At a glance
Robotic knee replacement is a surgical procedure in which a damaged knee joint is removed and replaced with an artificial implant, guided by a robotic arm that the surgeon controls in real time.
Before the operation, the surgical system creates a precise three-dimensional map of your knee using CT scan data. During surgery, the robotic arm helps the surgeon cut away only the diseased bone and cartilage (the smooth tissue that cushions your joints), then positions the metal and plastic implant at the exact angle calculated for your anatomy. The robot does not operate on its own; it works as a precision tool in the surgeon's hands.
Medical Condition
This procedure is used when knee pain and loss of function can no longer be managed with non-surgical treatments such as physiotherapy, pain relief medication, or injections.
- Severe osteoarthritis (joint wear where cartilage has broken down over time), the most common reason for knee replacement
- Rheumatoid arthritis (an autoimmune disease that inflames and destroys joints) that has caused lasting joint damage
- Post-traumatic arthritis (joint damage following a fracture or serious knee injury)
- Avascular necrosis (bone death caused by loss of blood supply) affecting the knee
- Severe knee deformity, such as significant bow-leg or knock-knee that limits daily activity
Robotic assistance is especially considered when exact implant positioning is critical, for example in knees with unusual anatomy or significant deformity, or when the surgeon wants to preserve as much healthy bone as possible.
Not every patient with knee pain is a candidate. Your doctor will likely advise against surgery in certain situations.
- Active infection in or around the knee joint
- Severe peripheral artery disease (poor circulation in the legs) that may prevent healing
- Significant obesity combined with other medical conditions that make anaesthesia very high risk
- Bone or soft-tissue tumours around the knee that require a different surgical approach
- Insufficient bone stock to anchor the implant securely
Risks & Complications
Robotic knee replacement is a well-established surgery, but like any major operation it carries recognised risks that your surgical team will discuss with you beforehand.
- Pain and swelling around the knee in the weeks after surgery, which is expected and managed with medication
- Deep vein thrombosis or DVT (a blood clot forming in the leg veins), which is why blood thinners are routinely prescribed after the procedure
- Pulmonary embolism (a blood clot that travels to the lungs), a rare but serious complication
- Wound infection, ranging from a surface skin infection to a deeper infection around the implant that may require further surgery
- Implant loosening or wear over many years, which can eventually require a revision (repeat) operation
- Stiffness of the knee joint if rehabilitation is not completed as directed
- Nerve or blood vessel injury near the knee, causing numbness, weakness, or circulatory problems
- Anaesthesia-related reactions, including breathing difficulties or allergic responses
- Leg length difference or altered walking pattern if implant alignment does not match the body's mechanics perfectly
- Fracture of the bone around the implant, especially in patients with weaker bone density
Preparation & Procedure
Preparation begins several weeks before the operation and covers your lifestyle, medications, and pre-operative tests.
On the lifestyle side, most hospitals ask patients to stop smoking at least four to six weeks before surgery, since smoking slows bone and wound healing. Alcohol is usually restricted in the days leading up to the procedure. You will be told to stop eating solid food and to avoid dairy products for a set number of hours before the operation, and to stop drinking even clear fluids closer to the time your anaesthesia begins. Your team will give you exact fasting instructions.
Medications need to be reviewed carefully. Blood thinners, certain anti-inflammatory drugs, and some herbal supplements are typically paused before surgery to reduce bleeding risk. Your orthopaedic and anaesthesia teams will coordinate this with your other doctors.
Before the date is confirmed, you will usually have several tests to make sure your body is ready.
- Blood tests to check for anaemia (low red blood cells), kidney and liver function, and clotting ability
- CT scan of the knee to generate the three-dimensional map the robotic system will use
- X-rays of the knee and sometimes the hip and ankle to assess alignment
- ECG (electrocardiogram, a recording of your heart's electrical activity) to screen for heart conditions
- Urine test to rule out an existing infection
- Chest X-ray in patients with respiratory conditions
- Dental clearance in some hospitals, since mouth bacteria can travel to a new joint implant
On the day of surgery, the procedure typically follows these steps.
- You are admitted and changed into a surgical gown; an intravenous (IV) line is placed in your arm for fluids and medication.
- The anaesthesia team gives you either general anaesthesia (you are fully asleep) or spinal anaesthesia (you are awake but cannot feel or move your legs); your team will discuss the best option for you.
- The surgical team positions your leg and places sterile drapes around the knee.
- The surgeon makes an incision (cut) along the front of the knee to access the joint.
- Small tracking sensors are attached to the bone; the robotic system uses these to follow the exact position of your knee in real time.
- The surgeon uses the robotic arm to cut away the damaged surfaces of the thighbone (femur), shinbone (tibia), and sometimes the kneecap (patella), guided by the pre-planned map.
- Metal components are fixed to the trimmed bone ends, and a smooth plastic spacer is placed between them to recreate the joint surface.
