How Long Does a Robotic Knee Replacement Take

A robotic knee replacement procedure typically takes between 60 and 120 minutes in the operating theatre. While the core surgical duration is comparable to conventional methods, additional time is allocated for intraoperative system registration and real-time mapping of your unique joint anatomy.

Factors such as patient anatomy, surgical complexity, and pre-operative planning workflow can also influence the total time spent in surgery. Understanding this timeline helps patients properly prepare for their day of treatment and set realistic expectations for the immediate recovery process.

What Is Robotic Knee Replacement Surgery?

Robotic knee replacement surgery is a form of joint replacement in which the surgeon uses a robotic arm system to assist with precise bone preparation and implant positioning. The surgeon remains in full control throughout the procedure. The robotic arm acts as a precision instrument, helping to execute the surgical plan with sub-millimetre accuracy rather than operating independently.

There are two main types of knee replacement performed with robotic assistance:

• Total knee replacement: Most commonly performed. The entire knee joint surface is resurfaced with an implant, typically when arthritis (the gradual wearing away of joint cartilage) affects multiple areas of the knee.
• Partial knee replacement (also called unicompartmental knee replacement): only the damaged compartment of the knee joint is replaced, preserving healthy bone and tissue in the remaining compartments.

How the Procedure Duration Breaks Down

A robotic knee replacement does not have a single fixed duration. The total time from hospital arrival to leaving the recovery room spans several distinct stages, each serving a specific purpose.

Anaesthesia and surgical preparation

On the day of surgery, you will be prepared for the procedure in the anaesthetic room. The anaesthesia team will administer either general anaesthesia (where you are fully asleep) or spinal anaesthesia (where the lower body is numbed while you remain awake but sedated). This preparation phase, including positioning, draping, and final checks, typically takes about 15 to 40 minutes before the surgical incision is made.

The robotic-assisted procedure itself

The robotic system registers your knee using real time anatomic landmarks. Software analysis will help pre-determine the implant positioning, gap balancing and ligament tension required. The surgeon then performs the bone cuts and implant placement with the robotic arm providing real-time guidance. Less soft tissue release is required given the planning and execution of the bone cuts with higher accuracy. The robot and software helps confirm the correct cuts and gaps have been achieved accurate to the millimetre. The actual implants are then cemented in place.

Closing and immediate post-operative care

The surgical team closes the wound in layers. You are then transferred to the recovery room, where nursing staff monitor your vital signs, pain levels, and circulation as the anaesthesia wears off. This phase typically takes 30 to 60 minutes before you are moved to your ward.

The durations below are general estimates. Individual cases may vary depending on joint complexity, patient anatomy, and other clinical factors.

How Does Robotic Surgery Compare to Conventional Knee Replacement in Duration?

Robotic knee replacement surgery may take slightly longer than conventional knee replacement, mainly because it requires additional time to register the robotic system to your knee and verify the surgical plan intraoperatively (during the procedure). In practice, this difference is often in the range of 15 to 30 minutes.

This additional time reflects the precision-planning phase rather than a more complex or riskier procedure. The aim is to make bone cuts with greater accuracy and align the implant to your individual anatomy. Outcomes vary by individual, and your surgeon can discuss what this may mean for your specific case.

The most appropriate surgical approach, whether robotic-assisted or conventional, depends on your specific joint condition, anatomy, and overall health. A specialist assessment can help determine which option suits your circumstances.

The comparison below reflects general trends from published evidence. Individual outcomes depend on the patient’s anatomy, the extent of joint damage, and other clinical considerations.

What Factors Affect How Long the Surgery Takes?

Because no two knees are identical, the duration of your surgery will depend on a combination of factors.

Complexity of the joint damage

A knee with severe deformity, significant bone loss, or previous surgical hardware in place requires more time to prepare than a straightforward case. If the joint has deteriorated extensively, the surgeon may need additional time to ensure the bone surfaces are adequately prepared before the implant can be correctly positioned.

Whether a partial or total knee replacement is performed

A partial knee replacement involves a smaller surgical area and preserves more of the natural joint, which generally means a shorter operating time. A total knee replacement involves resurfacing all three compartments of the knee and typically takes longer. Your surgeon will determine which procedure is appropriate based on the pattern of arthritis in your joint.

Patient health and body composition

Factors such as body weight, muscle mass, and underlying health conditions can influence how the surgical team positions and accesses the knee joint. In some cases, additional time is needed to ensure safe and accurate exposure of the joint surfaces.

Surgeon experience with robotic-assisted techniques

Familiarity with the robotic system, including efficient registration and real-time plan verification, contributes to a well-paced procedure. Surgeons who perform robotic-assisted knee replacements regularly develop a structured workflow that supports efficiency at each stage.

The time dedicated to intraoperative planning and alignment checks aims to support precise bone preparation and implant positioning according to the surgical plan. Your surgeon can discuss how these factors apply to your specific condition.

What to Expect on the Day of Surgery

On arrival at the hospital, you will be admitted to the ward and reviewed by the nursing team and your anaesthetist. Your medical history, medications, and allergy status will be confirmed. You will be asked to change into a hospital gown and may be given a pre-operative sedative to help you feel calm.

In the operating room, the anaesthesia team will administer your anaesthesia. Once you are ready, the surgical site will be cleaned and draped. The surgeon will then begin the procedure, using the robotic arm to guide bone preparation and implant placement according to your individual plan.

After the procedure, you will be moved to the recovery room. The nursing team will monitor your blood pressure, heart rate, pain levels, and the circulation in your leg as the anaesthesia wears off. You may feel groggy, thirsty, or mildly nauseated, which are common responses to anaesthesia.

