X-ray appearance by itself.

4. Pain Continues Despite Appropriate Non-Surgical Treatment

Before knee replacement is considered, many patients may benefit from non-operative treatments such as:

• Activity modification
• Weight management where appropriate
• Physiotherapy
• Muscle-strengthening exercises
• Pain medication when medically suitable
• Injections in selected patients
• Walking aids when required

When these measures no longer provide adequate relief and the knee continues to severely affect everyday life, surgery may become a reasonable option.

Does Severe Arthritis on an X-Ray Automatically Mean Knee Replacement?

No.

An X-ray is an important part of the evaluation, but it is only one part.

Two people may have very similar-looking X-rays but completely different symptoms.

One person may still walk comfortably and perform most activities, while another may experience severe daily pain and major limitations.

Therefore, the decision usually considers:

Symptoms + examination + X-rays + functional limitation + response to previous treatment + patient expectations.

The purpose is not to operate on an X-ray. It is to treat the person whose knee problem is significantly affecting their life.

Is Knee Replacement an Emergency Surgery?

In most patients, knee replacement is a planned or elective procedure.

This is an advantage because it gives both the patient and medical team time to optimise health before surgery.

There can be unusual circumstances—such as certain fractures, severe structural problems or complications—where treatment needs to happen differently or more urgently.

For most patients with arthritis, however, knee replacement can be carefully planned.

Preparing Your Body Before Knee Replacement

One of the most important parts of successful knee replacement actually happens before entering the operating theatre.

The healthier and better prepared a patient is before surgery, the better positioned they are for recovery.

1. Control Diabetes Before Surgery

Patients with diabetes should work with their treating doctors to ensure their blood glucose is adequately controlled.

Poorly controlled diabetes may increase problems with:

• Wound healing
• Infection
• Recovery after surgery

Your surgical and medical teams may therefore check blood sugar levels and other markers before proceeding.

Do not change diabetes medication without discussing it with your doctor.

2. Make Sure Blood Pressure Is Controlled

High blood pressure should be appropriately managed before surgery.

Patients already taking blood-pressure medication should discuss with their medical team which medications should be continued or adjusted around the time of surgery.

3. Check Thyroid and Other Medical Conditions

Known medical conditions such as thyroid disorders should also be appropriately controlled.

Your preoperative assessment may include blood tests and other investigations depending on your age and health.

4. Heart Health Should Be Assessed When Necessary

Patients with a history of:

• Heart disease
• Previous angioplasty or stent
• Heart attack
• Heart failure
• Irregular heartbeat
• Significant breathlessness
• Other cardiovascular conditions

may require additional evaluation before surgery.

A medical or cardiac review does not automatically mean surgery cannot be performed. It helps the medical team understand and reduce potential risks.

5. Stop Smoking

Smoking can interfere with blood supply and wound healing and may increase surgical complications.

Patients who smoke should ideally discuss stopping well before the operation.

Even reducing and stopping smoking around surgery can be beneficial, but the earlier cessation occurs, the better.

Nutrition Before Knee Replacement

Nutrition is sometimes overlooked during preparation for surgery.

The body needs adequate nutrition to:

• Heal wounds
• Maintain muscle
• Support rehabilitation
• Recover from the physiological stress of surgery

Protein is particularly important.

Depending on your medical condition, your diet may include appropriate sources such as:

• Eggs
• Milk or curd
• Paneer
• Lentils
• Dal
• Beans
• Fish
• Chicken
• Other protein-rich foods

Patients with kidney disease or other conditions that affect dietary requirements should consult their physician or dietitian before substantially increasing protein intake.

Why Muscle Strength Before Surgery Matters

Knee arthritis often creates a cycle:

Pain → less walking → weaker muscles → greater difficulty walking → still less activity.

By the time some patients undergo surgery, the thigh muscles may already have become significantly weak.

Where medically appropriate, exercises before surgery can help maintain:

• Quadriceps strength
• Hip strength
• Balance
• General conditioning

A stronger patient often finds postoperative rehabilitation easier.

Your orthopaedic surgeon or physiotherapist can recommend appropriate exercises according to the condition of your knee.

What Actually Happens During Knee Replacement?

