Knee replacement surgery in Australia is performed on more than 60,000 patients every year, making it one of the most common elective surgical procedures in the country. For many people, it represents the end of years of pain, limited mobility, and declining quality of life.
For others, the prospect of major surgery is daunting enough to delay the decision far longer than necessary.
Understanding what the procedure actually involves, what recovery looks like, and what outcomes are realistic can help you make a more informed decision and approach the process with clearer expectations.
The Australian Orthopaedic Association maintains a national joint replacement registry that tracks outcomes for all knee replacements performed in Australia, making it one of the most data-rich surgical datasets in the world.
When Knee Replacement Is Actually Recommended
Knee replacement is not the first line of treatment for knee pain or arthritis. It is typically considered when conservative management has been exhausted and symptoms are significantly affecting daily life.
Your orthopaedic surgeon will generally recommend considering knee replacement when you have severe knee pain that limits everyday activities like walking, climbing stairs, or getting in and out of a chair.
They may also suggest it when the pain persists at rest or during the night, when there is significant stiffness and a reduced range of motion, and when X-rays show advanced joint damage.
In addition, knee replacement may be considered when non-surgical treatments, including physiotherapy, weight management, anti-inflammatory medications, and injections, have not provided adequate relief.
Osteoarthritis is the most common reason for knee replacement in Australia. Rheumatoid arthritis, post-traumatic arthritis following injury, and other joint conditions can also lead to the need for replacement.
Total vs Partial Knee Replacement
There are two main types of knee replacement and understanding the difference matters for setting expectations.
A total knee replacement involves resurfacing all three compartments of the knee joint, replacing the ends of the femur and tibia with metal components and inserting a plastic spacer between them to create a smooth gliding surface.
The undersurface of the kneecap may also be resurfaced. Total knee replacement is the more common procedure and is appropriate when arthritis affects the whole joint.
A partial knee replacement, also called a unicompartmental replacement, resurfaces only the affected compartment of the knee. It involves a smaller incision, less bone removal, and typically a faster recovery.
It is suitable for a smaller group of patients whose arthritis is confined to one part of the joint and who meet specific criteria.
Your surgeon will recommend the most appropriate option based on the pattern of your arthritis, your age, activity level, and overall health.
What Happens on the Day of Surgery
Knee replacement is performed under general or spinal anaesthesia, and the procedure itself typically takes between one and two hours.
You will be asked to fast from midnight the night before your surgery. On arrival at the hospital, you will be assessed by the anaesthetist and nursing staff, and a cannula will be placed in your arm for medications and fluids.
During the surgery, the damaged surfaces of the knee joint are removed and the prosthetic components are precisely fitted and fixed to the bone, either using bone cement or a cementless press-fit technique. The joint capsule and surrounding tissues are then closed in layers.
Most patients spend between three and five days in hospital following a knee replacement, though rapid recovery programs at some centres have reduced this to one to two days for suitable patients.
What Recovery Actually Looks Like
Recovery from knee replacement is a gradual process that requires active participation from the patient. The surgery is the straightforward part. The rehabilitation is where outcomes are determined.
In the first few days after surgery, physiotherapists will have you standing and taking steps with a frame or crutches. Early movement is important for reducing the risk of blood clots and maintaining joint mobility. Pain is managed with a combination of medications and is typically well-controlled.
By the time you go home, you should be able to walk with a frame or crutches, manage stairs with assistance, and perform basic self-care. You will be given a home exercise program to continue your rehabilitation.
Most people walk without aids by six weeks. Return to driving is typically between six and eight weeks for the right leg, depending on your surgeon’s guidance. By three months, most patients are significantly more comfortable than before surgery and can manage most daily activities. Full recovery and the final outcome of the surgery can take up to twelve months.
Physiotherapy Australia provides guidance on post-surgical rehabilitation and can help you find a physiotherapist experienced in knee replacement recovery.
Risks and Complications to Be Aware Of
Knee replacement is a safe and well-established procedure, but like all major surgery it carries risks. Being aware of them does not mean they are likely. It means you can recognise early warning signs if they occur.
The most significant risks include deep vein thrombosis and pulmonary embolism, which is why blood-thinning medication and compression stockings are used routinely after surgery. Infection is a serious complication that can occur in the joint itself and may require further surgery.
Stiffness can occur if rehabilitation is not pursued diligently. Implant loosening or wear can require revision surgery over time, more commonly in younger and more active patients.
The Australian Orthopaedic Association National Joint Replacement Registry data shows that approximately 95 percent of knee replacements are still functioning well at ten years.
Conclusion
Knee replacement surgery in Australia delivers life-changing results for the right patients when performed by experienced surgeons and followed by committed rehabilitation. It is not a decision to make lightly or to delay unnecessarily once the indication is clear.
If you are considering knee replacement or have been referred for a surgical opinion, preparation and good information are your best assets.
FAQs
1. Is knee replacement surgery covered by Medicare in Australia?
Medicare covers the surgical fee component of knee replacement. However, if the procedure is performed in a private hospital, out-of-pocket costs for hospital stay, anaesthesia, and prosthesis may apply depending on your private health insurance cover. Public hospital waiting times vary by state.
2. How long does a knee replacement last in Australia?
Modern knee replacements are designed to last 15 to 20 years or more. The Australian registry data shows approximately 95 percent of implants are still functioning at ten years. Younger, heavier, and more active patients tend to place greater demands on implants and may require revision surgery sooner.
3. Can both knees be replaced at the same time?
Bilateral simultaneous knee replacement is performed in some cases but carries higher risk than staged procedures. Most surgeons and anaesthetists prefer to replace one knee at a time with several months between operations, particularly in older patients or those with medical comorbidities.
4. Will I be able to return to sport after knee replacement?
Most patients can return to low-impact activities like walking, cycling, swimming, and golf. High-impact activities including running and contact sports are generally not recommended after total knee replacement due to the increased wear on the implant.
5. What can I do to prepare for knee replacement surgery?
Strengthening the muscles around the knee before surgery, achieving a healthy weight where possible, stopping smoking, and arranging home modifications for your recovery period all improve outcomes.