Most patients are transferred to their ward within one to two hours of the procedure ending, where physiotherapy (physical rehabilitation) typically begins as early as the same day or the following morning.

Recovery Timeline After Robotic Knee Replacement

While individual experiences vary, the following milestones give a general picture of what the recovery journey often looks like.

The first 24 to 48 hours

Many patients are encouraged to stand and take their first steps with the support of a physiotherapist within 24 hours of surgery. Early movement may help reduce the risk of blood clots (blockages in the veins caused by prolonged stillness), support circulation, and begin the process of restoring joint mobility. Pain is managed with a combination of medications, and the surgical team will monitor the knee for swelling and warmth.

Weeks one to six

Most patients are discharged from hospital within two to four days, depending on their progress and home circumstances. During the first six weeks, the focus is on:

• Gradually increasing walking distance with the aid of a walking frame or crutches
• Attending physiotherapy sessions to rebuild strength and flexibility
• Managing swelling through elevation and ice application
• Avoiding high-impact activities and prolonged standing

By the end of this phase, many patients are walking independently and managing most daily activities such as preparing meals, bathing, and moving around the home.

Three months and beyond

By three months, many patients report improvement in pain levels and mobility. Returning to low-impact activities such as swimming or cycling may be possible within this period, subject to your surgeon’s guidance. Recovery, including the return to more demanding activities, typically continues over six to twelve months as the muscles around the knee regain strength and the implant settles into position. Individual timelines vary.

Clinical Insights

Surgical efficiency in robotic knee replacement relies on structured pre-operative planning and intraoperative workflow. Dr Kau Chung Yuan is a fellowship-trained orthopaedic surgeon who completed subspecialty training in adult reconstruction surgery in the United Kingdom. He now routinely performs ROSA robotic-assisted total knee replacements. His practice incorporates enhanced recovery principles and minimally invasive techniques, focusing on patient assessment, precise implant positioning, and soft tissue management.

Making an Informed Decision About Robotic Knee Replacement

Consider asking your surgeon:

• Whether robotic-assisted, computer-navigated, or conventional surgery is most appropriate for your specific pattern of knee damage
• Whether you are a candidate for partial knee replacement or whether a total knee replacement is more suitable
• What the expected surgical duration is for your case, given your anatomy and the extent of joint damage
• What the recovery milestones will look like for someone with your health profile

When to Seek Professional Help

If persistent knee pain or stiffness interferes with your daily activities, an assessment by an orthopaedic surgeon can help identify the underlying cause and determine whether non-surgical or surgical management is appropriate.

• Persistent knee pain that has not responded to conservative treatments such as physiotherapy, weight management, or anti-inflammatory medications
• Difficulty performing everyday activities such as walking, climbing stairs, or rising from a chair
• Joint stiffness that limits your range of movement, particularly in the morning or after periods of rest
• A noticeable change in the alignment of your knee, such as a bowing inward or outward of the leg
• Reduced quality of life due to pain or restricted mobility

Seeking an early assessment does not commit you to surgery. It does, however, give you access to a fuller range of treatment options and allows your surgeon to monitor how your joint is changing over time.

Commonly Asked Questions

Is robotic knee replacement surgery painful?

Discomfort after knee replacement surgery is expected and is managed with a structured pain relief plan that typically includes oral medications and, in some cases, nerve blocks (injections that temporarily reduce sensation around the knee). Many patients find that pain is managed during the hospital stay and gradually reduces over the following weeks. Your surgical and nursing team will adjust your pain management as your recovery progresses.

How long is the hospital stay after robotic knee replacement?

Most patients stay in hospital for two to three days following robotic knee replacement surgery. The exact duration depends on how quickly you are mobilising, your pain levels, and whether any support is available at home. Your physiotherapist and surgical team will assess your readiness for discharge before you leave.

Can both knees be replaced at the same time using robotic surgery?

Replacing both knees during a single procedure (known as bilateral simultaneous knee replacement) is technically possible but is not appropriate for every patient. The decision depends on your overall health, cardiovascular fitness, and the surgeon’s assessment of whether the combined physiological demand of two simultaneous replacements is safe for you. Your surgeon will discuss this with you based on your individual circumstances.

Is robotic knee replacement suitable for everyone with knee arthritis?

Robotic knee replacement may not be appropriate for every patient with knee arthritis. Suitability depends on the pattern and severity of joint damage, your overall health, bone quality, and other anatomical factors. Some patients may be better served by conventional or computer-navigated techniques. A thorough assessment, including imaging and a detailed clinical examination, is needed to determine the most appropriate approach for your specific situation.

How much does robotic knee replacement cost in Singapore?

The cost of robotic knee replacement in Singapore varies depending on the hospital you attend, your choice of ward, and your insurance coverage. You may wish to request a detailed cost estimate from your surgeon’s clinic before proceeding.

Next Steps

Before your consultation, consider:

• Writing down your symptoms, including when they started, what makes them worse, and how they affect your daily life
• Gathering any existing imaging such as X-rays or MRI scans
• Preparing a list of questions about whether robotic-assisted or conventional surgery is appropriate for your condition
• Asking about the expected recovery timeline based on your health and lifestyle

Learn More About Robotic Knee Replacement in Singapore

If you wish to explore treatment options for knee arthritis, consultations are available to discuss individual knee conditions, diagnostic imaging, and suitable surgical approaches.

This article is for informational purposes only and does not constitute medical advice. Please consult a qualified healthcare professional for personalised guidance.