Types of Knee Replacement Surgery – A Complete Guide by Dr. Parampreet Singh Nagpal

Not all knee replacements are the same. There are several distinct types of knee replacement surgery, each suited to different patterns of joint disease, patient age, activity level, and surgical goals. Understanding the differences helps patients make informed decisions and have realistic expectations about their surgery and recovery. At Nagpal Robotics in Bathinda, Punjab, Dr. Parampreet Singh Nagpal performs all types of knee replacement surgery using advanced robotic systems — ensuring every patient receives the right procedure for their specific condition.

Type 1: Total Knee Replacement (TKR)

What It Is

Total knee replacement — also called total knee arthroplasty (TKA) — is the most commonly performed type of knee replacement. In a total knee replacement, the damaged surfaces of all three compartments of the knee are removed and replaced with artificial components:

• The distal femur (bottom of the thigh bone) is resurfaced with a metal femoral component
• The proximal tibia (top of the shin bone) is resurfaced with a metal tibial tray and polyethylene plastic insert
• The undersurface of the patella (kneecap) may also be resurfaced with a plastic button

Who Needs Total Knee Replacement?

• Patients with Grade 3–4 osteoarthritis affecting multiple compartments of the knee
• Severe rheumatoid arthritis causing widespread joint destruction
• Significant knee deformity (bow-legged or knock-kneed)
• Post-traumatic arthritis affecting the entire knee joint

Robotic Total Knee Replacement at Nagpal Robotics

Using the CUVIS active robot and CORI system, Dr. Nagpal performs total knee replacement with sub-millimetre accuracy. 3D CT-based planning creates a patient-specific surgical blueprint for optimal implant sizing, positioning, and alignment.

Type 2: Partial Knee Replacement (Unicompartmental Knee Arthroplasty – UKA)

What It Is

Partial knee replacement — also known as unicompartmental knee arthroplasty (UKA) — resurfaces only the affected compartment of the knee. The healthy bone, cartilage, and cruciate ligaments in the other compartments are preserved. It can address:

• Medial compartment (inner knee) — the most commonly affected area in osteoarthritis
• Lateral compartment (outer knee) — less common but occurs in specific deformity patterns
• Patellofemoral compartment (between kneecap and thigh bone) — for isolated kneecap arthritis

Advantages of Partial Knee Replacement

• Preserves more natural bone and tissue
• Faster recovery — patients are often discharged 1–2 days earlier
• More natural knee feel — many patients say the knee "feels like their own"
• Smaller incision with minimally invasive technique
• If needed, convertible to total knee replacement later

Who is Suitable for Partial Knee Replacement?

• Arthritis confirmed to a single compartment on X-ray and MRI
• Intact cruciate ligaments (ACL and PCL)
• Correctable deformity (no fixed deformity)
• Age and activity level appropriate for the procedure

Type 3: Bilateral Knee Replacement

What It Is

Bilateral knee replacement involves replacing both knees — either simultaneously in a single operative session (simultaneous bilateral) or in two separate operations (staged bilateral). Most patients at Nagpal Robotics with bilateral severe arthritis benefit from the simultaneous approach.

Simultaneous Bilateral Benefits

• Single anaesthesia exposure — reduces overall anaesthetic risk compared to two separate operations
• Single hospitalisation — saves cost and reduces disruption to family
• Symmetric rehabilitation — both knees recover together, more convenient
• Shorter total recovery period compared to two staged operations

Who is Suitable for Simultaneous Bilateral?

Dr. Nagpal recommends simultaneous bilateral for younger patients with good cardiac and pulmonary reserve, while staged bilateral may be preferred for older patients or those with significant medical comorbidities.

Type 4: Revision Knee Replacement

What It Is

Revision knee replacement is performed when a previous knee replacement has failed. Causes of failure include:

• Aseptic loosening — implant loosening due to bone-implant interface failure
• Infection — periprosthetic joint infection (PJI)
• Implant wear and damage over time
• Instability — laxity of the ligaments around the replaced knee
• Stiffness (arthrofibrosis) — excessive scar tissue formation
• Fracture around the implant (periprosthetic fracture)

Revision Knee Replacement at Nagpal Robotics

Revision knee replacement is significantly more complex than primary replacement. Dr. Nagpal's extensive surgical experience and access to advanced imaging and planning tools make Nagpal Robotics one of the most capable centres in Punjab for revision surgery.

Type 5: Minimally Invasive Knee Replacement

Minimally invasive knee replacement uses smaller incisions and modified surgical approaches to reduce soft tissue disruption. At Nagpal Robotics, robotic technology inherently facilitates minimally invasive techniques by providing precision guidance through smaller surgical windows.

How Dr. Nagpal Decides Which Type is Right for You

The decision involves careful evaluation of:

• X-rays and MRI to determine extent and compartmental distribution of arthritis
• Physical examination — joint deformity, range of motion, ligament integrity
• Patient age, activity level, and expectations
• Medical fitness and comorbidities
• Patient preference after thorough counselling

Frequently Asked Questions