A knee that hurts with every stair, walk to the MRT, or turn in bed can gradually shrink a person’s world. When medication, physiotherapy and activity adjustments no longer provide meaningful relief, robotic knee replacement may be discussed as one option for treating advanced knee arthritis. It is not a shortcut to surgery, nor does it replace the surgeon’s judgement. It is a technology that can help plan and carry out a joint replacement with greater individualisation.
For many patients, the real question is not whether a robot is involved. It is whether knee replacement is appropriate now, what outcome is realistic, and what is needed to return safely to work, family responsibilities, exercise and daily life.
What is robotic knee replacement?
Robotic knee replacement is a form of knee replacement surgery that uses computer-assisted technology to help the orthopaedic surgeon plan bone preparation and implant positioning. Before surgery, imaging and detailed measurements are used to build a three-dimensional model of the knee. During the procedure, the system provides real-time information about the knee’s shape, alignment and soft-tissue balance.
The surgeon remains in control throughout. The robotic system does not perform surgery independently. Instead, it helps the surgeon make planned bone cuts within defined boundaries and assess how the new joint is likely to move through its range of motion.
This can be useful because no two arthritic knees are identical. Some patients have bow-legged or knock-kneed alignment, previous injuries, old fractures, stiffness, or changes in ligament balance. Robotic assistance allows planning to be tailored more closely to the individual knee rather than relying solely on standard measurements.
When is a robotic knee replacement considered?
Knee replacement is usually considered for severe osteoarthritis, and occasionally other forms of arthritis, when pain and loss of function persist despite appropriate non-surgical treatment. An X-ray may show worn joint space, bone spurs and changes in alignment, but scans are only one part of the assessment. The effect on your life matters just as much.
You may be a candidate if knee pain is limiting walking, sleep, work or recreational activity; if the knee repeatedly swells or gives way; or if you can no longer manage stairs and everyday tasks comfortably. Some patients are active and wish to maintain low-impact sport such as cycling, swimming, golf or gym training. Others simply want to walk without planning every step around pain.
Surgery is not automatically the first answer. Weight management where appropriate, activity modification, pain relief, targeted physiotherapy, injections in selected cases and bracing may all have a role. These measures do not reverse established arthritis, but they can reduce symptoms and delay or avoid surgery for some people.
The decision depends on the severity of symptoms, the condition of the joint, your general health, expectations and response to conservative treatment. Age alone is not the deciding factor. A younger, highly active person may need a different conversation about implant longevity and future revision surgery than an older person with severe pain and low activity demands.
How robotic planning may help
The potential value of robotic assistance lies in planning and execution. It can help the surgeon assess the knee before bone cuts are made, including limb alignment, areas of cartilage loss and the tension in surrounding ligaments. The plan can then be adjusted during surgery according to the actual state of the knee.
Accurate component positioning and balanced soft tissues are goals in every knee replacement, whether performed with conventional instruments or robotic assistance. A well-balanced knee is intended to feel stable through bending and straightening, while avoiding excessive tightness or looseness.
However, robotic technology does not guarantee a pain-free knee or a perfect result. Recovery is influenced by factors beyond implant position, including muscle strength, pre-existing stiffness, pain sensitivity, medical conditions, commitment to rehabilitation and complications such as infection or blood clots. The experience and judgement of the surgical team, together with a well-managed rehabilitation programme, remain central to the outcome.
For this reason, patients should be wary of claims that any one technique is best for everyone. Robotic assistance may be particularly helpful in complex anatomy or when a highly personalised plan is desired, but the most suitable approach should follow a proper clinical assessment.
Intra-op Planning during Robotic TKR
What happens before and during surgery?
A specialist consultation begins with a detailed history and examination. The pattern of pain, walking tolerance, range of movement, stability and leg alignment are assessed. Standing X-rays are commonly used to evaluate arthritis and the overall mechanical alignment of the leg. Further imaging may be needed in selected situations.
If robotic surgery is appropriate, pre-operative planning is performed using the imaging and measurements required by the particular system. Your surgeon will also review medications, allergies, past operations and medical conditions such as diabetes, heart disease or osteoporosis. Optimising these factors before surgery can lower risk and support recovery.
During a total knee replacement, damaged joint surfaces at the end of the thigh bone and top of the shin bone are resurfaced with metal components, with a durable bearing surface between them. In selected patients whose arthritis is confined to one part of the knee, a partial knee replacement may be considered instead. Preserving healthy parts of the joint can be appealing, but partial replacement is not suitable when arthritis affects multiple compartments or when the knee is unstable.
After surgery, pain control, early mobilisation and prevention of complications are priorities. Most patients are encouraged to stand and begin walking with support soon after the operation, guided by the treating team and physiotherapist.
Recovery after robotic knee replacement
Recovery is active rather than passive. The operation addresses the arthritic joint, but strength, confidence and movement need to be rebuilt afterwards. The early weeks focus on wound care, controlling swelling, regaining full straightening, improving knee bend and walking safely with the appropriate aid.
Many patients progress from a walking frame to sticks and then independent walking over the following weeks, although timelines vary. Desk-based work may be possible earlier than roles involving prolonged standing, climbing, carrying or manual labour. Driving should only resume when you can safely control the vehicle, are no longer affected by strong pain medication and have been cleared by your surgeon.
Swelling, warmth and disrupted sleep can persist for weeks and sometimes months. This does not necessarily mean something is wrong, but worsening pain, increasing redness, fever, wound discharge, calf swelling, chest pain or breathlessness require urgent medical advice.
Meaningful improvement often continues for many months. Patients who approach rehabilitation steadily tend to do better than those who push through severe pain one day and stop moving for several days afterwards. Regular exercises, sensible pacing and communication with the care team are more productive than trying to accelerate recovery through willpower alone.
Questions worth asking your orthopaedic surgeon
Will a full or partial knee replacement suit my arthritis?
The answer depends on which parts of the joint are worn, the condition of the ligaments, leg alignment and your symptoms. A partial replacement can be excellent for the right knee, but a total replacement is more appropriate for widespread arthritis.
What results can I reasonably expect?
Most people seek less pain and improved walking ability, not a knee that feels exactly like their natural joint. Discuss the activities that matter most to you, whether that is returning to the golf course, travelling comfortably, kneeling for religious practice, or keeping up with grandchildren.
What are the risks?
All knee replacements carry risks, including infection, bleeding, blood clots, stiffness, persistent pain, numbness around the scar, implant wear and the possibility of further surgery in the future. Serious complications are uncommon, but an informed decision requires a clear discussion of how they are prevented and managed.
The right time for knee replacement is usually when pain and limitation have become unacceptable despite sensible treatment, not simply when an X-ray looks severe. A careful assessment with an experienced orthopaedic specialist can clarify whether robotic assistance, another surgical technique or continued non-surgical care offers the most appropriate path back to comfortable movement.
Dr Chang is certified to use the 3 major robotic assisted TKR systems in Singapore – Verlys, Makoplasty and ROSA.
