Types of Knee Implants

January 13, 2026

Knee pain that doesn’t improve with medicines, physiotherapy, injections, or lifestyle changes can start affecting daily life—walking, climbing stairs, getting up from a chair, even sleeping. In such cases, knee replacement surgery becomes a reliable option to restore movement and reduce long-term pain. But before surgery, one important question many patients ask is:

“Which type of knee implant is best for me?”

This blog explains the main types of knee implants, how they differ, and what factors help doctors choose the right option for each patient.

What Is a Knee Implant?

A knee implant (also called a prosthesis) is a medical-grade device used to replace the damaged parts of the knee joint. It typically has:

A femoral component (covers the end of the thigh bone)
A tibial component (covers the top of the shin bone)
A plastic insert (acts like cartilage for smooth movement)
Sometimes a patellar component (for the kneecap)

Knee implants are designed to reduce pain, correct deformity (bow-legs/knock-knees), and improve mobility.

Types of Knee Implants Based on Surgery Type

1) Total Knee Replacement (TKR) Implant

This is the most commonly used implant when arthritis or damage affects the whole knee joint.

When it’s recommended:

Advanced osteoarthritis (grade 3–4)
Severe pain while walking/standing
Significant deformity or stiffness

What it replaces:

Both sides of the knee joint (femur and tibia), and sometimes the kneecap surface

Benefits:

Long-lasting pain relief
Strong correction of deformity
Better stability and function

2) Partial Knee Replacement (PKR) Implant (Unicompartmental Knee Implant)

If damage is limited to only one compartment of the knee (medial, lateral, or patellofemoral), a partial knee implant may be advised.

When it’s recommended:

Arthritis confined to one compartment
Ligaments (especially ACL/PCL) are healthy
Less deformity and good knee motion

Benefits:

Smaller incision and less tissue cutting
Faster recovery in many cases
Knee may feel more “natural” because more of your own joint is preserved

Note: Partial knee replacement is not suitable for every patient—selection is crucial.

3) Patellofemoral Knee Implant

This implant replaces only the front part of the knee—between the kneecap (patella) and thigh bone (femur).

When it’s recommended:

Pain and arthritis mainly behind the kneecap
Activities like stairs, sitting-to-standing cause major discomfort

Benefits:

Preserves the rest of the knee joint
Can be a good option in carefully selected patients

Types of Knee Implants Based on Design and Stability

4) Cruciate-Retaining (CR) Knee Implant

“Cruciate-retaining” means the posterior cruciate ligament (PCL) is preserved.

When it’s used:

PCL is healthy and functioning well
Knee stability is good

Advantages:

May feel more natural in some patients
Good stability when ligaments are intact

5) Posterior-Stabilized (PS) Knee Implant

In this design, the PCL is removed and replaced with a special cam-and-post mechanism that provides stability and smooth movement.

When it’s used:

PCL is weak or damaged
Surgeon wants improved stability and range of motion

Advantages:

Reliable knee movement pattern
Often preferred in many standard TKR cases

6) Constrained (Semi-Constrained) Knee Implant

This provides additional stability and is used when ligaments are not strong enough to support the knee.

When it’s used:

Severe deformity
Ligament instability
Complex primary cases

Advantages:

Better stability in difficult knees
Helps in cases where normal implants may not be adequate

7) Hinged Knee Implant (Highly Constrained)

This is the most supportive implant type, used mainly for complex situations.

When it’s used:

Major ligament failure
Severe bone loss
Revision knee replacement (second surgery)

Advantages:

Maximum stability
Useful in highly complex cases
(Usually not required for routine knee replacements.)

Types of Knee Implants Based on Fixation Method

8) Cemented Knee Implant

This is the most widely used method. Bone cement helps attach the implant securely.

Best for:

Most patients, especially above 55–60
Patients with softer bone quality

Benefits:

Strong fixation immediately
Long track record and reliable outcomes

9) Cementless Knee Implant

These implants have a special porous surface that allows bone to grow into it.

