Total Knee Replacement: Robotic and Computer-Assisted Surgery
Overview
Total knee replacement resurfaces the damaged parts of the knee with artificial components. Robotic or computer-assisted systems may help the surgeon plan component position, guide bone preparation and assess alignment or ligament balance. The surgeon remains in control throughout the operation. These technologies do not remove the usual risks or guarantee a better result, and their long-term advantage over well-performed conventional surgery remains uncertain.
Who may be suitable?
Total knee replacement is usually considered when arthritis affects more than one part of the knee, or when deformity, ligament function or symptoms make a partial replacement unsuitable. Typical reasons include persistent pain, disturbed sleep, reduced walking, stiffness and difficulty with work, self-care or valued activities.
Suitability depends on symptoms, examination, weight-bearing X-rays, general health, expected benefit, support at home and ability to participate in rehabilitation. Surgery is elective. It can be deferred when non-surgical care remains acceptable or when individual risk outweighs likely benefit.
Alternatives to surgery
- Education, activity modification and a structured exercise program.
- Weight management where relevant.
- Walking aids, bracing or practical changes at home and work.
- Topical or oral medicines when medically appropriate.
- A selected injection for temporary symptom relief after discussion of likely benefit and risk.
- Partial knee replacement or corrective bone-cutting surgery (osteotomy) in selected patterns of isolated disease.
- Continuing non-surgical care.
What happens during the operation?
Through an incision at the front of the knee, damaged joint surfaces and a controlled amount of underlying bone are removed from the end of the thigh bone and the top of the shin bone. Metal components and a plastic bearing are inserted. Alignment, stability and movement are checked, and the kneecap is assessed. The kneecap surface is replaced selectively rather than automatically in every case.
Components may be fixed with cement or a cementless surface. Implant, fixation and alignment are selected for anatomy, ligament function, bone quality and deformity.
What do robotic and computer-assisted systems do?
These systems provide measurements and navigation during surgery. Depending on the platform, they use a preoperative scan or mapping performed in theatre. They can help the surgeon plan component position, guide bone preparation and assess how adjustments affect alignment and ligament balance.
The system does not operate independently: the surgeon remains responsible for every decision and performs the operation. Robotic or computer assistance may improve the precision or consistency of some technical measurements, but it does not remove the usual risks or guarantee less pain, faster recovery or longer implant survival. Well-performed conventional total knee replacement remains an established option.
Preparing for surgery
- Optimise diabetes, anaemia, nutrition, skin problems and other medical conditions.
- Stop smoking and discuss nicotine use well before surgery.
- Review medicines, including anticoagulants, diabetes medicines, anti-inflammatory drugs and immunosuppressive treatment.
- Build strength and walking capacity as symptoms allow and plan support, transport and home safety.
- Treat active dental, skin or other infection before surgery. After joint replacement, tell your dentist about the implant. Routine preventive antibiotics are not automatically needed for every dental procedure; individual advice depends on the procedure and your infection risk.
Hospital care and recovery
Most people begin standing and walking with assistance soon after surgery. Pain relief usually combines several approaches to reduce reliance on opioid medicines. Blood-clot prevention is tailored to clotting and bleeding risk and includes early movement, with medication and mechanical measures when indicated.
Early goals are safe walking, full knee straightening and steadily improving bend. Swelling, warmth and disturbed sleep are common in the early weeks, while strength and endurance improve over months. Driving and work depend on the operated side, medicines, physical demands and safe vehicle control; follow individual advice from your treating team and insurer.
Expected benefits and limitations
Many appropriately selected people obtain meaningful pain relief and improved daily function, but a replacement does not become a normal natural knee. Some people continue to notice stiffness, swelling, numbness around the scar, difficulty kneeling or residual pain. High-impact activity may increase load on the implant and is usually limited.
A technically accurate operation cannot guarantee satisfaction. Pain from the hip, back, nerves or other conditions may remain and should be considered before surgery.
Implants can function for many years, but no replacement is permanent. Infection, instability, fracture, loosening or wear may lead to revision surgery.
Risks
- Infection, wound problems, bleeding or need for further surgery.
- Blood clots, pulmonary embolism, heart, lung or other medical complications.
- Stiffness, persistent pain, swelling or dissatisfaction despite technically satisfactory surgery.
- Nerve or blood vessel injury, numbness around the scar or weakness.
- Instability, kneecap problems, fracture, loosening or wear.
- Anaesthetic complications and, rarely, limb- or life-threatening events.
Seek urgent review after surgery
Seek urgent care for chest pain, shortness of breath, fainting, marked calf swelling, fever with increasing wound redness or drainage, rapidly worsening pain, new weakness or numbness, or a fall followed by inability to bear weight.
Frequently asked questions
Is robotic knee replacement performed by a robot?
No. The surgeon performs the operation and makes the decisions. The system is a planning and guidance tool.
Does robotic surgery guarantee a better knee?
No. It may improve consistency of some technical measurements, but pain relief, function and implant longevity depend on many factors and superior long-term outcomes are not guaranteed.
How long does recovery take?
Early walking begins soon after surgery, but swelling, strength and confidence commonly continue to improve for many months. Recovery is individual rather than a fixed calendar.
Can I kneel after knee replacement?
Kneeling is generally not harmful once the wound has healed, but numbness or discomfort may make it difficult. Gradual practice on a padded surface may help.
General information
This page provides general information only. It cannot diagnose your condition or replace advice from a clinician who has assessed you. Your treatment and recovery plan may differ from the examples described here. Follow the instructions from your treating team. In an emergency, call 000 or attend the nearest emergency department.