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Knee · Knee Osteoarthritis

Knee Arthritis

Wear-and-load changes in your knee have made the joint and the tissues around it more sensitive. It’s common with age, and it does NOT mean your knee is ‘bone on bone’ or beyond help.

The joint has become deconditioned and sensitised over time. Guidelines put exercise and education first, ahead of everything else, because it is the single best-evidenced treatment. Stronger muscles offload and support the joint.

How it typically shows up

Activity-related knee pain in someone 45 or over, with brief (<=30 minute) morning stiffness, often crepitus and gradual onset, diagnosed clinically without imaging. Core treatment is exercise + education (+ weight management if overweight).

How long recovery takes

Exercise reliably brings the pain down and gets the knee working better. Most people feel steadily stronger and steadier over a few months of regular sessions, then keep it up on their own.

The phased recovery approach

  1. Phase 1 · 1–3 weeks

    Calm

    Get the knee moving gently and learn that a bit of ache and the odd flare are safe, not damage.

    What you get back: easier moving with less daily ache.

    • Hamstring Stretch — 1–2 sets × 10–20s hold · Sit or stand with one leg straight out in front of you.
    • Supported Mini-Squat — 2–3 sets × 8–12 reps · Stand holding a counter for support with your feet shoulder-width apart.
    • Chair Sit-to-Stand — 2–3 sets × 8–12 reps · Sit tall toward the front of a sturdy chair.
    • Quad Set — 2–3 sets × 8–12 reps · Sit or lie with your leg straight out in front of you.

  2. Phase 2 · 3–6 weeks

    Rebuild

    Build up leg strength so the muscles carry more of the load and the joint feels easier.

    What you get back: a comfortable sit-to-stand.

    • Low Step-Up — 2–3 sets × 8–12 reps · Stand facing a low step.
    • Squat to Chair — 2–3 sets × 8–12 reps · Stand in front of a chair with your feet shoulder-width apart.
    • Seated Knee Extension — 2–3 sets × 8–12 reps · Sit tall in a chair with your feet on the floor.
    • Leg Press — 2–3 sets × 8–12 reps · Sit in the leg press with your feet flat on the platform.

  3. Phase 3 · 2–6 weeks

    Back to walking

    Grow your walking time while the strength you built keeps the joint comfortable.

    What you get back: walking and daily life, comfortably.

    • Graded Walking — 1 sets × 1200–1800s hold · Start walking at a comfortable, easy pace.
    • Low Step-Up — 2–3 sets × 10–15 reps · Stand facing a low step.
    • Chair Sit-to-Stand — 2–3 sets × 10–15 reps · Sit tall toward the front of a sturdy chair.
    • Squat to Chair — 2–3 sets × 10–15 reps · Stand in front of a chair with your feet shoulder-width apart.

  4. Phase 4 · 2–6 weeks

    Walk, land, and run readiness

    Get the knee ready for brisk walks and gentle landings before you try any run-walk.

    What you get back: a brisk walk and controlled landings without a flare.

    • Graded Walking — 1 sets × 1200–1800s hold · Start walking at a comfortable, easy pace.
    • Low Step-Up — 2–3 sets × 8–12 reps · Stand facing a low step.
    • Slow Step-Down — 2–3 sets × 8–12 reps · Stand on a step with one foot at the edge.
    • Seated Knee Extension — 2–3 sets × 15–20 reps · Sit tall in a chair with your feet on the floor.

  5. Phase 5 · 3–6 weeks

    First runs

    Short run-walk intervals on top of your walking base, backing off if the knee flares the next day.

    What you get back: your first jogs without a next-day flare.

    • Chair Sit-to-Stand — 2–3 sets × 10–15 reps · Sit tall toward the front of a sturdy chair.
    • Low Step-Up — 2–3 sets × 10–15 reps · Stand facing a low step.
    • Leg Press — 2–3 sets × 10–15 reps · Sit in the leg press with your feet flat on the platform.
    • Seated Knee Extension — 3 sets × 15–20 reps · Sit tall in a chair with your feet on the floor.

  6. Phase 6 · 3–8 weeks

    Back to running

    Trade the walk breaks for an easy continuous run, backing off only if the knee flares the next day.

    What you get back: an easy continuous run without a next-day flare.

    • Hamstring Stretch — 1–2 sets × 20–30s hold · Sit or stand with one leg straight out in front of you.
    • Low Step-Up — 2–3 sets × 10–15 reps · Stand facing a low step.
    • Leg Press — 2–3 sets × 10–15 reps · Sit in the leg press with your feet flat on the platform.
    • Chair Sit-to-Stand — 2–3 sets × 10–15 reps · Sit tall toward the front of a sturdy chair.

  7. Phase 7 · 3–8 weeks

    Back to the gym

    Build your lower-body lifts back up, backing off only if the knee flares the next day.

    What you get back: lower-body training without a next-day flare.

    • Backpack Box Squat — 3–4 sets × 8–12 reps · Wear a backpack loaded with books and stand in front of a chair or box.
    • Leg Press — 3–4 sets × 8–12 reps · Sit in the leg press with your feet flat on the platform.
    • Loaded Box Squat — 3–4 sets × 8–12 reps · Stand in front of a box or chair, holding a backpack or household load close to your chest.
    • Chair Sit-to-Stand — 3–4 sets × 8–12 reps · Sit tall toward the front of a sturdy chair.

Exact exercises, sets and progression depend on your severity, equipment and goal — this is the shape of the program, not a one-size prescription.

What matters while you recover

  • Exercise is the treatment, and it’s safe

    Knee arthritis is common and treatable. Exercise is the first-line treatment for almost everyone, and stronger muscles protect the joint rather than wear it out.

  • Flares are okay, not damage

    Pain up to moderate while you exercise is fine, and a flare that settles to baseline within a day is expected, not harm. Past that, ease the load, keep moving.

Common questions

Will exercise wear the joint out faster?
No, the opposite. Strengthening offloads and protects the joint, and guidelines make exercise the core treatment for almost everyone with knee OA.
Is it okay if it hurts a bit while I exercise?
Yes, up to about 5/10 is acceptable, and a flare that settles back to baseline within 24 hours is fine. Flares aren’t damage. If pain exceeds that, reduce the load rather than stopping.
What matters most for recovery?
Regular strength work, steady walking or cycling, and pacing flares are the first-line treatment. Judge progress by easier daily tasks and more activity tolerance, not by chasing a perfect-feeling joint.

Go deeper

Related knee conditions

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