A total knee replacement reliably relieves arthritic pain, and satisfaction with the operation is high. But the result you end up with depends heavily on the rehabilitation, and specifically on how much range of motion is regained in the first six weeks.
This is the part patients are least prepared for. The early weeks are uncomfortable and demand daily work at a point when you feel least like doing it. Knowing that in advance makes it considerably easier to get through.
Before surgery
Strengthening the quadriceps beforehand shortens recovery measurably — the stronger the leg going in, the less there is to rebuild. Learn to use crutches before the operation rather than on the day, and sort the house out in advance: a clear path to the bathroom, loose rugs up, a firm chair with arms, and anything you use daily moved to waist height.
Days 0–7: in hospital and the first week
You will usually be up and walking with a frame or crutches within a day. The early priorities are pain and swelling control, getting the knee fully straight, and starting to bend it.
Ice and elevation are not optional in this period — swelling is what physically blocks the knee from bending, and controlling it is the most useful thing you can do. Elevate with the ankle above the hip, and avoid propping a pillow under the knee, which encourages it to settle in a bent position.
Expect ankle pumps, quadriceps sets, heel slides and assisted bending several times a day.
Weeks 1–6: the window that matters
This is where the eventual range of motion is decided. The working targets are full extension — the knee completely straight — and around 90 degrees of bend by two weeks, progressing towards 110 to 120 degrees by six.
Full straightening takes priority over bending. A knee that does not fully straighten changes how you walk permanently and loads the other joints; it is also the harder of the two to recover late.
Exercise little and often, four to five short sessions a day rather than one long one, and take pain relief before your session rather than after. Stiffness that sets in during these weeks can require a further procedure to release, which is why physiotherapists push hardest here.
Weeks 6–12: strength and normal walking
Most people are off crutches by now and walking unaided. Work moves to strengthening — step-ups, sit-to-stand, stationary cycling, static bike progressing to resistance, and balance work.
Swelling that comes and goes with activity is normal for several months and is not a setback. It is a load signal: reduce the session slightly, elevate, and continue.
Months 3–12: the long tail
By three months most people are walking comfortably, managing stairs, and back to normal daily activities. Driving usually resumes somewhere between four and eight weeks depending on which knee and your surgeon's advice.
Improvement continues for a full year, and often beyond. Low-impact activity — walking, cycling, swimming, gentle hiking — is encouraged long term. Running and high-impact sport generally are not, because they shorten the life of the implant.
When to call someone
Contact your surgeon promptly rather than waiting for your next appointment if you have:
- Fever, or increasing redness, heat or discharge from the wound
- Calf pain, tenderness or swelling, particularly one-sided — this needs same-day assessment
- Sudden increase in pain or swelling after it had been settling
- Range of motion going backwards rather than forwards
The short version
Do the exercises, chase full straightening early, control the swelling, and do not compare your progress to someone else's — recovery rates vary widely and it means very little in the first few weeks.
If your range of motion has stalled, or you are past six weeks and still walking with a limp, get it looked at rather than waiting. Both are usually fixable, and both are much easier to fix early.
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