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KNEE REPLACEMENT
Partial vs Total Knee Replacement: What’s the Difference for Rehab?
Your surgeon said “partial” or “total” and you nodded along. Here’s what the two surgeries actually involve, and why your rehab plan looks the way it does.
What Each Surgery Actually Does
A total knee replacement (TKR) resurfaces the entire joint with metal and plastic components. The end of the femur (thigh bone), the top of the tibia (shin bone), and usually the underside of the kneecap. Think of it as replacing the whole wearing surface, all three “compartments” of the knee (inner, outer, and front).
A partial knee replacement (technically a unicompartmental knee replacement) replaces just one compartment, usually the inner (medial) one, which is where arthritis most often starts. The rest of the joint (the outer compartment, the kneecap surface, the cruciate ligaments) stays untouched. Less is removed, less is replaced.
Totals are by far the more common operation. Most knee replacements performed are totals. If you’re having a knee replacement, odds are it’s a total, and most of what you’ll read about knee replacement rehab is written with totals in mind.
Who Gets a Partial
Partials are offered to a narrower group. Roughly speaking, people whose arthritis is genuinely confined to one compartment of the knee. The typical candidate:
- Arthritis in one compartment only: the inner compartment is worn out, but the rest of the joint looks good on imaging
- Intact ligaments: the ACL and other stabilizing ligaments are in decent shape (the surgery relies on them)
- Correctable alignment: the leg isn’t significantly bowed or knock-kneed
- Not severe stiffness: the knee still has reasonable range of motion
If the arthritis is more widespread, the ligaments are damaged, or there’s major deformity, a partial won’t work and a total is the right call. This is the surgeon’s judgment call based on your scans and exam. It’s not a preference you shop for.
Frankly: don’t chase a partial. Some patients arrive hoping for the “smaller” surgery, as if less replacement is always better. But a partial in a knee that really needs a total is worse than a total. It fails faster and buys you a second operation. The right surgery is the one that matches your joint, not the one that sounds less invasive.
Key Takeaway: A partial replaces one compartment of the knee. A total replaces all three. Do not chase the partial just because it sounds smaller. If your joint needs a total, a partial fails faster and buys you a second surgery. Rehab looks similar either way. The right surgery is the one that matches your joint.
How Rehab Differs (And How It Doesn’t)
Here’s the part most people actually want: if you had the smaller surgery, is the rehab easier? Sort of.
Where partials tend to have it easier
Because less tissue is cut and the natural ligaments are preserved, partial-knee patients often report less pain in the first weeks, get range of motion back a bit faster, and the knee tends to feel more “natural” sooner. It’s still mostly your own joint. The hospital stay is typically shorter, and many people are walking more comfortably, sooner.
Where the rehab is identical
Everything else runs on the same playbook: range of motion first, then strength. Swelling control, quad activation, heel props, the stationary bike, progressive loading. The exercises don’t change because the goals don’t change. A partial knee still needs full extension before you chase strength, still needs its quad rebuilt, and still benefits from guided 1-on-1 rehab once you’re home. If you want the week-by-week shape of that recovery, our week-by-week recovery guide covers what each phase actually feels like.
Bottom line: a partial may give you a smoother first month, but it doesn’t buy you a shorter rehab. The work is the work.
Which Lasts Longer
Total knee replacements are known for longevity. The implants routinely last 15–20+ years depending on age, activity, and weight. (If you want the full breakdown on that, we wrote about how long a knee replacement lasts separately.)
Partials are a bit more of a trade: they preserve more of your natural knee, but because the rest of the joint is still original equipment, arthritis can progress in the untouched compartments. That means a partial may need to be revised to a total sooner than a total would need revising. It’s not a flaw in the surgery. It’s the nature of leaving part of an arthritic joint in place.
Getting Back to Activity
One of the most common questions we get: what can I actually do with the new knee? Here’s the general guidance. Your own surgeon’s protocol always wins over any list on the internet, because your specific implant and situation matter.
High-impact or twisty (generally advised against):
- Running / jogging
- Basketball
- Soccer
- Singles tennis (the stop-start and pivoting are the problem)
Higher-risk (ask your surgeon):
- Downhill skiing. Some surgeons clear experienced skiers, some don’t. It’s a personal decision between you and your surgeon, not a default yes.
Good to go (once rehab clears you):
- Walking
- Cycling
- Swimming
- Golf
- Doubles tennis
- Hiking
The pattern is straightforward: repetitive impact and sharp twisting are what wear implants down and loosen them. Smooth, low-impact movement is what keeps them happy. And keeps you moving, which is the whole point of the operation.
Frequently Asked Questions
Can I request a partial instead of a total?
You can ask. But the surgeon decides based on your joint. A partial only works when arthritis is confined to one compartment with intact ligaments. If your knee needs a total, a partial would fail early. Trust the imaging, not the appeal of a smaller operation.
Is rehab really the same for both?
The principles are: full range of motion first, then strength, same exercises, same milestones. Partials often get there a little faster with a bit less early pain, but the program and the timeline shape are the same.
Which one will my surgeon recommend?
In most cases, a total. They’re the more common operation by a wide margin and they’re the right answer for most arthritic knees. Partials are for the subset of patients whose arthritis is truly limited to one compartment.
When do I see my own physiotherapist vs. the hospital?
The hospital’s outpatient physio pathway comes first. You go through that, then continue with your own physiotherapist after the pathway ends. Your own physio handles the longer tail of recovery: full strength, return to activity, and everything the short hospital pathway doesn’t have time for.
Recovering From a Knee Replacement?
1-on-1 post-surgical knee rehab in Richmond, BC. From the hospital pathway to full activity.