How Long Does a Knee Replacement Operation Take?

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How Long Does a Knee Replacement Operation Take?

September 25, 2026

Knee replacement surgery is one of the most commonly recommended surgical treatments for people experiencing severe knee pain, stiffness, reduced mobility, or advanced joint damage. If your orthopedic doctor has recommended knee replacement surgery, one of the first questions you may have is: How long does a knee replacement operation take?

In most cases, a primary knee replacement operation takes approximately 1 to 2 hours, although the exact duration may vary depending on the type of knee replacement, the condition of the joint, the surgical technique being used, and the patient’s overall health. Mayo Clinic also notes that knee replacement surgery commonly takes around one to two hours.

However, the actual operation is only one part of the surgical journey. Preparing for anesthesia, positioning the patient, surgical preparation, recovery from anesthesia, and post-operative monitoring mean that a patient may spend several hours in and around the operation theatre.

If you are considering knee replacement surgery and looking for an experienced knee replacement surgeon in Faridabad, consulting an orthopedic specialist such as Dr. Deepak Mishra, Best Orthopedic Doctor in Faridabad, can help you understand the procedure, expected surgery time, recovery process, and treatment options according to your individual knee condition.

What Is Knee Replacement Surgery?

Knee replacement surgery, medically known as knee arthroplasty, is a surgical procedure in which damaged or worn-out surfaces of the knee joint are removed and replaced with artificial components.

The artificial joint components are generally made using specially designed metal and high-grade plastic materials that allow the knee to move more smoothly.

The procedure is commonly considered in patients suffering from advanced knee problems that significantly affect walking and everyday activities.

Some of the common conditions that may eventually lead to knee replacement include:

  • Osteoarthritis of the knee
  • Rheumatoid arthritis
  • Severe cartilage damage
  • Post-traumatic arthritis
  • Severe knee deformity
  • Persistent knee pain and stiffness
  • Difficulty walking or climbing stairs
  • Knee pain that does not improve adequately with conservative treatment

Osteoarthritis is one of the most common reasons for knee replacement surgery. The NHS notes that knee replacement is generally considered when treatments or lifestyle changes have not provided sufficient relief and knee pain is having a significant impact on daily life.

How Long Does a Knee Replacement Operation Take?

A common question patients ask before surgery is, “How many hours does knee replacement surgery take?”

For a routine primary knee replacement, the actual surgical procedure generally takes:

Approximately 1 to 2 hours

The duration can be shorter or longer depending on the individual case.

A typical knee replacement involves removing damaged surfaces from the thigh bone and shin bone, preparing the bones for the implants, placing the artificial components, checking stability and alignment, and then closing the surgical incision.

Several hospital guidance resources also describe primary knee replacement surgery as usually taking around 1 to 1.5 hours, although individual procedures may vary.

It is important to understand that surgery time is not the same as the total time spent in the operation theatre area.

Additional time is required before and after the actual operation for anesthesia and monitoring.

Knee Replacement Surgery Timeline

Understanding what happens on the day of surgery can reduce anxiety and help patients and their families prepare better.

1. Pre-Operative Preparation

Before the operation begins, the healthcare team will prepare the patient for surgery.

This may include:

  • Checking blood pressure, pulse and oxygen levels
  • Confirming medical history
  • Reviewing investigations
  • Marking the surgical site
  • Establishing an IV line
  • Administering appropriate medication
  • Preparing the leg for surgery
  • Discussing anesthesia

The surgical and anesthesia teams also perform multiple safety checks before starting the operation.

2. Anesthesia

Knee replacement surgery may be performed under:

  • General anesthesia, or
  • Spinal/regional anesthesia, sometimes combined with sedation

The most appropriate anesthesia option depends on the patient’s medical condition, surgeon’s recommendation, anesthetist’s assessment and other individual factors.

3. Surgical Procedure

Once anesthesia has taken effect, the surgeon begins the knee replacement.

The operation itself generally takes around 1–2 hours for an uncomplicated primary knee replacement.

4. Recovery Room

After surgery, patients are transferred to a recovery area where their vital signs and immediate post-operative condition are monitored.

The medical team may monitor:

  • Blood pressure
  • Heart rate
  • Oxygen saturation
  • Pain
  • Surgical wound
  • Leg movement and sensation
  • Recovery from anesthesia

Therefore, even if the actual operation takes around 90 minutes, the overall time from entering the operating theatre area to returning to the hospital room can be considerably longer.

