Partial Knee Replacement vs. Total Knee Replacement: Is a Partial Knee Replacement Better?

rcone15
2 days ago
5 min read

By Ryan Cone, MD. Orthopedic Surgeon | Joint Replacement Specialist | Atlanta, Georgia

If you've been told you need a knee replacement, one of the first questions you should ask is:

"Do I actually need a total knee replacement?"

For many patients, the answer is no.

When arthritis is isolated to only one part of the knee—most commonly the inside (medial) compartment—a partial knee replacement (also called a unicompartmental knee replacement) can provide excellent pain relief while preserving much of your natural knee.

Modern research has shown that, in the right patient, partial knee replacement can provide faster recovery, a more natural-feeling knee, higher patient satisfaction, and similar long-term function compared with a total knee replacement.

What Is a Partial Knee Replacement?

A healthy knee has three compartments:

Medial (inside)
Lateral (outside)
Patellofemoral (behind the kneecap)

Many patients with osteoarthritis have severe wear in only one compartment, while the remaining cartilage and ligaments remain healthy.

Instead of replacing the entire knee, a partial knee replacement resurfaces only the damaged portion, preserving:

Healthy cartilage
The ACL and PCL (in most cases)
Most of the natural bone
Normal knee mechanics

Because less tissue is disrupted, recovery is often quicker and patients frequently describe the knee as feeling "more like their own."

Who Is a Candidate?

You may be an excellent candidate if you have:

Arthritis confined to one compartment
Intact knee ligaments
Good range of motion
Correctable deformity
Persistent pain despite conservative treatment

A careful physical examination along with weight-bearing X-rays—and occasionally MRI imaging—helps determine whether a partial replacement is appropriate.

Not everyone qualifies, but many patients who assume they need a total knee replacement are pleasantly surprised to learn they may be candidates for a less invasive option.

Partial vs. Total Knee Replacement

Partial Knee Replacement	Total Knee Replacement
Replaces one compartment	Replaces all three compartments
Preserves healthy cartilage and bone	Removes all joint surfaces
Smaller incision	Larger operation
Less blood loss	More blood loss
Less postoperative pain	More postoperative discomfort
Faster recovery	Longer recovery
More natural knee mechanics	Excellent pain relief but altered mechanics
Easier revision if needed later	Revision surgery is generally more complex

Recovery: Partial Knee Replacement vs. Total Knee Replacement

One of the greatest advantages of partial knee replacement is recovery.

Because the surgery preserves much of the normal anatomy, patients typically experience:

Less swelling
Less pain
Better early motion
Earlier return to walking
Quicker return to daily activities

Many patients are:

Walking the day of surgery
Using a cane—or no assistive device—within days to a few weeks
Driving sooner (depending on the operative side and medications)
Returning to golf, pickleball, cycling, and travel earlier than many total knee replacement patients

Although every recovery is unique, patients generally regain function more quickly after a partial knee replacement than after a total knee replacement. Randomized studies have consistently demonstrated shorter hospital stays and faster early recovery following partial knee replacement.

Does a Partial Knee Feel More Natural?

One of the most common comments I hear from patients is:

"It still feels like my knee."

There is a reason for that.

A partial knee replacement preserves the knee's normal ligaments and much of its native anatomy.

Studies evaluating patient-reported outcomes have demonstrated improvements in measures such as the Forgotten Joint Score, which reflects how often patients forget they even have an artificial joint during daily activities. Because more of the normal knee is preserved, many patients report a knee that feels more natural during walking, climbing stairs, and recreational activities.

What Does the Research Show?

High-quality orthopedic literature has compared partial and total knee replacement for decades.

Some of the most important findings include:

Faster Recovery

Randomized clinical trials have shown:

Shorter hospital stays
Faster restoration of motion
Earlier functional recovery

following partial knee replacement compared with total knee replacement.

Excellent Patient Satisfaction

The landmark TOPKAT randomized trial involving more than 500 patients found that both procedures produced excellent outcomes, but patients undergoing partial knee replacement reported higher satisfaction on several patient-reported measures while also demonstrating greater cost-effectiveness.

Similar Long-Term Function

Five-year and ten-year follow-up studies demonstrate that appropriately selected patients undergoing partial knee replacement achieve pain relief, function, and quality of life comparable to total knee replacement.

What About Implant Longevity?

One concern patients often hear is that partial knee replacements "don't last."

This is an oversimplification.

Earlier generations of implants had higher failure rates, but modern implants, improved patient selection, and advances in surgical technique have dramatically improved durability.

Today's evidence shows that when performed in appropriately selected patients by experienced knee replacement surgeons, partial knee replacement offers excellent survivorship while preserving the option for conversion to a total knee replacement if arthritis develops elsewhere in the knee in the future.

Is Partial Knee Replacement Right for You?

The best knee replacement is not the biggest operation—it's the operation that best matches your arthritis.

If your arthritis is limited to one compartment, a partial knee replacement may allow you to:

Recover faster
Experience less pain
Preserve normal knee motion
Maintain more natural knee function
Return to the activities you enjoy sooner

The key is careful evaluation and selecting the right procedure for the right patient.

Frequently Asked Questions

Is a partial knee replacement less painful?

Generally, yes. Because less bone and soft tissue are disrupted, most patients experience less postoperative pain and swelling than after a total knee replacement.

Will I recover faster?

Most patients recover more quickly following a partial knee replacement, often returning to walking, driving, work, and recreational activities sooner than patients undergoing total knee replacement.

Does a partial knee replacement last as long?

Modern studies demonstrate excellent durability when the procedure is performed in appropriately selected patients. Long-term outcomes continue to improve with advances in implant design and surgical technique.

Can a partial knee replacement become a total knee replacement later?

Yes. If arthritis develops in another compartment years later, a partial knee replacement can usually be revised to a total knee replacement.

Schedule a Consultation

If you're experiencing knee pain that limits your quality of life, don't assume a total knee replacement is your only option.

A comprehensive evaluation—including an examination and specialized X-rays—can determine whether a partial knee replacement may provide the best outcome for your specific knee arthritis.

Every patient deserves an individualized treatment plan designed to preserve as much of the natural knee as possible while restoring comfort, mobility, and function.

Selected References

Beard DJ, et al. Total versus Partial Knee Replacement Trial (TOPKAT). Randomized clinical trial with 5-year outcomes. Health Technology Assessment / The Lancet.
Hamilton TW, et al. Early Results of a Randomized Controlled Trial of Partial Versus Total Knee Arthroplasty. The Journal of Arthroplasty.
NEJM Journal Watch. Partial vs. Total Knee Arthroplasty—10-year follow-up review.
American Academy of Orthopaedic Surgeons (JAAOS). Current evidence supporting patient selection and outcomes after knee arthroplasty.