Knee replacement has one of the highest satisfaction rates of any operation, with the large majority of patients reporting substantial pain relief. It is also a major procedure with a demanding rehabilitation, and doing it too early or too late both produce worse results.
The question is rarely whether it works. It is whether you have reached the point where it is the right answer.
What Is Actually Being Replaced
The name suggests the whole knee is removed, which alarms patients unnecessarily. In fact only the damaged surfaces are resurfaced.
In osteoarthritis, the cartilage covering the ends of the thigh bone and shin bone wears away until bone rubs on bone, which is what causes the pain. Total knee replacement removes a few millimetres of that worn surface and caps it with metal components, with a plastic bearing between them.
The ligaments, the muscles and most of the bone remain. That is why patients can walk, climb stairs and squat to a degree afterwards.
Who Benefits Most
Surgery works best when specific criteria are met, and these are worth being honest about.
- Pain that is present at rest and at night, not just on walking
- Significant restriction of daily activities: walking distance, stairs, getting up from a chair
- X ray evidence of advanced joint space loss
- Failure of at least several months of proper non surgical treatment
- Deformity, such as the knees bowing outward
- Pain that has stopped responding to painkillers, or requires them daily
The key phrase is night pain. Pain that wakes you is the most reliable indicator that the joint has reached the end of conservative management.
What to Try First
Many patients arrive having tried only painkillers. Several measures have genuine evidence and should be exhausted first.
- Weight reduction: each kilogram lost removes roughly four kilograms of load from the knee when walking. This is the most powerful single measure
- Quadriceps strengthening: a strong thigh muscle offloads the joint substantially, and this is consistently underdone
- Physiotherapy: supervised, structured, and continued rather than a few sessions
- Walking aids: a stick in the opposite hand reduces knee load meaningfully and is refused by most patients out of pride
- Appropriate footwear with cushioning
- Steroid injections for flares, though repeated injections are limited
- Activity modification: swimming and cycling rather than stairs and squatting
Our physiotherapy department runs structured programmes that delay or occasionally avoid surgery altogether.
The Timing Question
Both extremes cause problems.
Too early means undergoing a major operation for pain that non surgical measures could still control, and consuming the lifespan of an implant that will need revision later. Implants last around fifteen to twenty years, so replacing a knee at fifty makes a second operation likely.
Too late means years of reduced activity, muscle wasting and weight gain from inactivity, plus severe deformity that makes surgery technically harder. Patients who arrive very deconditioned recover more slowly and less completely.
The right time is when pain and restriction dominate your daily life despite proper conservative treatment, regardless of your age.
Partial Versus Total Replacement
Arthritis sometimes affects only one compartment of the knee, usually the inner side.
Where the damage is confined, a partial replacement resurfaces only that compartment. It preserves more bone and ligaments, gives a more natural feeling knee, and recovers faster.
It is suitable for a minority of patients, requiring intact ligaments and disease limited to one compartment. Ask whether you are a candidate, since it is not always offered.
The Recovery Timeline, Honestly
Patients are frequently told recovery takes six weeks. That is when you walk unaided, not when you have recovered.
- Day 1: standing and taking a few steps with a walker
- Days 2 to 4: walking further, practising stairs, usually discharge around day three to five
- Weeks 1 to 2: walker at home, daily exercises, swelling and disturbed sleep are usual
- Weeks 3 to 6: progressing to a stick, bending toward ninety degrees, driving around six weeks
- Months 2 to 3: walking unaided, most daily activities restored
- Months 3 to 6: continued improvement in strength and confidence
- Up to 12 months: final result, with swelling and stiffness settling gradually
The first fortnight is genuinely hard. Pain, swelling and poor sleep are normal, and patients who expect this cope far better than those told it would be easy.
Physiotherapy Determines Your Result
This is the single most important thing to understand. The surgeon provides the opportunity, the rehabilitation determines the outcome.
Bending achieved in the first six weeks largely determines your final range of movement. Stiffness that sets in during that window is difficult to reverse, and occasionally requires a further procedure under anaesthetic to break down adhesions.
Exercises must be done several times daily, and they will be uncomfortable. Patients who do them consistently get a good knee. Patients who avoid them because of pain get a stiff one, and no surgical technique compensates for that.
What You Can and Cannot Do Afterwards
Realistic expectations prevent disappointment.
Expect to: walk without pain, climb stairs, cycle, swim, travel, and return to work including most desk and light manual jobs.
Expect limitations: deep squatting and sitting cross legged are difficult for many patients, kneeling is often uncomfortable, and running and jumping sports are discouraged as they wear the implant.
The squatting and floor sitting point matters particularly in India, where it affects toilet use and religious practice. Discuss this specifically with your surgeon before deciding, since it is a genuine consideration in daily life.
A degree of numbness on the outer side of the scar is permanent and normal. Some clicking is also normal.
Risks Worth Knowing
Complications are uncommon but real, and you should know what to watch for.
- Infection: uncommon but serious, and the reason for antibiotics and sterile precautions. Report increasing redness, discharge or fever
- Blood clots: reduced by early mobilisation and blood thinning medication. Report calf pain or breathlessness urgently
- Stiffness from inadequate rehabilitation
- Persistent pain in a minority despite a technically good replacement
- Loosening over time, requiring revision surgery
Tell any dentist or surgeon that you have a joint replacement, as antibiotic cover is sometimes advised for procedures.
Knee replacement reliably relieves pain in the right patient at the right time. Before agreeing to it, make sure you have genuinely tried weight reduction and quadriceps strengthening, and afterwards commit to the physiotherapy, which matters more than any other single factor.
Our joint replacement service at T. Nagar assesses patients for surgery, and Dr. Mani Ramesh sees knee referrals.
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