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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. The single best-evidenced treatment is exercise and education — stronger muscles offload and support the joint — which guidelines mandate ahead of injections or surgery.

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 over a few weeks — a typical plan is about two sessions a week for six weeks, then keeping it up on your own.

Flare-ups are expected and don't mean you've damaged the joint — ease the load back, you don't stop. If pain keeps climbing week on week despite easing off, get it assessed.

The phased recovery approach

  1. Phase 1 · 1–3 weeks

    Calm

    Start gentle neuromuscular and functional strengthening; learn that some pain and the odd flare are safe.

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

    • Hamstring Stretch — 1–2 sets × 10–20s hold · Hinge from the hips
    • Graded Walking — 1–2 sets × 10–20s hold · Build up walking time gradually
    • Supported Mini-Squat — 2–3 sets × 8–12 reps · Hold a counter, sit back a little way
    • Chair Sit-to-Stand — 2–3 sets × 8–12 reps · Stand up and sit down with control

  2. Phase 2 · 3–6 weeks

    Rebuild

    Progress lower-limb strengthening to offload and support the joint.

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

    • Low Step-Up — 2–3 sets × 8–12 reps · Step up onto a low step, drive through the heel
    • Squat to Chair — 2–3 sets × 8–12 reps · Tap the chair, stand right back up
    • Seated Knee Extension (strength) — 2–3 sets × 8–12 reps · Straighten the knee against gravity (or a light weight)
    • Leg Press — 2–3 sets × 8–12 reps · Within the comfortable range

  3. Phase 3 · 2–6 weeks

    Back to walking

    Maintain strength and aerobic fitness for walking and daily life.

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

    • Graded Walking — 1 sets × 600–1800s hold · Build up walking time gradually
    • Chair Sit-to-Stand — 2–3 sets × 10–15 reps · Stand up and sit down with control
    • Low Step-Up — 2–3 sets × 10–15 reps · Step up onto a low step, drive through the heel
    • Squat to Chair — 2–3 sets × 10–15 reps · Tap the chair, stand right back up

  4. Phase 4 · 3–8 weeks

    Back to running

    Keep the OA strength base while testing a conservative run-walk return under the 24-hour flare rule.

    What you get back: run-walk intervals without a next-day flare.

    • Hamstring Stretch — 1–2 sets × 20–30s hold · Hinge from the hips
    • Chair Sit-to-Stand — 2–3 sets × 10–15 reps · Stand up and sit down with control
    • Low Step-Up — 2–3 sets × 10–15 reps · Step up onto a low step, drive through the heel
    • Leg Press — 2–3 sets × 10–15 reps · Within the comfortable range

  5. Phase 5 · 3–8 weeks

    Back to the gym

    Progress knee-friendly lower-body strength work for gym training while respecting the OA flare rule.

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

    • Leg Press — 3–4 sets × 8–12 reps · Within the comfortable range
    • Loaded Box Squat — 3–4 sets × 8–12 reps · Hold a backpack or household load close to the chest
    • Chair Sit-to-Stand — 3–4 sets × 8–12 reps · Stand up and sit down with control
    • Seated Knee Extension (strength) — 3–4 sets × 10–15 reps · Straighten the knee against gravity (or a light weight)

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 very treatable. Exercise is the single best-evidenced treatment — guidelines put it ahead of injections and surgery — and it does not 'wear the joint out'. Stronger muscles protect the joint.

  • Flares are okay — and not damage

    Some pain while you exercise (up to about 5/10) is fine, and an occasional flare that settles back to baseline within a day is expected — it is NOT a sign of harm. If pain goes beyond that, reduce the load a little; don't stop moving.

  • If you carry extra weight, losing a little helps a lot

    For people who are overweight, losing weight reliably reduces knee pain and improves function — any amount helps, and around 10% is better than 5%. It's worth pairing with the exercise.

Common questions

Will exercise wear the joint out faster?
No — the opposite. Strengthening offloads and protects the joint; 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.
Do I need an X-ray?
Usually not — knee OA is diagnosed clinically from your age and symptoms; imaging doesn't change the first-line plan.

Go deeper

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