Knee Post-Operative Rehabilitation
Knee Replacement
- Post-operative swelling and stiffness
- Difficulty fully straightening or bending the knee
- Weak quadriceps
- Difficulty with stairs
Quick answer
Rehabilitation after a total knee replacement restores movement, strength and walking. The first six weeks focus on regaining extension and bend and reactivating the quadriceps; strengthening continues for months. Most people walk comfortably by six to eight weeks and keep improving up to a year.
Typical recovery
3–6 months, with continued gains to a year
A typical range, not a promise — how long it takes depends on how long it has been going on, and on what you do between appointments.
A knee replacement removes the damaged joint surfaces and replaces them. What it does not do is restore the strength lost during the years of limping beforehand, or the movement lost in the weeks afterwards. That is what rehabilitation is for, and it determines much of the final result.
The two things that matter most early
Full extension. A knee that cannot straighten completely produces a permanent limp and overloads everything else. Extension is harder to regain later than bend, so it is prioritised from day one.
Quadriceps activation. The thigh muscle shuts down after surgery. Getting it firing early prevents months of weakness.
The phases
Weeks 0–2. Swelling control, extension, gentle bending within the permitted range, walking with an aid, and preventing clots. Often delivered at home.
Weeks 2–6. Progressing bend towards 110–120 degrees, weaning off the walking aid, normalising gait, and beginning strengthening.
Weeks 6–12. Progressive strengthening, stairs, balance work, and building walking distance.
3–6 months and beyond. Continued strengthening and return to activities such as cycling, swimming and walking distances.
Realistic expectations
Most people walk comfortably without an aid by six to eight weeks. Improvement continues for a year. Kneeling is often uncomfortable long-term. Some awareness of the joint — a sense that it is not quite the original knee — is normal and not a sign of a problem.
High-impact activity such as running is generally discouraged, but cycling, swimming, walking and golf are all realistic.
When to contact the surgical team
Increasing redness, heat, fever, wound discharge, or calf pain and swelling need prompt medical attention rather than a physiotherapy session.
Medically reviewed by Pooja Tyagi, BPT, MPT, Orthopaedic Physiotherapy · Last reviewed September 2026