Knee replacement,
explained without pressure.
Considered when pain and stiffness stop responding to other treatment and start limiting everyday life. This guide covers what the procedure involves, who it suits, and what recovery asks of you.
What a knee replacement actually is
In a knee replacement, the damaged surfaces of the knee joint are removed and replaced with implant components designed to restore smoother movement. The aim is to reduce pain and improve function — not to recreate a young, uninjured knee.
A total knee replacement resurfaces the whole joint. A partial (unicompartmental) replacement addresses only the affected compartment and preserves more of your own knee, but it suits a narrower group of people. Which is appropriate depends on the pattern of wear, ligament condition, alignment and your own goals — decided together after examination and imaging.
Imaging shows structural change. It does not measure how far you can walk, how well you sleep, or what you have stopped doing. The decision sits at the meeting point of both.
Is a knee replacement conversation right for me?
The question is rarely “is my knee bad enough?” It is closer to “has this changed my life enough, and have the reasonable alternatives been tried?” The two lists below are a starting point for that discussion — not a diagnosis.
Worth discussing if
- Knee pain persists at rest or wakes you at night
- Walking distance has shortened noticeably over months or years
- Stairs, squatting, or getting out of a chair have become difficult
- Painkillers, physiotherapy, weight management or injections no longer give useful relief
- The knee gives way, locks, or has become visibly bowed or knock-kneed
- You are avoiding work, travel or activities you value
Usually explore other steps first if
- Symptoms are recent and have not been assessed yet
- Structured physiotherapy has not been properly tried
- Pain is mainly mechanical and intermittent, with good function between episodes
- An active infection, unstable medical condition or unhealed wound is present
- Support at home for the recovery period is not yet arranged
- Your main goal is a return to high-impact sport rather than pain relief
Conditions that may lead to this discussion
Knee replacement is most often considered where joint surfaces have been progressively damaged. The underlying cause shapes the plan, so the diagnosis is established before any treatment decision.
Age, activity level, other joints, general health and personal priorities all change what is appropriate. This is why the same X-ray finding does not lead to the same recommendation.
Non-surgical options come first
Surgery is one option in a sequence, not the default. In most cases, conservative treatment is explored and reviewed before a replacement is considered. The table sets out how the paths differ.
| Consideration | Non-surgical care | Knee replacement |
|---|---|---|
| What it involves | Physiotherapy, activity modification, weight management, medication, walking aids, selected injections | Surgical resurfacing of the damaged joint with implant components |
| Best suited to | Early to moderate change, symptoms that still respond, good function between flare-ups | Advanced change with persistent pain and daily limitation despite conservative care |
| Effect on pain | Often reduces symptoms; does not reverse structural damage | Aims to address the source of mechanical pain directly |
| Recovery demand | Ongoing effort, low disruption to daily life | Hospital stay, protected early period, structured rehabilitation |
| Reversibility | Fully reversible; can be revisited at any point | Permanent change to the joint; revision surgery is possible but more complex |
| When to review | If symptoms worsen or function declines further | Planned follow-up reviews after surgery |
For most people, a knee replacement is a planned decision rather than an urgent one. Ask what would change if you waited six months, and what signs would suggest revisiting sooner.
What happens, step by step
Knowing the sequence removes a lot of the anxiety. The details of your own procedure are confirmed in the pre-operative consultation, where anaesthesia, implant choice and recovery plan are discussed with you.
Assessment & planning
History, examination and imaging establish the pattern of damage, alignment and ligament condition. Fitness for anaesthesia is reviewed and the implant approach is planned before the day of surgery.
Anaesthesia
Spinal or general anaesthesia is used depending on your health and the anaesthetist’s assessment. Pain control for the hours after surgery is planned at the same time.
Resurfacing the joint
The damaged surfaces are removed precisely and prepared to accept the implant. Alignment and soft-tissue balance are checked throughout, since both affect how the knee feels afterwards.
Implant placement
Components are positioned and secured, and movement and stability are tested before closure. Implant type is selected for your anatomy and activity needs.
Immediate recovery
Pain relief, wound care and clot-prevention measures begin straight away. Guided movement is usually started early, under supervision.
Rehabilitation begins
Physiotherapy starts before you go home and continues afterwards. This part is not optional — the outcome depends heavily on it.
