Knee Replacement Surgery

Overview

Knee replacement (knee arthroplasty) is surgery that resurfaces a knee joint damaged by arthritis or injury with artificial components made of metal and durable plastic. It relieves pain and restores movement when the cartilage that cushions the joint has worn away, leaving bone rubbing on bone.

The operation may be a total knee replacement, resurfacing the whole joint, or a partial (unicompartmental) replacement when arthritis affects only one part of the knee. It is one of the most successful and commonly performed orthopaedic operations for advanced arthritis.

Rehabilitation is a central part of the process, and results depend heavily on physiotherapy and patient effort. This page is an educational overview only — it is not medical advice, and no outcome can be guaranteed.

Who May Need This

Knee replacement may be considered for people with severe knee arthritis — most often osteoarthritis, but also rheumatoid or post-injury arthritis — causing pain that limits walking, stairs, sleep, and daily life, and stiffness or deformity that has not responded to non-surgical treatment.

Candidates are usually those whose quality of life is significantly affected despite medication, physiotherapy, weight management, and injections. Suitability depends on the severity of joint damage on imaging, symptoms, and overall health, and is assessed by an orthopaedic surgeon.

When It May Be Recommended

Surgery is generally recommended when non-surgical measures no longer control pain and the arthritis substantially limits daily activities and quality of life. Persistent night pain, difficulty walking short distances, and loss of independence are common triggers for considering replacement.

The timing is individual: it balances the benefits of pain relief and improved function against the risks of surgery and the finite lifespan of an implant. The final recommendation depends on your symptoms, imaging, age, and health.

Diagnosis and Evaluation

Evaluation includes a history of your symptoms and an examination of the knee's movement, stability, and alignment, along with X-rays that show the extent of arthritis and joint-space loss. Sometimes additional imaging such as MRI is used, and other causes of knee pain are excluded.

Before surgery, your general health, weight, and any conditions such as diabetes are assessed, and your medications — especially blood thinners — are reviewed. Dental and skin checks and clot-risk assessment are part of planning for a safe operation and recovery.

Treatment Options

Non-surgical options are tried first and include weight management, exercise and physiotherapy, pain-relieving and anti-inflammatory medication, walking aids, and injections such as corticosteroids. These can control symptoms for a time but do not reverse established arthritis.

Surgical options include partial or total knee replacement, and, in younger patients or specific situations, joint-preserving procedures such as osteotomy (realigning the bone). The choice depends on the pattern and severity of arthritis, your age and activity, and your goals. Your surgeon will explain which approach fits your knee.

How It Is Performed

Knee replacement is performed under general or spinal anaesthesia. The surgeon opens the front of the knee, removes the worn cartilage and a small amount of bone from the ends of the thigh bone and shin bone, and fits precisely shaped metal components, with a plastic spacer between them to allow smooth movement. The kneecap surface may also be resurfaced.

In a partial replacement, only the damaged compartment is resurfaced through a smaller incision. Computer navigation or robotic assistance is used in some centres to aid alignment. The operation commonly takes one to two hours, after which recovery and physiotherapy begin promptly.

Preparation

Preparation includes optimising your health and weight, treating any infection, reviewing medications — especially blood thinners — with your doctor, and following fasting instructions before anaesthesia. Pre-operative physiotherapy and education (sometimes called "prehabilitation") help recovery.

Arrange help at home and prepare for using walking aids and doing daily exercises. If travelling abroad, plan an adequate in-country stay for early rehabilitation before flying, bring your imaging and records, and confirm the physiotherapy and follow-up plan with the treating team.

Benefits and Expected Goals

The goals of knee replacement are to relieve arthritis pain, improve movement and stability, and restore the ability to walk and carry out daily activities. Most people experience substantial, lasting pain relief and improved function when they engage fully in rehabilitation.

Benefits vary by individual, and some stiffness or occasional discomfort may remain; high-impact sports are generally discouraged to protect the implant. The replacement has a finite lifespan and may eventually need revision. Your surgeon can discuss realistic goals for your knee.

Risks and Possible Complications

Knee replacement is major surgery and carries real risks.

• Blood clots in the legs or lungs, which require preventive measures
• Infection of the wound or the joint, occasionally needing further surgery
• Stiffness, ongoing pain, or reduced range of movement
• Injury to nerves or blood vessels, and wound-healing problems
• Loosening, wear, or instability of the implant over time, possibly needing revision

Your surgeon will explain the risks that apply to you. Report calf pain or swelling, chest pain or breathlessness, fever, a hot or draining wound, or severe worsening pain promptly.

Recovery, Follow-up & Aftercare

Recovery is active and gradual. Many people walk with support within a day of surgery and progress with physiotherapy over several weeks, which is essential for regaining movement and strength. Return to most daily activities often takes about six weeks, with continued improvement over several months.

Aftercare includes wound care, clot-prevention measures, pain management, and a structured exercise programme. Attend follow-up so the surgeon can check progress and the implant. Arrange ongoing physiotherapy and follow-up before travelling home, and report warning signs promptly.

Medical Tourism Planning

Knee replacement is one of the most common procedures for planned medical travel. Choose a JCI- or ISO-accredited hospital with an experienced orthopaedic programme, quality implants, and strong physiotherapy services, and verify the surgeon's experience and case volume.

Because early rehabilitation is so important, plan an adequate in-country stay before flying home, following advice on when air travel is safe given clot risk. Request a written treatment plan and cost estimate, arrange continuing physiotherapy and follow-up at home, and consider medical travel insurance.

Estimated Cost Factors

The cost of knee replacement depends on the country and hospital, the surgeon's and anaesthetist's fees, the type of implant and whether partial or total, whether computer or robotic assistance is used, hospital stay, physiotherapy, and any pre-operative tests. Revision surgery, if ever needed, is a separate cost.

Many international destinations offer joint replacement at a fraction of typical US prices, but figures vary widely by case. Prices quoted online are only estimates — always request a personalized written quote for your specific situation before deciding.

Choosing a Hospital or Specialist

Look for a hospital with recognised accreditation (JCI, ISO, or a strong national equivalent) and a dedicated orthopaedic (joint replacement) programme with good infection-control and physiotherapy services. Confirm the surgeon's board certification, experience, and the quality of the implants used.

Ask about international patient services, interpreter support, rehabilitation arrangements, and how complications and follow-up would be handled. Transparent, written cost and treatment plans and good patient feedback indicate a quality programme.

Alternatives

Alternatives to replacement include weight management, exercise and physiotherapy, medication, walking aids, and injections, which can manage symptoms in earlier arthritis. For some patients, joint-preserving surgery such as osteotomy or, in limited disease, arthroscopic procedures may be options, though arthroscopy has limited value for established arthritis.

Each option has different benefits and durability. Discuss all of them with your surgeon so the plan fits the severity of your arthritis, your age and activity, and your goals.

Questions to Ask Your Doctor

• Is my arthritis severe enough to justify replacement, and would partial or total be better?
• How long is the implant likely to last given my age and activity?
• What are the specific risks in my case, and what clot-prevention measures will you use?
• What does rehabilitation involve, and how much recovery time should I plan?
• What activities will I be able to return to?
• How long should I stay in-country, and when can I safely fly home?
• What is included in the written cost estimate?