- The surgeon checks the knee's movement, stability, and alignment before closing the incision.
- A drain may be placed to remove fluid, and the wound is closed with sutures or staples and dressed.
Aftercare
Recovery from robotic knee replacement is active, not passive; starting movement early is a deliberate part of the healing plan.
- Most patients spend two to five nights in hospital, where nurses monitor pain, circulation in the leg, and the wound.
- A physiotherapist (movement specialist) usually visits within the first day after surgery to begin gentle bending and walking exercises with support.
- Blood thinners are prescribed for several weeks after discharge to reduce the risk of DVT.
- The wound needs to be kept dry and clean until sutures or staples are removed, usually around ten to fourteen days after surgery.
- Walking aids such as crutches or a walking frame are used for some weeks; your physiotherapist will guide when to progress to walking without support.
- Driving is typically not permitted until the operated leg can respond quickly and without pain, which varies by individual and the side operated on.
- Returning to a desk job usually takes less time than returning to physical work; your surgeon will advise based on your specific role.
- Swelling in the knee can persist for several months; elevating the leg and using ice packs as directed helps manage this.
- Outpatient physiotherapy sessions continue for weeks to months to restore strength, balance, and range of motion.
- Follow-up X-rays are taken at regular intervals, often at six weeks, six months, and one year, to confirm the implant is seated correctly.
- High-impact activities such as running and jumping are generally discouraged long-term to protect the implant; low-impact activities like walking, swimming, and cycling are usually encouraged.
- The implant can last many years in most patients, but it is not considered a permanent fix and its lifespan depends on body weight, activity level, and bone quality.
Cost & What Determines It
The price of robotic knee replacement varies widely depending on where the surgery is done, the hospital's facilities, and the specifics of your case. The robotic system itself represents a significant capital investment for any hospital, and that is reflected in the overall cost compared with conventional knee replacement.
- Complexity of the case: a straightforward single-knee replacement costs less than a severely deformed knee requiring custom implant components or extensive bone grafting
- Choice of implant: standard implants differ in price from premium or custom-fitted implants designed for individual anatomy
- Hospital class and country: private tertiary hospitals in major cities, and hospitals in countries with higher operating costs, charge more for the same procedure
- Length of hospital stay: each additional night adds room, nursing, and monitoring fees
- Type of anaesthesia and anaesthesia team fees, which are often billed separately from the surgeon's fee
- Physiotherapy sessions during the inpatient stay, which may or may not be bundled into the package
- Pre-operative CT scan and other imaging used specifically to program the robotic system
- Post-operative medications including blood thinners, pain relief, and any antibiotics used
Hospital packages for robotic knee replacement typically include the surgeon's fee, operating theatre use, the implant, standard inpatient stay, and basic nursing care. Items that are often billed separately include the anaesthesiologist's fee, physiotherapy sessions beyond a set number, additional diagnostic tests ordered after surgery, take-home medications, and any extended stay needed because of a complication.
For Indonesian patients, BPJS Kesehatan and most Indonesian health insurance policies do not cover treatment received abroad. Patients who travel for this procedure usually pay entirely out of pocket or through a private international health insurance plan that explicitly covers overseas surgery. Before travelling, ask the hospital for a written cost estimate that itemises every fee, including what happens if the stay needs to be extended. This protects you from unexpected charges on discharge.
Frequently Asked Questions
How long does robotic knee replacement surgery take?
The operation usually takes between one and two hours, though the total time in the operating room is longer because of preparation and anaesthesia. The robotic system helps the surgeon map your knee precisely before making any cuts, which can add some time compared with traditional surgery. Your surgeon will give you a clearer estimate once they have reviewed your scans.
How much does robotic knee replacement cost?
The cost depends on several factors specific to your case, including the implant chosen, the hospital class, and how many nights you need to stay after surgery. The robotic equipment itself also affects the overall price compared with conventional knee replacement. Requesting a written estimate from the hospital is the most reliable way to understand what your treatment will cost.
What anaesthesia is used and how much pain will I feel after robotic knee replacement?
Most patients receive either spinal anaesthesia (numbing from the waist down) or general anaesthesia, and your anaesthetist will decide which suits you best. Pain in the first few days after surgery is normal and is managed with prescribed pain relief, usually given through a drip or tablets. Most people find the discomfort becomes much more manageable within one to two weeks as swelling settles.
When can I go back to work and normal activities after robotic knee replacement?
Most people can return to a desk job within four to six weeks, while jobs involving standing or walking for long periods typically take longer. Walking with support usually begins within a day or two of surgery, and physiotherapy (guided exercise to rebuild strength and movement) starts soon after. Full recovery, including returning to low-impact activities like swimming or cycling, often takes three to six months, though this varies from person to person.
This page is general information, not a substitute for medical advice. Every case is different. Your doctor decides what is right for you.
