TKR Exercises & Rehab Protocol: The Programme I Give My Patients
After a total knee replacement, the exercises are not an optional extra — they are the treatment. The operation gives you a new joint surface; the exercises decide how well it bends, straightens and carries you. Here's the programme I use, stage by stage.
What are TKR exercises?
TKR stands for total knee replacement. TKR exercises are the structured rehab programme that follows surgery, with three jobs in strict order of priority:
- Get the knee straight (full extension) — the single most important early goal.
- Get the knee bending (flexion) — aiming for roughly 90° by 2–3 weeks and onwards from there.
- Get the leg strong — quadriceps, hamstrings and glutes.
The NHS knee replacement guidance is clear that early, regular exercise is central to a good outcome. Always follow your own surgical team's protocol where it differs from anything below.
The programme, stage by stage
Stage 1 — Days 1–14: movement is medicine
- Ankle pumps — 20 reps, hourly. Circulation and swelling control.
- Static quads — push the back of your knee into the bed, hold 5 seconds, 10 reps, several times daily.
- Heel slides — slide your heel towards your bottom, as far as comfortable, 10–15 reps, 3–4 times daily.
- Knee extension stretch — heel propped on a rolled towel, let the knee sag straight for a few minutes, several times daily. Do not skip this one.
Stage 2 — Weeks 2–6: range plus early strength
- Sit-to-stand from a firm chair — 3 sets of 8–10.
- Seated knee bends, using the other leg to gently assist flexion.
- Step-ups onto a low step as comfort allows.
- Walking — little and often, quality over distance.
Stage 3 — Weeks 6–12+: build the engine
- Bridges and glute strengthening work — the hip muscles protect the new knee.
- Mini squats to sit-to-stand progressions, adding depth gradually.
- Static bike — superb for flexion range and low-impact strength.
- Single-leg balance — 30 seconds, building to eyes-closed.
| Stage | Main goal | Typical dose |
|---|---|---|
| Days 1–14 | Full extension, swelling control | Little and often, every 1–2 hours |
| Weeks 2–6 | 90°+ flexion, normal walking | 2–3 focused sessions daily |
| Weeks 6–12+ | Strength and confidence | 3–4 sessions per week, progressive |
The TKR rehab protocol at a glance
If you've been searching for a TKR rehab protocol, or the fuller phrase "knee replacement rehab protocol" — the staged version physiotherapists actually work from — this is the programme above laid out with the milestones attached. One caveat before the table: protocols vary by surgeon and hospital, and where your surgical team's instructions differ from a typical physiotherapy-led pattern like this one, theirs win.
| Stage | Range milestones | Walking | Other goals | Key exercises |
|---|---|---|---|---|
| Days 0–14 | Full extension (knee flat); flexion building towards 90° | Frame or crutches indoors, short and frequent | Swelling control, wound healing, confident transfers | Ankle pumps, static quads, heel slides, towel-propped extension stretch |
| Weeks 2–6 | Hold full extension; flexion past 90° | One crutch or stick, progressing to unaided indoors | Normal walking pattern, stairs with rail, sleep improving | Sit-to-stand, assisted seated knee bends, low step-ups, daily walks |
| Weeks 6–12 | Flexion towards 110–120° | Unaided, increasing distance outdoors | Strength, balance, confidence on slopes and stairs | Bridges and glute work, mini squats, static bike, single-leg balance |
| Months 3+ | Maintain full extension and best flexion | Normal — pace and distance limited by fitness, not the knee | Return to cycling, swimming, golf, doubles tennis; ongoing strength habit | Progressive gym or home strength work, activity-specific practice |
TKR rehabilitation is milestone-led, not calendar-led: move on when you meet the goals, and flag it to your physiotherapist if a milestone is more than a couple of weeks late — especially full extension. The wider picture of what recovery feels like month by month, beyond the exercises, is in my total knee replacement recovery timeline.
How I coach TKR exercises in clinic
Two rules I repeat more than any others:
- Straight beats bent. A knee that won't fully straighten alters your walking permanently; a knee slow to bend usually catches up. If time is short, do the extension work first.
- Sore but safe. Discomfort during and shortly after exercise is expected. Pain that spikes and stays up for hours, or a knee ballooning overnight, means back off a level — not stop.
Common misconceptions I see in my patients
- "Bending it will damage the implant." The implant tolerates far more than early rehab asks of it. Scar tissue from not bending is the real threat.
- "More exercise is always better." Swelling is the speed limit. Respect it and you'll progress faster overall.
- "I'll stop when it feels normal." Strength lags feel by months. Keep going to at least the 3-month mark — see the full TKR recovery timeline.
FAQ: TKR exercises
How many times a day should I do my TKR exercises?
Early on, short sessions 3–4 times daily beat one long session. From week 6, formal strength work 3–4 times a week plus daily walking is a good rhythm.
What happens if I don't do exercises after knee replacement?
The commonest results are a stiff knee that won't fully straighten or bend past 90°, a persistent limp, and disappointing satisfaction with an implant that is mechanically fine.
When can I kneel after TKR?
Kneeling is usually possible once the wound is fully healed and comfort allows — often around 3 months with padding. It feels odd for many people long-term but is not harmful to the implant.