Knee Osteoarthritis: Why It Hurts and What Genuinely Helps
Knee osteoarthritis is the gradual thinning of the smooth cartilage lining the knee joint, together with changes in the bone and joint lining beneath it. It causes pain that is worse with use and better with rest, stiffness lasting under half an hour after sitting, a grating sensation, and sometimes swelling or a feeling of giving way. In adults over 45 with that pattern it is diagnosed clinically and needs no X-ray, because the picture on film matches the pain poorly. The two treatments with the strongest evidence are structured exercise, which strengthens the muscles that unload the joint, and weight reduction where weight is high, since every kilogram lost takes several kilograms of force off the knee with each step. Anti-inflammatory gel is the first medicine to try, oral anti-inflammatories are used at the lowest effective dose for the shortest time, and a steroid injection can buy weeks of relief. Glucosamine and chondroitin are not recommended. Knee replacement is reserved for pain that seriously limits life despite all of the above, and it works well when it is needed.
Health writers · Aslam Clinic
What is happening inside the joint
The ends of the thigh bone and shin bone are capped with cartilage, a slippery layer a few millimetres thick that lets them glide almost without friction. In osteoarthritis that layer thins and roughens, the bone underneath thickens and grows small spurs at the edges, and the joint lining becomes mildly inflamed and produces extra fluid. The whole joint becomes stiffer and more sensitive.
The picture most people carry is of cartilage grinding away like a brake pad, and it is worth correcting. Osteoarthritis is better understood as a joint repairing itself and losing the race — repair processes are active throughout, which is exactly why load, muscle strength and body weight change the outcome. A joint used sensibly does better than one that is protected, and that single fact is behind most of the advice below. It is not the same disease as , an immune condition attacking many joints with prolonged morning stiffness, and it is not gout, which arrives over hours in a hot, exquisitely tender joint.
Who gets it, and why it is so common here
Age is the largest single factor and cannot be changed. Several others can. Excess weight is the most powerful, both through mechanical load and because fat tissue produces signals that promote in joints — which is why weight also affects hand osteoarthritis, where load plays no part. A previous cruciate ligament or meniscal tear roughly doubles long-term risk, as does an occupation spent kneeling, squatting or carrying.
That last factor deserves a local note. Many people in Pakistan spend far more of the day in deep knee flexion than the populations these guidelines studied: sitting cross-legged on the floor, squatting for eastern-style toilets, kneeling and rising repeatedly for prayer, and squatting to work. Deep loaded flexion is associated with more knee osteoarthritis. That does not mean abandoning prayer or floor sitting. It means that if your knees already hurt, using a chair for some prayers, a raised toilet seat or a low stool for kitchen work is a reasonable adaptation rather than a defeat, and that keeping the thigh muscles strong matters more for you than for someone who sits in chairs all day.
What it feels like, and what it is not
| Pattern | Typically suggests | What is usually done |
|---|---|---|
| Pain on walking and stairs, easing with rest; stiffness under 30 minutes; crunching | Clinical diagnosis; exercise, weight, topical | |
| Morning stiffness over an hour, several joints, both hands, fatigue | Inflammatory such as | Blood tests and referral to a rheumatologist |
| Sudden severe pain over hours, red hot joint, often the big toe first | Gout or a crystal arthritis | Joint fluid examination, uric acid, anti-inflammatory treatment |
| Hot swollen knee with fever, unable to move it | Septic arthritis | Emergency. Joint aspiration and antibiotics the same day |
| Pain after a twisting injury, locking or giving way, within an hour | Meniscal or ligament tear | Examination, sometimes , orthopedic assessment |
How it is diagnosed
NICE guidance is unusually clear: in a person aged 45 or over with activity-related joint pain and either no morning stiffness or stiffness lasting under thirty minutes, osteoarthritis can be diagnosed without any test at all. Your doctor will examine the knee for swelling, range of movement, joint-line tenderness, thigh muscle wasting and ligament stability, and will check the hip, because hip arthritis often refers pain to the knee.
An is not needed to make the diagnosis and does not measure how bad your problem is. The match between what a knee looks like on film and how much it hurts is famously poor: severely worn knees that barely trouble their owner and mildly changed knees that hurt constantly are both ordinary findings. X-rays help when the diagnosis is genuinely uncertain or a surgeon is planning an operation. An is almost never required, and in an older knee it will reliably report meniscal tears that are part of the wear process rather than a separate problem to fix.
