Knee Prosthesis Types: Which Knee Implant Is Right for You?

Knee prosthesis types come in different surgical designs, bearing types, and material combinations, matched to your anatomy and activity level.

This guide explains the types of knee replacement, from total to partial and revision, and compares each implant so you know what to ask your surgeon.

Check out how our doctors perform knee replacement surgery in this video

Knee Replacement Prosthesis Types & Classification

Knee prosthesis types come in different surgical designs, bearing types, and material combinations, chosen to fit your anatomy and activity level.

Surgical scope: how much of the knee gets replaced.

Bearing and stability designs: how the plastic insert moves and what keeps the joint stable?

Material combinations: what the two moving surfaces are made of?

4 Types of Knee Implants Material: What Rubs Against What

Ceramic-on-plastic

Ceramic-on-plastic (ceramic-on-polyethylene) knee implants are a highly durable and hypoallergenic alternative to traditional metal-on-plastic designs. In this configuration, the femoral component (the curved part that caps the end of the thigh bone) is made of a high-strength medical ceramic, while the tibial insert (the cushion that mimics cartilage) is made of a dense plastic called ultra-high-molecular-weight polyethylene.

Metal-on-Plastic Knee Implants

Metal-on-plastic is the most common and traditional knee implant design, with a metal femoral component gliding over a high-grade plastic (polyethylene) spacer.

Metal caps the femur and tibia, using strong metals like cobalt-chromium or titanium. A polyethylene spacer sits between them, acting as artificial cartilage for smooth, cushioned movement. This design has the longest track record of safety, remains the most cost-effective option, and holds up well over years of daily use.

Ceramic-on-Ceramic Knee Prosthesis

A ceramic knee prosthesis is an advanced joint replacement device made from high-performance ceramic materials (such as alumina matrix composites) or ceramic-coated metals.

The %medicalexpo 80816 knee prosthesis ceramic 16365035 options use ceramic or ceramic-composite components instead of cobalt-chromium or titanium. They're mainly chosen for patients with a confirmed metal allergy or sensitivity, offering a smooth, scratch-resistant alternative.

Metal-on-Metal Implants

Metal-on-metal (MoM) contact in total knee replacements is uncommon because standard knee implants use a medical-grade plastic (polyethylene) insert as a cushioning bearing surface between the metal components.

Knee Replacement Surgery Scope: Total, Partial, and Revision

Knee replacement surgery replaces damaged, painful joint surfaces with durable metal and plastic components, delivering lasting relief and getting you moving freely again.

Total Knee Replacement

Knee replacement surgery can relieve pain and restore function to a knee joint that's seriously damaged, often by arthritis.

And as for the total knee replacement procedure, it is the most common option worldwide. The surgeon resurfaces the damaged ends of the thigh and shin bones, and often the kneecap, with implants. It's usually recommended when arthritis has worn down several parts of the joint.

Partial Knee Replacement: Unicompartmental and Patellofemoral

A partial knee replacement is a surgery that fixes only the damaged part of your knee joint while leaving the healthy bone and ligaments alone. Partial knee replacement comes in two main types:

1. Unicompartmental replacement replaces the worn surface on either the inner or outer side of the knee with metal and plastic components.
2. Patellofemoral replacement replaces only the back of the kneecap and the groove in the thigh bone where it glides.

Revision Knee Replacement

A revision knee replacement is a specialized surgical procedure to replace all or part of a failing artificial knee implant. Revision knee replacement follows three steps:

1. The surgeon removes the worn implant
2. Then rebuilds any lost bone using metal augments, cones, or grafts.
3. And finally, he fits specialized new components. Longer stems often reach deeper into healthy bone for extra stability and support.

Knee Replacement Prosthesis Types by Ligament Support

knee replacement implant types differ in how they support the ligaments around the joint, mainly through the posterior cruciate ligament (PCL) and collateral stability.

Cruciate-Retaining (CR) Knee Implants

Cruciate-Retaining (CR) knee implants are artificial joint devices that keep your natural posterior cruciate ligament (PCL).

Cruciate-retaining (CR) implants work with your own anatomy. The surgeon keeps your original PCL rather than removing it, cuts away less of the thigh bone than other designs, and the artificial parts rely on your remaining tissue to guide movement.

Keeping the PCL helps the knee move and feel much closer to a natural joint. These implants also show high long-term survival rates and a low risk of loosening, while preserving the ligament reduces shear forces placed on the bone.

