Partial vs. Total Knee Replacement: Which One Is Right for You?

Discussing whether a partial or total knee replacement is the best option begins with a careful evaluation of your arthritis, anatomy, and goals.

Many patients come to my office asking the same question: "Do I need a partial knee replacement or a total knee replacement?"

The answer depends on where your arthritis is located, how much of your knee is affected, and what will provide the best long-term result. While both surgeries are designed to relieve pain and improve function, they are not interchangeable.

Understanding Knee Arthritis

Your knee has three compartments:

• Medial (inside of the knee)

• Lateral (outside of the knee)

• Patellofemoral (behind the kneecap)

Some people have arthritis affecting only one compartment, while others have damage throughout the knee.

This is the most important factor in determining whether a partial or total knee replacement is appropriate.

What Is a Partial Knee Replacement?

A partial knee replacement (also called a unicompartmental knee replacement) replaces only the damaged portion of the knee while preserving the healthy cartilage, ligaments, and bone.

It may be an option if:

• Arthritis is limited to a single compartment

• Your ligaments are functioning well

• The rest of the knee remains healthy

• Your deformity is relatively mild

Because less bone and tissue are replaced, many patients experience:

• Smaller incision

• Less postoperative discomfort

• Faster early recovery

• More natural-feeling knee motion

• Less blood loss

However, not everyone is a candidate.

What Is a Total Knee Replacement?

A total knee replacement replaces the worn surfaces of all three compartments of the knee when arthritis is more widespread.

This is the most common procedure for patients with advanced knee arthritis.

A total knee replacement may be recommended when:

• Arthritis affects multiple compartments

• Significant deformity is present

• The knee is unstable

• Cartilage damage is extensive

• A partial knee replacement would not provide durable pain relief

Modern knee replacement implants are designed to relieve pain, restore function, and help patients return to many of the activities they enjoy.

Which Type of Knee Replacement Lasts Longer?

Both procedures can have excellent long-term outcomes when performed on the right patient.

The key is choosing the correct operation—not simply the smaller one.

A partial knee replacement performed in someone with arthritis throughout the knee is more likely to fail because untreated arthritis can continue to progress.

Likewise, performing a total knee replacement when a patient is an excellent partial candidate may mean replacing more of the knee than necessary.

Proper patient selection is one of the biggest predictors of success.

How I Decide Which Procedure Is Best

I evaluate several factors, including:

• Your X-rays

• Your physical examination

• The location of your pain

• Ligament stability

• Knee alignment

• Activity level

• Overall health and goals

The goal is not simply to recommend surgery—it's to recommend the surgery that gives you the best chance of long-term pain relief and function.

Robotic-Assisted Knee Replacement

When appropriate, I perform both partial and total knee replacements using robotic-assisted technology.

Robotic assistance allows detailed preoperative planning and helps optimize implant positioning based on your individual anatomy. While the robot does not perform the surgery, it provides real-time information that assists with precision during the procedure.

The Bottom Line

Neither a partial nor a total knee replacement is "better" for everyone.

The best procedure is the one that matches your pattern of arthritis, your anatomy, and your goals.

A careful evaluation by an experienced orthopedic surgeon can determine which option is most likely to provide lasting pain relief and help you return to the activities you enjoy.