Treatment that works
| Treatment | What it does | Evidence |
|---|---|---|
| Strengthening and aerobic exercise | Strengthens the quadriceps so muscle takes load off the joint; improves function and mood | Strong. Comparable to anti-inflammatory tablets for pain, with benefits they do not have. |
| Weight loss where weight is raised | Reduces mechanical load and inflammatory signalling | Strong. Around 5 to 10 per cent of body weight produces clear improvement. |
| Topical gel | Local pain and inflammation relief with minimal absorption | Good, and the first medicine to try for a knee. Far safer than tablets. |
| Oral | Systemic pain relief | Good short-term, but stomach, kidney, blood pressure and heart risks. Lowest dose, shortest time. |
| Paracetamol | Mild pain relief | Weak for osteoarthritis. Safe, and reasonable when anti-inflammatories cannot be used. |
| injection into the joint | Settles a painful flare | Real but short-lived, typically weeks to three months. Useful to get someone moving again. |
| Walking stick, held in the opposite hand | Removes load from the affected knee | Good, and underused because people find it embarrassing. |
| Glucosamine and chondroitin | Marketed as cartilage repair | Not recommended. Benefit no better than in trials. |
| Hyaluronic acid injections | Marketed as joint lubrication | Not recommended by NICE. Small effect at best, at significant cost. |
| Arthroscopic washout or meniscal trimming for wear | Keyhole tidying of the joint | Not recommended for osteoarthritis. No benefit over sham surgery in trials. |
| Knee replacement | Replaces the worn surfaces | Very effective when pain substantially limits life despite everything else. |
Two entries there are worth saying out loud. Glucosamine and chondroitin are sold in every pharmacy here and cost a meaningful amount every month; the best trials do not separate them from a dummy tablet. And keyhole surgery to trim a degenerate meniscus in an arthritic knee has been tested against sham operations, where the surgeon made the incisions and did nothing further — the two groups did equally well. If either has been offered to you, it is reasonable to ask what evidence supports it in your case.
The exercise that actually helps
Exercise for an arthritic knee has one purpose: to make the surrounding muscles strong enough to absorb load the cartilage no longer can. It is normal for the knee to ache during and after, and for that ache to settle within a day. Pain sharply worse the next morning means you did too much, not that you caused damage. Build up over weeks and expect the first clear improvement at around six weeks of consistent work.
- Sit-to-stands. From a firm chair, stand without using your hands and sit down slowly. Start with five, build towards three sets of ten. The most functional exercise on the list.
- Straight-leg raises. Lying down, one knee bent, the other straight; lift the straight leg to the height of the bent knee, hold three seconds, lower slowly. Ten to fifteen repetitions twice a day.
- Quadriceps sets. Sitting with the leg straight, press the back of the knee down, tightening the thigh. Hold five seconds, twenty repetitions.
- Hip abduction. Lying on your side, lift the upper leg twenty to thirty centimetres and lower slowly. Weak hip muscles let the knee collapse inwards with each step.
- Walking, cycling or swimming for twenty to thirty minutes on most days. A stationary bicycle with the seat set high is particularly kind to knees.
Living with it day to day
- Footwear matters more than insoles. A cushioned, flat, well-fitting shoe with a supportive sole helps; heels and thin flat sandals worn all day do not.
- Heat for stiffness, cold for a swollen flare. Both are safe and cheap; use whichever suits you.
- Adapt the tasks that hurt. A raised toilet seat, a stool for kitchen work, a chair for prayer during a flare and a stair handrail remove more pain over a week than any tablet.
- Do not stop walking. Less walking means weaker muscles, more weight and a more painful knee — the loop that turns a manageable joint into a disabling one.
- Check your if you ache all over. Deficiency is very common in Pakistan and correcting it helps general muscle function, but it is not a treatment for osteoarthritis and should not be sold to you as one.
When to see a doctor
See a doctor if knee pain has lasted more than a few weeks, wakes you at night, swells repeatedly, gives way or locks, or if you are steadily walking less than you used to. Come sooner if the pattern does not fit ordinary osteoarthritis — several joints involved, prolonged morning stiffness, a rash, fever or weight loss — because inflammatory arthritis is treated completely differently and does much better treated early.
Referral for knee replacement is appropriate when pain and loss of function substantially affect your quality of life and non-surgical treatment has genuinely been tried. Waiting until you can barely walk is not rewarded: people who go into surgery with better muscle strength recover faster and further, which is one more reason to keep exercising even when an operation looks likely. If your back is also painful, the two often travel together — see our guide to low back pain.
Common questions
Still not sure what to do?
Reading about a symptom only goes so far. A doctor who can ask you questions and examine you will get further in ten minutes than any article can.
