What to expect from rehabilitation after knee replacement surgery, from the first week through to returning to normal activity.
A knee replacement is a highly successful operation, but the surgery is only half of the outcome. What determines how well the new joint actually works is the rehabilitation that follows — and specifically, how early and how consistently it is done.
Weeks 1–2: protect and mobilise
The priorities are controlling swelling, regaining basic knee bending and straightening, and walking safely with a frame or crutches. Full straightening is the critical goal in this period; a knee that does not fully straighten early is considerably harder to correct later.
Weeks 3–6: range and strength
Bending should progress toward 90 degrees and beyond. Quadriceps strengthening becomes the focus, since this muscle switches off dramatically after surgery. Most patients transition from crutches to a stick during this window.
Weeks 6–12: function
Walking normalises, stairs become manageable, and strengthening progresses to standing and weight-bearing exercises. Most people return to driving and light daily activity in this period.
Months 3–12: consolidation
Improvement continues well beyond the point most patients expect. Strength, endurance and confidence keep developing for up to a year. Low-impact activity — walking, cycling, swimming — is strongly encouraged.
The most common mistake
Patients who stop their exercises once the pain settles at around six weeks consistently end up with a stiffer, weaker knee than those who continue. Comfort is not the same as recovery.
This article is general information, not a diagnosis. Symptoms that persist, worsen, or involve numbness or weakness should be assessed in person. Book an assessment if you are unsure.