What Happens During Knee Replacement Surgery?

Understanding the different stages of knee replacement can also explain why surgery takes approximately one to two hours.

Step 1: Accessing the Knee Joint

The orthopedic surgeon makes an incision over the knee to access the damaged joint.

Step 2: Removing Damaged Joint Surfaces

Damaged cartilage and a carefully measured amount of underlying bone are removed from the affected surfaces of the knee.

Healthy structures are preserved wherever possible.

Step 3: Preparing the Bone

The ends of the thigh bone or femur and shin bone or tibia are shaped precisely so that the knee implants can be positioned appropriately.

Step 4: Implant Placement

Specially designed prosthetic components are positioned over the prepared bone surfaces.

These components recreate the smooth surfaces of the knee joint.

Step 5: Plastic Spacer Placement

A medical-grade plastic insert is positioned between the metal components. It acts as a smooth bearing surface and helps the knee move more freely.

Step 6: Knee Alignment and Stability Check

Before completing the operation, the surgeon evaluates:

  • Knee alignment
  • Stability
  • Range of movement
  • Implant positioning
  • Soft tissue balance

Step 7: Closing the Incision

Once the surgeon is satisfied with the position and functioning of the new joint, the surgical area is closed and dressed.

Does a Total Knee Replacement Take Longer Than a Partial Knee Replacement?

The duration of surgery can depend significantly on the type of knee replacement being performed.

Total Knee Replacement

A total knee replacement involves resurfacing the major damaged surfaces of the knee joint.

It commonly takes approximately 1–2 hours, although the duration varies between patients.

Partial Knee Replacement

A partial knee replacement replaces only the damaged compartment of the knee while preserving healthy areas of the joint.

Because a smaller portion of the knee is operated upon, some partial knee replacement procedures may be completed in less time than a total knee replacement.

However, the decision between partial and total knee replacement should not be based simply on which operation takes less time.

The right procedure depends on:

  • Location of arthritis
  • Amount of joint damage
  • Ligament condition
  • Knee alignment
  • Patient’s age
  • Activity level
  • Overall health

Your knee replacement surgeon in Faridabad will examine your knee and review imaging before recommending the most appropriate surgical approach.

How Long Does Robotic Knee Replacement Surgery Take?

Robotic-assisted knee replacement uses advanced technology to help the surgeon plan and execute certain steps of knee replacement with greater precision.

Contrary to a common misconception, a robot does not independently perform the surgery.

The orthopedic surgeon remains in control of the procedure. Robotic technology serves as an additional surgical tool that may help with planning, bone preparation and implant positioning. Newcastle Hospitals also notes that the surgeon remains in control during robotic-assisted knee replacement procedures.

The exact duration of robotic knee replacement depends on:

  • Type of robotic system
  • Complexity of the patient’s knee
  • Whether total or partial replacement is performed
  • Surgical workflow
  • Surgeon and team’s experience
  • Previous surgery or deformity

The focus should therefore be on accurate surgical planning and an appropriate treatment outcome rather than simply completing the procedure as quickly as possible.

What Factors Can Affect Knee Replacement Surgery Time?

No two knee replacement surgeries are exactly the same.

Several factors can affect how long the procedure takes.

1. Type of Knee Replacement

Partial, total and revision knee replacement procedures have different levels of complexity.

2. Severity of Joint Damage

A severely damaged or deformed knee may require additional surgical planning and correction.

3. Previous Knee Surgery

Patients who have undergone previous procedures around the knee may have scar tissue or anatomical changes that require additional surgical care.

4. Knee Deformity

Severe bow-legged or knock-kneed deformities can increase the complexity of knee replacement.

5. Patient’s Anatomy

Every patient’s bone structure, ligament condition and knee alignment are different.

6. Surgical Technique

Different surgical techniques and technologies may involve different steps and therefore different operating times.

7. Primary vs Revision Knee Replacement

A revision knee replacement involves replacing or correcting an existing knee implant.

Revision procedures can be significantly more complex than primary knee replacement because the surgeon may need to remove existing implants, manage bone loss and reconstruct the joint.

Because of this additional complexity, revision knee replacement may take longer than routine primary knee replacement.

How Long Do You Stay in Hospital After Knee Replacement?

The length of hospital stay after knee replacement surgery varies considerably.

