If you've been told your hip or knee is "wear and tear," it's natural to worry that using it will wear it out faster. It's one of the most common things I hear — and it's the opposite of what actually happens. Here's the real story, and what we'll do about it together.
Your joint is alive, not a machine
A car part wears down a little every time you use it and never grows back. Your joint is nothing like that. It's living tissue that responds to how you treat it — it gets stronger when you use it well, and weaker when you protect it and sit still.
A way to picture it: the smooth cushion inside your joint has no blood supply of its own. It's fed by joint fluid that only moves when you move — like a sponge that soaks up water when you squeeze and release it. Movement is how the cushion stays nourished.
The cushion in your joint is porous, like a sponge. Left alone it dries out, thins, and stiffens — the fluid just sits around it. Moving squeezes and releases it, driving fluid deep inside so it stays thick and springy. Motion really is lotion for the joint.
What's really going on
“It's bone-on-bone.”
What a scan shows often doesn't match how a joint feels or works — plenty of people with the same picture have no pain at all. The image doesn't decide what you can do.
“Moving wears it out.”
Resting is what weakens the joint. Gentle, regular movement keeps the cushion nourished and the muscles around it strong — which is exactly what protects it.
“If it aches, I'm harming it.”
Some ache while you build up is the joint waking up, not wearing down. There's a simple rule for how much is okay — see below.
“I'll just need surgery.”
Many people improve enough with exercise that surgery waits or isn't needed. And if you do have surgery, a stronger joint going in means a better recovery coming out.
How much soreness is okay?
This is the question everyone has, so let's make it simple. A little soreness as you get stronger is fine and expected. Use this as your guide:
The rule of thumb: soreness should settle within a day, and shouldn't climb week to week. If it does, we just dial the amount back — we don't stop.
How we build you up
Start where you are
We begin at a level your joint is comfortable with today — even small, gentle movements count. There's no need to earn it first.
Move most days
A little and often beats a lot now and then. Walking, cycling, or your exercises on most days keeps the joint fed and the muscles working.
Get stronger, slowly
The muscles around the joint are its shock absorbers. We build them up step by step, adding a little as you tolerate it — using the soreness rule as our guide.
Keep it going
The gains last as long as you keep moving. The goal isn't a finish line — it's a habit you can carry on your own, for good.
This isn't second best — it's the treatment
Exercise and staying active are the first thing recommended for hip and knee osteoarthritis in every major medical guideline — including the American College of Rheumatology and international OARSI guidelines — ahead of injections and surgery. It eases pain and improves how well you move, without the risks that come with other options. You're not settling; you're doing the thing that works best.
What helps most
Keep moving daily. Walking, cycling, swimming — whatever you enjoy enough to keep doing. The best exercise is the one you'll actually stick with.
Build strength a few times a week. Strong muscles around the hip and knee take load off the joint and are the biggest difference-maker.
Use the soreness rule. A little ache is fine if it settles by the next day. That's your green light to keep going.
Carrying less weight helps, if that's you. For the knee especially, even a modest amount eases the load on the joint with every step — and pairs best with exercise, not instead of it.
Be patient. Joints respond over weeks, not days. Steady wins this one.
If you have a flare
Don't panic — a flare isn't damage. Sore, grumpy spells are normal and expected. They pass.
Ease the load, don't stop. Cut your activity back by about half for a few days rather than resting completely.
Keep gently moving. Short, easy movement keeps the joint nourished and settles things faster than staying still.
Build back up. As it calms, step back toward your usual amount. We planned for flares — one doesn't undo your progress.
When to stop and reach out
Most aches and stiff spells are part of the normal arthritis picture. A few signs are different and need a closer look — stop and contact your physical therapist or doctor if you notice:
A hot, red, swollen joint, especially with a fever or feeling generally unwell. This needs prompt attention.
The joint truly locking or giving way — buckling so you can't trust it, or getting stuck so you can't straighten or bend it.
Severe pain that wakes you at night and won't settle no matter how you position yourself.
A recent fall or injury that changed the pain — especially if you have osteoporosis or take long-term steroid medication.
Unexplained weight loss, fevers, or night sweats along with the joint pain.
When in doubt, ask. I'd always rather hear from you than not.
Your joint was built to move. Moving it gently and often is how you keep it — and you — going strong.
Selected references
Kolasinski SL, et al. 2019 American College of Rheumatology/Arthritis Foundation guideline for the management of osteoarthritis of the hand, hip, and knee. Arthritis Rheumatol. 2020. PMID 31908163.
Bannuru RR, et al. OARSI guidelines for the non-surgical management of knee, hip, and polyarticular osteoarthritis. Osteoarthritis Cartilage. 2019. PMID 31278997.
Fransen M, et al. Exercise for osteoarthritis of the knee. Cochrane Database Syst Rev. 2015. PMID 25569281.
Messier SP, et al. Effects of intensive diet and exercise on knee joint loads, inflammation, and clinical outcomes among overweight and obese adults with knee osteoarthritis (IDEA). JAMA. 2013. PMID 24065013.