Best for:

Younger patients with strong bone quality
Selected cases where bone growth is expected to be good

Benefits:

Potential long-term biological fixation
Can be useful in certain active patients
(Doctor decides suitability based on bone quality and condition.)

10) Hybrid Fixation

A combination approach—one component is cemented and another is cementless.

Used in:

Selected cases based on bone condition and surgical planning

Types of Knee Implants Based on Bearing Surface

11) Fixed-Bearing Knee Implant

The plastic insert is fixed on the metal tibial component.

Best for:

Most routine knee replacements

Benefits:

Strong, stable, widely used
Excellent long-term results in appropriate patients

12) Mobile-Bearing Knee Implant

The plastic insert can rotate slightly, mimicking natural movement.

Best for:

Selected patients with good ligament stability

Benefits:

May reduce wear in some cases
Potential for more natural movement
(Requires precise surgical technique and patient selection.)

Types of Knee Implants Based on Customisation

13) Standard (Off-the-Shelf) Implants

These come in multiple sizes and are chosen during surgery for best fit.

Benefits:

Widely available and tested
Excellent outcomes when fitted properly

14) Patient-Specific / Custom Knee Implants

These are designed using imaging to match an individual’s anatomy.

Benefits:

Improved fit in some cases
May help in complex anatomy
(Not required for every patient; depends on surgeon’s evaluation.)

What Material Are Knee Implants Made Of?

Most knee implants use safe, durable materials such as:

Cobalt-Chromium alloys (strong and wear-resistant)
Titanium alloys (lighter, bone-friendly, often in cementless implants)
Medical-grade Polyethylene (high-quality plastic insert)
Ceramic-coated or Oxinium options in selected cases to reduce wear (doctor-dependent choice)

How Does a Surgeon Decide the Best Implant for You?

The “best implant” depends on the best match for your knee, not just the brand or price. Factors include:

Your age and activity level
Weight and lifestyle
Degree of arthritis and deformity
Ligament stability (ACL/PCL condition)
Bone quality
Range of motion and stiffness
Whether it’s a first-time surgery or revision surgery

A detailed clinical evaluation and imaging help decide the most suitable implant type.

Best Knee Replacement Surgeon in Faridabad: Dr. Deepak Mishra

If you are considering knee replacement and want the right implant selection along with safe surgical planning, Dr. Deepak Mishra is regarded as the best knee replacement surgeon in Faridabad, known for patient-focused care, detailed pre-surgery assessment, and evidence-based implant selection.

Dr. Deepak Mishra currently practices at Asian Hospital, Faridabad.
Appointment Number: +91 8287334003

FAQs: Types of Knee Implants

1) Which knee implant lasts the longest?
Implant life depends on surgical technique, implant type, patient activity, and weight management. Many modern implants last for years when properly chosen and maintained.

2) Is partial knee replacement better than total knee replacement?
Partial knee replacement can be excellent for selected patients with damage in only one compartment. Total knee replacement is better when arthritis is widespread.

3) Cemented vs cementless—what is better?
Cemented is commonly used and highly reliable. Cementless may suit younger patients with good bone quality. Your surgeon decides the best option.

4) Are mobile-bearing implants always better?
Not always. They may be beneficial in selected cases, but fixed-bearing implants work extremely well for most patients.

5) Does implant choice affect recovery time?
Recovery depends more on overall health, muscle strength, physiotherapy, and surgical planning, though some procedures like partial knee replacement may allow quicker recovery.

Final Takeaway

Knee replacement is not just “one implant for everyone.” There are multiple implant types—total, partial, ligament-based designs, fixation methods, and bearing surfaces. The best results come from choosing the right implant based on your knee condition and lifestyle, and getting the surgery done by an experienced specialist.

If you’re planning knee replacement, consult Dr. Deepak Mishra (Asian Hospital, Faridabad) for the most suitable implant selection and a structured recovery plan. Appointment: +91 8287334003.