Kneecap (Patellofemoral) Replacement Recovery
Patellofemoral Arthroplasty
What a patellofemoral replacement is
The knee has three compartments. This operation resurfaces only the one behind the kneecap — the groove on the thigh bone that the kneecap runs in, and usually the back of the kneecap itself. The rest of the joint, including the ligaments inside it, is left alone.
Why it is chosen
It suits a knee where the arthritis is confined to the kneecap compartment and the rest of the joint is healthy. That pattern often causes pain on stairs, getting out of chairs, and after sitting with the knee bent, more than pain with walking on the flat.
How it compares with a total knee replacement
Recovery is generally faster and less painful, and most people say the knee feels more like their own, because the ligaments that give a knee its sense of position are untouched. Swelling is usually less and settles sooner.
What loads this replacement
The kneecap compartment takes its highest loads when the knee is bent under weight — stairs, squatting, getting out of a low chair, and cycling in a high gear. Those activities are progressed deliberately rather than avoided, and it explains why the exercise programme builds quadriceps strength before it builds stairs.
Why the quadriceps matter more here
The quadriceps control the kneecap and how it tracks in its groove. They weaken quickly after surgery, and rebuilding them is what makes stairs and getting out of chairs feel easy rather than effortful. This is the single most useful thing to keep working at.
Swelling
There is swelling, and it fluctuates with activity, but it is usually milder than after a total replacement and settles over weeks rather than many months. Ice and proper elevation help.
Range of motion
Bend usually returns readily, and many people reach a comfortable everyday range within the first few weeks. Full straightening still matters as much as bending and is more easily neglected.
The incision
The incision runs down the front of the knee, generally shorter than for a total replacement. It stays tender for a couple of weeks. A patch of numbness beside it is common and usually 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 walk the same day, often with a stick rather than a frame. Stairs take longer to feel comfortable than flat walking here, because stairs are exactly what loads the resurfaced compartment. That is expected rather than a sign of a problem.
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.
Returning to work
Desk-based work is often possible within two to four weeks. Work involving stairs, kneeling, or squatting takes longer, since those are the loaded positions.
Kneeling
Kneeling puts load directly on the resurfaced area and is often uncomfortable, more so than after a partial replacement of the inner compartment. It does not damage the implant, and a pad helps.
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 quadriceps strength returning. From six to twelve weeks stairs and loaded activities build. Most people are doing what they want by around three months, with strength continuing to improve through the year.
Staying in touch with your care team
Recovery varies with how the knee was beforehand and how the kneecap tracks. Your own surgeon knows those details. 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 Kneecap (Patellofemoral) Replacement
An illustrated, phase-by-phase exercise program for this procedure. View the Kneecap (Patellofemoral) Replacement exercise program.
Recovery education · Condition guides · Exercise programs
Are you a clinician? See how orthopedic practices use JointBooklet.
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.