Posterior-Stabilized (PS) Knee Implants

Posterior-Stabilized (PS) knee implants are total knee replacement devices that substitute for a damaged or removed posterior cruciate ligament (PCL) using a built-in mechanical post and cam system.

Posterior-stabilized (PS) implants replace the PCL's role with a plastic post that fits into a femoral cam, guiding motion when the knee bends. Surgeons choose them for a damaged or missing ligament, severe deformity, or when joint balancing is difficult.

Constrained and Hinged Knee Prostheses for Complex Cases

Constrained knee replacement and hinged knee prostheses provide mechanical stability when severe ligament damage, bone loss, or deformity makes standard knee replacement impossible.

Knee Replacement Implants Bearing and Stability Designs

Knee replacement implants are categorized by how they attach to the bone (fixation) and how they allow the joint to move and handle stability (movement and design).

Cemented, Cementless, and Hybrid Fixation

Cemented knee replacement vs cementless and hybrid fixation are the three primary methods surgeons use to attach artificial joint replacement parts to your natural bone.

1. Cemented fixation uses medical-grade acrylic bone cement between the bone and metal implant, hardening within about 10 minutes for immediate stability. Best suited for older people or those with weaker bone density who need fast, reliable fixation right away.
2. Cementless fixation (press-fit) uses a textured, porous metal implant wedged tightly against the bone with no cement. Living bone tissue grows into its surface over time, forming a permanent bond. Best for younger, active people with strong bone quality.
3. Hybrid fixation combines both techniques: one side of the joint is cemented while the other is left cementless, often pairing a cemented tibial component with a cementless femoral one for balanced, long-lasting stability.

Fixed-Bearing vs Mobile-Bearing Knee Implants

Fixed-bearing and mobile-bearing knee implants offer comparable long-term survival rates and clinical outcomes, though mobile-bearing designs provide slightly more natural axial rotation at a higher financial cost.

1. In the fixed-bearing implants, the plastic insert locks tightly into the metal tibial baseplate and cannot move. They are easier and cheaper to implant with no dislocation risk, though contact stress can cause later polyethylene wear.
2. Meanwhile, in the case of mobile-bearing implants, the plastic insert rotates or slides slightly, mimicking natural meniscus movement. This reduces joint stress and adds rotation, but costs more and needs stronger ligaments to avoid dislocation.

How to Choose the Right Knee Implant

Choosing the right knee implant depends on matching your specific age, activity level, anatomy, and extent of joint damage with guidance from your orthopedic surgeon.

Partial vs. Total Replacement

1. Partial knee replacement suits damage limited to one compartment, with a smaller incision and quicker recovery.
2. Total knee replacement covers multiple compartments and holds up better for widespread arthritis or older, less active patients.

Material Composition

1. Implants pair strong metal alloys, such as titanium or cobalt-chromium, with medical-grade polyethylene plastic spacers.
2. Ceramic or oxinium alternatives, along with special coatings, are available for patients with a known metal allergy, such as nickel or cobalt.

Ligament Retention Vs. Substitution

1. Cruciate-retaining (CR) designs preserve your natural posterior cruciate ligament, giving a more natural feel during activities like climbing stairs.
2. Posterior-stabilized (PS) designs replace the ligament's role with a built-in mechanical post for added stability.

Fixation Method

1. Cemented fixation is the standard, reliable choice, especially for patients over 55 with lower bone density.
2. Cementless (press-fit) fixation depends on bone growing into a porous surface and is usually reserved for younger, active patients with strong bone quality.

Surgical Precision

Modern techniques like robotic-assisted surgery help fine-tune implant sizing and alignment to your specific anatomy. Experts note that matching the design to your anatomy matters more than the implant brand itself.

Your Anatomy, Age, and Lifestyle

The right implant depends on you: your ligament condition and knee anatomy, your age and bone quality, and how active your lifestyle is. Together, these factors guide your surgeon toward the design, fixation, and stability level that fits your body best.

Choosing Turkey Luxury Clinics for Knee Replacement

Choosing Turkey Luxury Clinics for your knee replacement means working with experienced orthopedic surgeons who match your implant type to your exact anatomy, using modern techniques like robotic-assisted precision.

You get thorough evaluation, transparent guidance through every implant option, and dedicated support from consultation to recovery.

Reach out today to schedule your FREE personalized assessment and take the first step toward pain-free movement.

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