Recovery is a sequence, not a single date
Progress varies between individuals, and your own timeline is set by your surgeon and physiotherapist. The stages below describe the shape of a typical recovery so you know what is being worked towards.
Pain control and first movement
Pain relief is established, the wound is monitored, and supervised movement and walking with support usually begin early. You are shown the exercises to continue at home.
Protect, move, repeat
Wound care, clot prevention and daily exercises are the priorities. Walking aids are used as advised and reduced gradually. Swelling and discomfort are expected and are managed rather than pushed through.
Regaining range and strength
Physiotherapy focuses on bend, straightening and quadriceps strength. Most people gradually resume light household activity and short outdoor walks in this phase.
Return to routine
Walking distance, stairs and confidence improve. Return to work depends on the demands of your job and is discussed individually. Driving is resumed only when your clinician confirms it is safe.
Consolidation and review
Strength and comfort continue to improve for a considerable period after surgery. Planned reviews check implant position, function and any concerns.
Fever, increasing redness or discharge from the wound, calf pain or swelling, chest pain or breathlessness, or a sudden change in the knee’s stability should be reported without waiting for the next scheduled review.
Honest expectations
Knee replacement is a well-established procedure, and most people who have it report meaningful improvement in pain and function. It is still major surgery, and a full consent conversation covers the risks that apply to you specifically.
Possible complications discussed before surgery
These are not expected outcomes. They are the recognised risks that any surgeon should discuss with you before you consent.
- Infection of the wound or joint
- Blood clots in the leg or lung
- Stiffness or restricted range of movement
- Ongoing pain or altered sensation around the knee
- Implant loosening or wear over time
- Nerve or blood vessel injury
- Anaesthetic and general medical risks
- Need for revision surgery in the future
It is designed for comfortable walking, stairs, work and everyday activity. High-impact running, jumping and deep kneeling are generally discouraged, since they shorten implant life. Some people notice clicking or a sense of the knee feeling “different”; this is common and not usually a problem.
Preparing well makes recovery easier
Much of what determines a smooth recovery happens before the day of surgery. These are the practical steps usually discussed in the pre-operative consultation.
Before surgery
- Complete the pre-operative tests and medical clearance requested.
- List every medicine and supplement you take — some need to be paused, and this must be confirmed by your clinician.
- Stop smoking if you can; it affects wound healing.
- Begin the strengthening exercises your physiotherapist advises.
- Treat any dental or skin infection beforehand.
- Arrange help at home and confirm who will accompany you.
Set up your home
- Clear walkways; remove loose rugs and trailing cables.
- Keep daily items within easy reach, at waist height.
- Arrange a firm chair with armrests and a bed you can get in and out of easily.
- Consider a raised toilet seat and a bathroom grab rail.
- Prepare and freeze meals in advance.
- Plan how you will travel to physiotherapy sessions.
Which type of replacement suits my knee, and why? What are my non-surgical options right now? What does recovery ask of me realistically? What happens if I wait? What would make you advise against surgery in my case?
Cost, insurance and what to ask
Surgical costs depend on the hospital, the type of implant, the room category, the length of stay and your insurance arrangement. A written estimate is provided by the hospital before you proceed, and it is reasonable to ask for it early.
Ask the hospital billing team for a written surgical estimate covering implant, theatre, stay, physiotherapy and follow-up. If you have insurance, confirm cashless approval, room-rent limits and implant coverage in advance — these are the most common causes of unexpected bills.
Frequently asked questions
How do I know if I actually need a knee replacement?
Is the surgery painful?
How long will I be in hospital?
When can I walk again?
How long does a knee implant last?
Will I be able to sit cross-legged or squat?
Can both knees be done at the same time?
Is physiotherapy really necessary?
When can I drive again?
What if I decide not to have surgery?
Your surgeon
Dr. Kapil Khare
Consultant Orthopaedic Surgeon & Joint Replacement Specialist
Practising at Fortis Hospital, Greater Noida, with a focus on joint replacement, arthroscopy and sports injury care. Consultations are structured around understanding your symptoms and goals before any treatment decision is made.
Next step
Bring your question to a considered consultation.
A consultation is not a commitment to surgery. It is a way to understand what is causing your symptoms, which options are reasonable now, and what each one would ask of you.