Knee Joint Replacement

Overview

Knee replacement (knee arthroplasty) is one of the most successful and commonly performed joint surgeries. In a diseased knee, the smooth cartilage that cushions the ends of the thighbone (femur), shinbone (tibia), and kneecap (patella) wears away, causing bone to rub on bone with pain and stiffness. The surgeon resurfaces the damaged surfaces with metal and plastic implants that recreate a smooth, gliding joint.

Replacement can be total (resurfacing the whole joint) or partial (resurfacing only one damaged compartment). The goal is to relieve pain and restore comfortable movement so people can return to daily activities they had given up.

This page is an educational overview only. It is not medical advice, and no surgical outcome can be guaranteed. Whether knee replacement is right for you can only be decided after evaluation by a qualified orthopaedic surgeon.

Who May Need This

Knee replacement is usually considered for adults with advanced knee arthritis — most often osteoarthritis, but also rheumatoid or post-traumatic arthritis — causing pain and stiffness that limit walking, stairs, sleep, and daily life despite non-surgical treatment. Many candidates have pain at rest or at night, deformity such as bowing of the leg, or a knee that gives way or locks.

Candidacy depends on the severity of joint damage, overall health, weight, and activity goals, not on age alone. Only a surgeon can determine eligibility after a full assessment.

When It May Be Recommended

Surgery is generally recommended when conservative measures no longer control pain or preserve function — after trying weight management, activity changes, physiotherapy, anti-inflammatory medication, and sometimes injections — and when X-rays confirm significant cartilage loss.

The timing is individual. Some people proceed when pain disrupts sleep and independence; others wait. Your surgeon will help weigh the benefits against the risks and the durability of the implant for your age and activity level.

Diagnosis and Evaluation

Evaluation includes a history and physical examination of your knee’s motion, stability, alignment, and gait. Weight-bearing X-rays confirm the pattern and severity of arthritis, and occasionally MRI or CT is used for planning. Your general health, weight, dental health, and any sources of infection are reviewed because they affect the safety of implant surgery.

Blood tests, an ECG, and a medication review help plan anaesthesia and blood-clot prevention. A second opinion can be valuable before deciding.

Treatment Options

Options range from least to most invasive: non-surgical care (weight loss, physiotherapy, bracing, anti-inflammatory medication, and injections); joint-preserving surgery such as arthroscopy or osteotomy (realigning the leg) in selected younger patients; partial knee replacement when damage is confined to one compartment; and total knee replacement for widespread arthritis.

The right choice depends on where and how severe the damage is, your alignment and ligaments, and your goals. Your surgeon will explain which options fit your knee.

How It Is Performed

Knee replacement is performed under general or spinal anaesthesia. Through an incision at the front of the knee, the surgeon removes the worn cartilage and a thin layer of bone from the ends of the femur and tibia, and often resurfaces the back of the kneecap. Precisely shaped metal components are fixed to the bone ends and a plastic spacer is placed between them to allow smooth motion.

The surgeon balances the ligaments and checks alignment and stability through a full range of motion before closing the wound. The procedure commonly takes one to two hours. Some centres offer computer navigation or robotic assistance to help with alignment.

Preparation

Preparation typically includes pre-operative tests, treating any infections (including dental problems), optimising conditions such as diabetes and blood pressure, and reviewing medications — especially blood thinners — with your doctor. Losing excess weight and stopping smoking improve safety and recovery.

Arrange home help, a walker or crutches, and prepare your living space to reduce fall risk. If travelling abroad, allow for the recommended in-country stay for surgery and early rehabilitation, and bring your imaging and records.

Benefits and Expected Goals

The main goals are reliable pain relief, improved mobility, and better quality of life — walking farther, climbing stairs, and sleeping without arthritis pain. Most appropriately selected patients experience substantial improvement.

Benefits vary by individual, and the result depends on committed physiotherapy. A replacement is an artificial joint, so while it can transform comfort and function, it may not feel exactly like a natural knee, and high-impact activities are generally limited to protect it.

Risks and Possible Complications

Knee replacement is generally safe, but as major surgery it carries risks.

• Infection, which can be serious and occasionally require further surgery
• Blood clots in the leg (deep vein thrombosis) or lung (pulmonary embolism)
• Implant loosening or wear over time, potentially needing revision
• Stiffness or limited motion (sometimes requiring manipulation)
• Nerve or blood-vessel injury, or numbness around the scar
• Persistent pain, fracture, or instability

Your surgeon will explain the risks specific to your health. Report fever, increasing redness, wound drainage, or calf swelling promptly.

Recovery, Follow-up & Aftercare

Recovery varies by patient. Early movement and physiotherapy begin soon after surgery to restore motion and strength; walking aids are used at first and gradually discarded. Many people manage stairs and basic daily tasks within a few weeks, with continued improvement over months.

Blood-clot prevention, wound care, and a structured exercise programme are essential. Attend follow-up appointments and periodic X-rays. Arrange rehabilitation and monitoring with your local doctor before travelling home, and follow activity guidance to protect the implant.

Medical Tourism Planning

If you are considering knee replacement abroad, choose a JCI- or ISO-accredited hospital with a high-volume joint-replacement programme. Confirm the surgeon’s experience and ask about implant options, infection rates, and how complications and follow-up are handled.

Plan for the in-country stay your team recommends for surgery and early rehabilitation, and confirm your fitness to fly afterwards, as long flights can raise clot risk. Arrange ongoing physiotherapy and follow-up at home, consider medical travel insurance, and request a written treatment plan and cost estimate before you travel.

Estimated Cost Factors

The cost of knee replacement depends on the country and hospital, surgeon’s fees, the implant system (and whether robotic assistance is used), anaesthesia, length of stay, physiotherapy, and whether one or both knees are treated. Complications or additional procedures add to the total.

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

Choosing a Hospital or Specialist

Look for recognised accreditation (JCI, ISO, or a strong national equivalent) and a dedicated joint-replacement unit performing high volumes with good outcomes. Confirm the surgeon’s board certification and experience, and ask about the implants used and the hospital’s infection-prevention measures.

Ask about international patient services, interpreter support, physiotherapy facilities, and the follow-up plan. Transparent written cost and treatment plans and clear communication are signs of a quality programme.

Alternatives

Alternatives depend on severity. They include non-surgical management (weight loss, physiotherapy, bracing, medication, injections), joint-preserving surgery such as osteotomy for younger patients with localised damage, and partial knee replacement when only one compartment is affected.

Each option has different benefits, risks, and recovery. Discuss all of them with your surgeon so the plan fits your knee, activity level, and goals.

Questions to Ask Your Doctor

• Do I need a total or partial knee replacement, and why?
• How many knee replacements do you perform each year, and what are your outcomes?
• Which implant would you use, and how long is it expected to last?
• What are the specific risks in my case, and how do you prevent infection and clots?
• What does rehabilitation involve, and how long should I stay in-country?
• When can I safely fly home after surgery?
• What is included in the written cost estimate?