Some patients may be discharged relatively quickly, while others require additional hospital observation and rehabilitation.

Modern surgical pathways have allowed appropriately selected patients to mobilize earlier and, in some centres, even return home on the same day or after a short hospital stay. Mayo Clinic notes that hospital stay varies according to individual needs, and some patients can go home on the day of surgery.

Your discharge will depend on factors such as:

  • Overall health
  • Pain control
  • Ability to walk safely
  • Ability to use the bathroom
  • Knee movement
  • Wound condition
  • Home support
  • Other medical conditions
  • Recommendation of the surgical team

Patients should therefore avoid comparing their hospital stay directly with another knee replacement patient.

When Can You Start Walking After Knee Replacement?

One of the most common concerns patients have is when they will be able to stand or walk after knee replacement.

In many modern knee replacement programs, early mobilization is encouraged, depending on the patient’s condition and the surgeon’s protocol.

Patients may initially walk with the assistance of:

  • A walker
  • Crutches
  • Physiotherapist support

Early movement can play an important role in rehabilitation and reducing complications related to prolonged immobility.

However, walking progression should always follow the instructions of the orthopedic and physiotherapy team.

How Long Does It Take to Recover From Knee Replacement Surgery?

Although the operation itself may take only one or two hours, knee replacement recovery takes considerably longer.

Recovery is gradual and varies from patient to patient.

Many patients notice progressive improvements over several weeks, but regaining strength, flexibility, confidence and comfortable mobility may take months.

The NHS notes that full recovery after knee replacement can take several months or longer.

Recovery depends on factors including:

  • Age
  • Muscle strength before surgery
  • General health
  • Type of knee replacement
  • Physiotherapy
  • Nutrition
  • Weight
  • Other medical conditions
  • Motivation and adherence to rehabilitation
  • Condition of the knee before surgery

What Happens During Knee Replacement Recovery?

First Few Days

The focus is generally on:

  • Pain management
  • Swelling control
  • Wound care
  • Assisted standing
  • Walking
  • Basic knee exercises

First Few Weeks

Patients gradually work on:

  • Increasing walking distance
  • Knee bending
  • Straightening the knee
  • Muscle strengthening
  • Performing normal daily activities

Following Months

The emphasis gradually shifts toward:

  • Improving stamina
  • Strengthening the leg
  • Improving knee flexibility
  • Walking more comfortably
  • Returning to suitable daily activities

Recovery should not be rushed. Every patient’s rehabilitation plan should be personalized.

How Long Does a Knee Replacement Last?

Modern knee replacement implants are designed for long-term use.

The longevity of an implant depends on multiple factors, including:

  • Patient age
  • Body weight
  • Activity level
  • Implant type
  • Surgical positioning
  • Bone quality
  • Joint loading
  • Overall health

Mayo Clinic states that most knee replacements can be expected to last at least 15 to 20 years, while the NHS notes that knee replacements can last around 25 years in some cases.

Patients can help protect their replacement by maintaining a healthy body weight, staying active according to their doctor’s recommendations and avoiding activities that place excessive repetitive impact on the joint.

Who May Need Knee Replacement Surgery?

Not every person experiencing knee pain requires surgery.

Initial treatment for knee arthritis may include:

  • Lifestyle modifications
  • Weight management
  • Physiotherapy
  • Muscle strengthening
  • Activity modification
  • Pain-relieving medicines
  • Certain injections
  • Assistive devices

Knee replacement may be considered when knee damage has become severe and conservative treatments are no longer providing adequate relief.

You should consider consulting an orthopedic specialist if you experience:

  • Persistent or severe knee pain
  • Difficulty walking even short distances
  • Pain while climbing stairs
  • Knee pain while resting
  • Significant stiffness
  • Progressive knee deformity
  • Reduced knee movement
  • Difficulty performing routine activities
  • Repeated swelling
  • Poor response to non-surgical treatments

A proper orthopedic evaluation helps determine whether the problem can still be managed conservatively or whether surgery should be considered.

Dr. Deepak Mishra – Best Orthopedic Doctor in Faridabad for Knee Replacement

Choosing an experienced orthopedic specialist is an important part of your knee replacement journey.

Patients searching online for the best orthopedic doctor in Faridabad or an experienced knee replacement surgeon in Faridabad can consult Dr. Deepak Mishra for evaluation and management of knee joint problems.

