Partial Knee Replacement Recovery
Unicompartmental Knee Arthroplasty
What a partial knee replacement is
The knee has three compartments — inner, outer, and behind the kneecap. A partial replacement resurfaces only the one that is worn, leaving the rest of the joint, and importantly the ligaments inside the knee, exactly as they are. Most often it is the inner compartment.
Why it is chosen
It suits a knee where the arthritis is confined to one compartment and the ligaments are intact. Not every knee qualifies, and the assessment is partly on imaging and partly on what your surgeon finds. Where it does suit, it offers a smaller operation for the same problem.
How it differs from a total knee replacement
Recovery is generally faster and less painful, the knee bends more easily sooner, and most people say it feels more like their own knee — largely because the ligaments that give a knee its sense of position are still there. Swelling is usually less pronounced and settles sooner.
What that means for the first weeks
Most people are walking with less support sooner than after a total knee, and the daily struggle for range of movement is generally milder. That does not mean no work — bending and straightening still need attention — but the window feels less like a battle.
Swelling
There is still swelling, and it still fluctuates with activity, but it is usually less than after a total replacement and settles over weeks rather than many months. Ice and proper elevation help in the same way.
Range of motion
Bend usually returns more readily, and many people reach a comfortable everyday range within the first few weeks. Full straightening still matters as much as bending, and is still the part more easily neglected.
The incision
The incision is smaller than for a total replacement and sits over the affected side of the knee. It stays tender for a couple of weeks. A patch of numbness beside it is common and generally fades over months.
Pain and sleep
Pain is generally highest in the first week and eases steadily. Disturbed sleep is common early but usually shorter-lived than after a total knee. Most people move off stronger medication within one to two weeks.
Walking and stairs
Most people are up and walking the same day, often with a stick rather than a frame, and stairs generally come more easily than after a total replacement. Walking without aids often comes within a couple of weeks.
Driving
Driving generally becomes reasonable once you are off stronger pain medication, can bend enough to get in comfortably, and could perform an emergency stop without hesitating. For a right knee that is commonly two to four weeks — usually sooner than after a total replacement.
Returning to work
Desk-based work is often possible within two to four weeks. Work involving standing or climbing takes longer but generally returns sooner than after a total knee. Your surgeon will guide the timing.
Kneeling
Kneeling is often more comfortable after a partial replacement than a total one, though it varies and is not guaranteed. It does not damage the implant.
Physical therapy
Therapy focuses on regaining movement, rebuilding quadriceps strength, and normalising walking. It progresses faster than after a total knee, but the quadriceps still need deliberate work — they weaken quickly and are what make stairs and getting out of chairs feel easy again.
How the first year usually unfolds
The first two weeks centre on comfort, swelling, and early movement. Weeks two to six generally bring walking without aids and most daily activity. From six to twelve weeks strength builds and the knee starts feeling unremarkable. Most people are doing what they want by around three months, with small gains continuing through the year.
Staying in touch with your care team
Recovery varies with how the knee was before surgery and how the swelling behaves. Your own surgeon knows those details and what to expect from your particular knee. If something about your recovery is worrying you or does not match what is described here, contact your care team — they would far rather hear from you.
Exercises for Partial Knee Replacement
An illustrated, phase-by-phase exercise program for this procedure. View the Partial Knee Replacement exercise program.
Recovery education · Condition guides · Exercise programs
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This guide is general education and doesn't replace evaluation by a licensed provider. Recovery and treatment vary by person — follow the guidance of your own surgeon or care team.