During total knee replacement, the surgeon removes a controlled amount of damaged bone and cartilage from the surfaces of the knee.

Artificial components are then positioned to recreate the joint surfaces.

A typical knee replacement involves components for the:

Femur

The damaged surface at the lower end of the thigh bone is replaced with a metal component.

Tibia

The upper surface of the shin bone is resurfaced and fitted with a component, usually incorporating metal and a durable medical-grade polyethylene surface.

Patella

The kneecap may or may not require resurfacing depending on the individual knee and the surgeon’s assessment.

The objective is to create a stable, well-aligned knee capable of allowing comfortable everyday movement.

What Is the Best Material for Knee Replacement?

This is one of the most common questions patients ask.

Patients often say:

“Doctor, please use the best implant.”

Others ask:

“Should I choose an imported knee?”

But choosing an implant is more complicated than simply selecting the most expensive or imported option.

Imported Does Not Automatically Mean Better

The country in which an implant is manufactured does not by itself determine whether it is suitable for you.

Factors that matter include:

• Implant design
• Long-term clinical track record
• Published performance data
• Suitability for the patient’s anatomy
• Bone quality
• Age
• Weight
• Activity expectations
• Ligament condition
• Surgeon familiarity with the system

AAOS guidance similarly notes that implant choice depends on patient needs, age, weight, activity level, general health, the surgeon’s experience with the device, cost, and the implant’s performance record.

Ask About Track Record, Not Just Marketing

An implant may sound impressive because it is described as:

“Premium.”

“Imported.”

“Latest generation.”

“Advanced material.”

But a useful question is:

How has this implant performed over time?

For a device intended to remain inside the body for many years, long-term clinical experience matters.

A surgeon may therefore consider whether an implant system has reliable clinical information at:

• 5 years
• 10 years
• 15 years
• Longer follow-up where available

A newer implant is not automatically bad, but “new” does not automatically mean “better” either.

How Long Does a Knee Replacement Last?

There is no single lifespan that applies to every artificial knee.

Knee replacements can function successfully for many years, but longevity depends on several factors including:

• Patient age
• Body weight
• Activity level
• Implant positioning
• Bone quality
• Implant design
• Infection
• Trauma
• Wear over time

Most patients should think of knee replacement as a long-term treatment, while understanding that no artificial joint can be guaranteed to last for the rest of every patient’s life.

Younger patients also have more years in which the implant may eventually wear or loosen, which is one reason timing and expectations should be discussed carefully with the surgeon.

Should You Choose the Implant Before Choosing the Surgeon?

Usually, the better approach is the opposite.

First ensure that:

1. Knee replacement is actually appropriate for you.
2. Your diagnosis is correct.
3. Other reasonable treatment options have been considered.
4. Your surgeon understands your anatomy, health and activity requirements.
5. You understand what surgery can and cannot achieve.

The implant is an important part of surgery, but it is only one component of the overall result.

Setting Realistic Expectations Before Surgery

Patients should understand what knee replacement is designed to achieve.

The primary objectives are:

• Significant reduction in arthritic pain
• Improved mobility
• Better walking ability
• Improved everyday function
• Greater independence

It is unrealistic to expect the artificial knee to feel exactly like the natural knee you had at 20 years of age.

Some patients may occasionally remain aware that they have an artificial joint, particularly during specific movements.

The aim is therefore not a “perfect artificial knee.”

The aim is a comfortable, functional knee that allows you to live your everyday life with much less pain.

Recovery After Knee Replacement

Recovery is gradual rather than instantaneous.

Physiotherapy and regular movement are important parts of recovery. AAOS notes that most patients can return to many normal activities of daily living within approximately 3 to 6 weeks, although recovery varies considerably between individuals.

Immediately After Surgery

Depending on the patient’s condition and surgical protocol, mobilisation generally begins early.

Patients may initially use:

• A walker
• Crutches
• Other walking assistance

The goal is to gradually restore safe movement rather than remain in bed unnecessarily.

The First Few Weeks

Rehabilitation focuses on:

• Knee movement
• Straightening the knee
• Improving knee bending
• Strengthening thigh muscles
• Walking correctly
• Improving balance

Regular exercises play an important role in restoring strength and mobility.