Knee replacement treatment should always begin with a comprehensive assessment rather than directly deciding on surgery.

A detailed orthopedic consultation may include:

  • Assessment of knee pain
  • Physical examination
  • Evaluation of walking pattern
  • Range-of-motion assessment
  • Review of X-rays and other investigations
  • Discussion of previous treatment
  • Evaluation of overall health
  • Discussion of surgical and non-surgical options

When knee replacement is appropriate, the treatment plan can then be customized according to the patient’s joint condition, age, mobility needs and overall health.

Patients looking for the best knee replacement surgeon in Faridabad should also discuss realistic expectations, surgical approach, implant options, rehabilitation and possible risks before making a treatment decision.

Questions to Ask Your Knee Replacement Surgeon Before Surgery

Before knee replacement surgery, consider asking your orthopedic surgeon:

  1. Do I really need knee replacement surgery?
  2. Can my knee problem still be treated without surgery?
  3. Do I need partial or total knee replacement?
  4. How long will my knee replacement operation take?
  5. What type of anesthesia will be used?
  6. How soon will I be able to stand and walk?
  7. How long will I need to stay in hospital?
  8. What precautions will I need after surgery?
  9. How long will physiotherapy be required?
  10. When can I return to normal activities?
  11. What are the potential complications of surgery?
  12. What type of implant is suitable for me?
  13. Is robotic-assisted knee replacement appropriate for my condition?
  14. When can I drive after surgery?
  15. What activities should I avoid after knee replacement?

Having a clear discussion before surgery can help patients understand what to expect throughout treatment and recovery.

Frequently Asked Questions About Knee Replacement Surgery

1. How many hours does knee replacement surgery take?

A routine primary knee replacement operation usually takes around 1 to 2 hours, although complex cases may require longer.

2. Is knee replacement a major surgery?

Yes. Knee replacement is considered major orthopedic surgery because damaged joint surfaces are removed and replaced with artificial components.

3. How long does a total knee replacement operation take?

A primary total knee replacement generally takes approximately one to two hours, but the exact time depends on the complexity of the knee and surgical approach.

4. Is a 2-hour knee replacement operation normal?

Yes. Surgery lasting approximately 1–2 hours falls within the commonly reported range for primary knee replacement procedures.

5. How soon can I walk after knee replacement?

Early mobilization is commonly encouraged, but the timing depends on your medical condition and your orthopedic surgeon’s rehabilitation protocol.

6. How long will I stay in hospital after knee replacement?

Hospital stay varies between patients. Some appropriately selected patients may return home relatively quickly, while others need longer observation and rehabilitation.

7. How painful is knee replacement surgery?

Pain and discomfort are expected after surgery, particularly during the early recovery phase. Modern pain-control methods, medication and rehabilitation are used to help patients manage post-operative discomfort.

8. How long does it take to recover from knee replacement?

Significant recovery usually takes several weeks to months. The NHS states that full recovery can take several months or longer.

9. Can both knees be replaced at the same time?

Bilateral knee replacement may be considered in selected patients, but it is not suitable for everyone. Your orthopedic surgeon will assess your overall health and knee condition before recommending simultaneous or staged procedures.

10. Who should I consult for knee replacement in Faridabad?

Patients experiencing persistent knee pain, arthritis, stiffness or difficulty walking can consult Dr. Deepak Mishra, an orthopedic doctor and knee replacement surgeon in Faridabad, for an orthopedic assessment and individualized treatment plan.

Conclusion

So, how long does a knee replacement operation take?

For most uncomplicated primary knee replacements, the surgical procedure itself takes approximately 1 to 2 hours. Additional time is required for anesthesia, preparation and post-operative recovery before the patient returns to the hospital room.

However, the duration of surgery should not be the only consideration when planning knee replacement. Accurate diagnosis, careful surgical planning, appropriate implant positioning, rehabilitation and long-term follow-up are equally important.

If severe knee pain, arthritis or stiffness is making it difficult for you to walk, climb stairs or perform everyday activities, an orthopedic evaluation can help determine the right treatment.

For patients searching for the best orthopedic doctor in Faridabad or an experienced knee replacement surgeon in Faridabad, Dr. Deepak Mishra can be consulted for comprehensive assessment and treatment of knee-related conditions.

Early evaluation can help identify whether your knee can be managed with medicines, physiotherapy and lifestyle measures or whether knee replacement surgery should be considered.

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