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Knee osteoarthritis

The commonest reason a knee hurts after 50, and the reason most injections are given. Knowing which grade you are at changes which treatments are realistic, so it is worth understanding what the X-ray report actually says.

Audience
Written for patients and carers in Malaysia
Last reviewed
20 September 2026

What is going wrong in the joint

Cartilage is the smooth layer that caps the ends of the thigh bone and shin bone. It has no nerves and no blood supply, and it is kept alive by movement pushing fluid in and out of it.

In osteoarthritis that surface softens, roughens and thins. The bone underneath reacts by hardening and growing spurs at the edges, called osteophytes. The synovium, the lining of the joint, becomes intermittently inflamed. The joint fluid loses hyaluronic acid and with it the thickness that cushioned the load.

The pain does not come from the cartilage, which cannot feel anything. It comes from the bone, the lining and the capsule around the joint.

Symptoms that point to osteoarthritis

  • Pain that is worse with use and better with rest, at least at first.
  • Stiffness lasting under 30 minutes in the morning. Stiffness lasting much longer suggests an inflammatory arthritis instead.
  • Difficulty on stairs, particularly going down.
  • Grating, clicking or a catching sensation.
  • Swelling that comes and goes, often after a long day.
  • The knee giving way, usually because the thigh muscle has weakened.

How the grades are read

Nearly every Malaysian clinic grades an X-ray on the Kellgren-Lawrence scale. When the report says grade 2 or grade 3, this is what it means.

GradeWhat the X-ray showsWhat it usually feels likeWhat tends to help
0NormalNo osteoarthritis painNothing required
1Doubtful narrowing, possible small spurOccasional ache after heavy useWeight, quadriceps strengthening, activity change
2, mildDefinite small spurs, joint space still preservedPain on stairs and after long walks, morning stiffnessExercise programme plus injection if pain persists
3, moderateMultiple spurs, definite narrowing, bone hardeningDaily pain, limited walking distance, episodes of swellingInjection, structured physiotherapy, walking aid in flares
4, severeLarge spurs, marked narrowing, deformity of bone contourPain at rest and at night, visible bowing, difficulty standing upSurgical assessment, injection for symptom control meanwhile

What actually changes the course of it

Three things have the strongest evidence, and none of them is an injection.

Weight

Each kilogram lost takes roughly three to four kilograms of load off the knee with every step. A loss of five per cent of body weight produces a measurable fall in pain scores in trials. For a 90 kg person that is four and a half kilograms, which is achievable.

Quadriceps strength

The muscle at the front of the thigh absorbs load before it reaches the joint. It weakens quickly when a knee hurts, which makes the knee hurt more. Straight leg raises, sit-to-stand repetitions and static quadriceps holds are unglamorous and they work.

Continued movement

Cartilage needs load cycling to stay nourished. Cycling, swimming, brisk walking on level ground and stationary bikes all qualify. The aim is regular moderate loading, not rest.

Where injections come in

An injection is a second-line treatment. It is for the person who is doing the weight and exercise work but still has pain that limits them, or the person whose pain is so bad that they cannot start the exercise work at all. Used that way it buys the window in which everything else becomes possible.

Grade matters here. At grade 2 and 3 an injection typically gives good relief. At grade 4, with no joint space remaining, relief is usually shorter and the conversation should include a surgical opinion.

Osteoarthritis in Malaysia

Knee osteoarthritis is more common here than global averages, and it appears earlier. Prayer positions, squat toilets, high rates of obesity and diabetes, and a hot climate that discourages outdoor walking all contribute. If floor sitting or deep squatting is part of your daily routine, tell your doctor: a change in how you perform those positions often matters more than any tablet.

Questions about knee osteoarthritis

What are the first signs of knee osteoarthritis?
Stiffness for the first few minutes after sitting or on waking, aching after a long walk or standing, discomfort going down stairs more than up, and an occasional grating or clicking feeling. Pain that wakes you at night or swelling that comes on suddenly suggests something more inflammatory and should be checked.
What is grade 3 knee osteoarthritis?
On the Kellgren-Lawrence scale, grade 3 means definite narrowing of the joint space, multiple osteophytes, some hardening of the bone beneath the cartilage and possible deformity of the bone contour. It is moderate to severe. Injections still help at this stage but the effect is usually smaller and shorter than at grade 2.
Can knee osteoarthritis be cured?
No treatment available today reverses it. What can be changed is how much it hurts and how much it limits you, and the rate at which it progresses. Weight, muscle strength around the knee and staying active are the three levers with the strongest evidence behind them.
Is walking good or bad for knee osteoarthritis?
Good, in almost all cases. Cartilage has no blood supply and depends on movement to exchange nutrients. Rest makes stiffness and muscle weakness worse. What is unhelpful is high-impact loading on an inflamed knee: swap running for cycling or swimming during a flare, and return gradually.
When should I see a doctor about knee pain?
If pain has lasted more than six weeks, if the knee locks or gives way, if it is hot and swollen, if you cannot put weight on it, or if painkillers are becoming a daily habit. Earlier assessment gives more options, because the treatments that work best work best early.
Why is knee osteoarthritis so common in Malaysia?
Rates here run above global averages and appear earlier. Contributing factors include high prevalence of obesity and diabetes, daily deep squatting and floor sitting, prayer positions that load the joint, and a hot climate that discourages outdoor walking. Changing how you perform floor positions often matters more than any tablet.
Does losing weight really help knee pain?
Yes, and the effect is larger than most people expect. Each kilogram lost removes roughly three to four kilograms of load from the knee at every step. A five per cent reduction in body weight produces a measurable fall in pain scores in trials, which for a 90 kg person is four and a half kilograms.

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