Returning to Everyday Life

The timeline varies depending on:

• Age
• Preoperative strength
• General health
• Whether one or both knees are involved
• Type of surgery
• Progress with physiotherapy
• Home environment
• Other medical conditions

Walking distance typically increases progressively as strength and confidence improve.

What Activities Are Possible After Knee Replacement?

Most patients undergo knee replacement because they want to return to everyday activities without persistent arthritic pain.

Following adequate recovery, appropriate activities may include:

• Regular walking
• Swimming
• Cycling
• Light recreational activities
• Golf
• Low-impact exercise

High-impact activities such as repetitive running and jumping may not be advisable because they can increase stress on the artificial joint.

Always discuss your specific activity goals with your surgeon.

What Are the Possible Risks of Knee Replacement?

Knee replacement is a major surgical procedure, and like every operation, it carries potential risks.

These may include:

• Infection
• Blood clots
• Bleeding
• Stiffness
• Persistent pain
• Wound problems
• Nerve or blood-vessel injury
• Implant loosening or wear
• Instability
• Anaesthesia-related complications
• Need for another operation in the future

Preoperative optimisation, appropriate surgical technique, infection-prevention protocols and postoperative mobilisation are all intended to reduce these risks.

Your individual risk depends on your health, so personal counselling with your orthopaedic surgeon is important.

The Most Important Question Before Knee Replacement

Instead of asking only:

“Which implant should I choose?”

Start by asking:

“Is knee replacement really necessary for me at this stage?”

Once that decision has been made appropriately, you can discuss:

• Which procedure is suitable
• Total versus partial knee replacement if relevant
• Implant design
• Surgical technique
• Robotic assistance where appropriate
• Risks
• Recovery
• Rehabilitation
• Long-term expectations

The goal should always be the right treatment for the right patient at the right time.

Frequently Asked Questions About Knee Replacement

1. At what age should I have knee replacement?

There is no universal “correct age” for knee replacement.

The decision depends more on the severity of arthritis, pain, functional limitation, overall health and response to non-surgical treatment than on age alone.

2. How do I know if I really need knee replacement?

You may need an evaluation when knee pain occurs regularly and begins interfering with walking, stairs, sleep or daily activities despite appropriate non-surgical treatment.

An orthopaedic surgeon can assess your symptoms, examination findings and X-rays before recommending surgery.

3. Should I wait until the pain becomes unbearable?

Not necessarily.

There is no benefit in deliberately waiting until you are completely disabled.

At the same time, surgery should not be performed simply because an X-ray looks severe.

The timing should be based on how much the knee is affecting your life and whether other reasonable treatments are still helping.

4. I can walk only for 10 minutes. Does that mean I need knee replacement?

It may be an important sign of functional limitation, but walking time alone cannot determine whether surgery is required.

The cause of the pain, severity of arthritis, examination, X-rays, medical health and response to previous treatment all need to be considered.

5. Is knee replacement very painful?

Pain after surgery is expected, particularly during the early recovery period.

Modern pain-management strategies aim to make postoperative pain manageable so that patients can begin movement and physiotherapy.

Pain generally improves progressively as the surgical tissues heal.

6. How soon can I walk after knee replacement?

Many patients begin assisted mobilisation soon after surgery, depending on their condition and the surgeon’s protocol.

Initially, a walker or other support may be required.

Walking distance then increases gradually during rehabilitation.

7. How long does full recovery take?

Recovery varies between patients.

Many everyday activities return within several weeks, but improvements in strength, mobility and confidence can continue for several months.

Your surgeon and physiotherapist can give you a more personalised timeline.

8. Can both knees be replaced at the same time?

In selected patients, bilateral knee replacement may be considered.

However, simultaneous surgery is not appropriate for everyone.

Age, general health, heart and lung status, rehabilitation ability and the severity of disease in both knees must be considered carefully.

9. Is an imported knee implant better?

Not necessarily.

A good implant should be selected based on its clinical performance, design, suitability for the patient and the surgeon’s experience—not simply the country where it was manufactured.

10. What is the best knee replacement implant?

There is no single implant that is “best” for every patient.

The appropriate implant depends on:

• Knee anatomy
• Ligament stability
• Bone quality
• Age
• Activity level
• Weight
• Deformity
• Previous surgery
• Surgeon experience

A proven implant with an appropriate design and reliable clinical track record is generally more meaningful than marketing claims.

11. How many years will my knee replacement last?

Modern knee replacements are designed for long-term use and can last many years.

However, implant longevity varies between patients, and no surgeon can guarantee an exact number of years.

Following advice about activity, weight management and routine follow-up can help protect the joint.

12. Can knee replacement fail?

Yes, although most primary knee replacements are successful.

Possible causes of failure include:

• Infection
• Implant loosening
• Wear
• Instability
• Fracture
• Persistent stiffness

When a knee replacement fails significantly, revision knee replacement may sometimes be required.

13. Can I climb stairs after knee replacement?

Yes, many patients are able to use stairs after rehabilitation.

Initially, patients may require assistance or a particular stair-climbing technique until strength and balance improve.

14. Can I drive after knee replacement?

Driving should resume only when you can safely enter the car, comfortably control the knee and react appropriately with the pedals.

AAOS notes that many patients return to driving at approximately 4–6 weeks, although the actual timing depends on which knee was operated on, medication use, strength and individual recovery.

Always obtain clearance from your treating surgeon.

15. Is physiotherapy necessary after knee replacement?

Yes.

Exercise and rehabilitation are important for restoring:

• Movement
• Muscle strength
• Walking
• Balance
• Functional independence

Following the prescribed rehabilitation programme is an important part of achieving a good result.

16. Is robotic knee replacement better than conventional knee replacement?

Robotic technology can assist the surgeon with planning and precise execution of certain aspects of knee replacement.

However, technology does not replace the surgeon’s judgement and experience.

Whether robotic-assisted or conventional knee replacement is most appropriate should be discussed according to your knee anatomy, condition and available treatment options.

17. Can diabetes patients undergo knee replacement?

Yes, many people with diabetes successfully undergo knee replacement.

However, diabetes should be adequately controlled before surgery because poor glucose control may increase the risk of infection and problems with wound healing.

18. Should I lose weight before knee replacement?

If you are significantly overweight, your doctor may recommend weight reduction where practical because excessive body weight can affect mobility, rehabilitation and stress on the joint.

However, decisions should be individualised rather than based on weight alone.

19. What should I ask my surgeon before knee replacement?

Useful questions include:

• Do I really need knee replacement now?
• Are there any non-surgical options still worth trying?
• Do I need total or partial knee replacement?
• What implant will you use and why?
• Does the implant have a good long-term track record?
• What are my individual surgical risks?
• How should I prepare before surgery?
• When will I begin walking?
• How long will physiotherapy be required?
• When can I drive or return to work?
• What activities should I avoid after recovery?

A well-informed patient can enter surgery with much clearer and more realistic expectations.

Final Takeaway

Knee replacement can be a highly effective quality-of-life improving procedure for appropriately selected patients.

But the most important decision is not whether you should choose an expensive implant, an imported implant or the newest technology.

The first question should always be:

“Is knee replacement the appropriate treatment for my knee and my current quality of life?”

If persistent knee pain is restricting your walking, independence and everyday activities despite appropriate treatment, an orthopaedic evaluation can help determine whether knee replacement is appropriate.

Once surgery is chosen, preparing your general health, controlling medical conditions, improving nutrition and muscle strength, choosing a well-established implant and entering surgery with realistic expectations can all contribute to a smoother treatment journey.

Consult Dr. Arun Kannan

Dr. Arun Kannan
MS Ortho (AIIMS), FAOA (AUS), FARS (USA)
Senior Consultant Orthopaedic Surgeon
Knee, Hip & Joint Replacement Surgeon

Apollo Hospitals
Greams Road, Chennai

Jayam Ortho Care
4, 6th Cross Street
United India Colony
Kodambakkam, Chennai – 600024

Appointments:
+91 93604 38720
044-24844718
044-24728875

Email: jayamorthocare@gmail.com

Medical Disclaimer: This article is intended for general educational purposes only. The need for knee replacement, choice of implant, surgical approach and recovery plan vary from patient to patient. Please consult a qualified orthopaedic surgeon for individual diagnosis and treatment recommendations.