Knee Arthritis: Causes, Symptoms, and Modern Treatment Options

If climbing stairs, getting up from a chair, or walking after sitting for a while now hurts in a way it never used to, you may be one of millions of Indians living with knee arthritis. It is the single most common reason adults over forty come to an orthopedic clinic — and one of the most misunderstood. The good news is that modern care has changed enormously: most patients can be managed without surgery, and when surgery is needed, the techniques are far gentler than the operations your parents’ generation knew. This guide explains what knee arthritis actually is, how it progresses, the warning signs, and every treatment option you should know about before deciding what to do next.

What is knee arthritis?

The healthy knee is a remarkably engineered hinge. Two long bones — the thigh bone (femur) and the shin bone (tibia) — meet end-to-end and are capped by smooth, slippery cartilage. A small disc-shaped bone called the patella (kneecap) glides on the front, and two C-shaped shock absorbers (the medial and lateral menisci) sit between the femur and tibia. Strong ligaments and the muscles of the thigh hold everything in line. Arthritis simply means inflammation of a joint, but in the knee it nearly always refers to wear-and-tear damage to that cartilage — a condition called osteoarthritis. As the cartilage thins, the bones that used to glide on a friction-free surface begin to grind, the joint becomes inflamed, the supporting muscles weaken from disuse, and a vicious cycle of pain, stiffness and lost function sets in.

Less commonly, knee arthritis can be driven by an autoimmune process (rheumatoid arthritis), gout, or as a sequel to an old injury such as an untreated meniscus tear or fracture (post-traumatic arthritis). The treatment principles are similar, but the medical workup is different, which is why a careful history and examination matter so much at the first visit.

What causes it?

Knee arthritis is multi-factorial. The biggest contributors we see in clinic are:

• Age and family history. Cartilage naturally becomes less resilient with time, and there is a clear genetic component.
• Body weight. Every extra kilogram of body weight translates to roughly four extra kilograms of load through the knee with each step. Even modest weight loss can dramatically reduce pain.
• Previous injury. An ACL tear, a meniscus injury that was never treated, a fracture that healed slightly out of line — any of these can accelerate cartilage wear by ten or twenty years.
• Repetitive high-impact load. Decades of squatting on hard floors, jumping sports, or jobs that involve heavy lifting in deep flexion add up.
• Mal-alignment. Bow-legged or knock-kneed limbs concentrate load on one half of the joint, wearing that compartment out first.

Symptoms and warning signs

Most patients describe a slow march of symptoms rather than a sudden problem. The classic story is a dull ache after a long walk that improves with rest, then progresses to morning stiffness lasting fifteen to thirty minutes, swelling after activity, and grinding or crackling noises when bending the knee. Many patients describe pain on the inner side of the knee specifically — this is because the medial compartment usually wears first in Indian patients, who tend to be slightly bow-legged. As the disease advances, the knee may catch or give way, and squatting or sitting cross-legged becomes impossible. Sharp night pain that wakes you from sleep is a sign that the joint has become significantly inflamed and merits prompt attention.

How knee arthritis is diagnosed

Diagnosis is mostly clinical: a careful conversation about your symptoms, a hands-on examination of how the knee moves, where it’s tender, and how the kneecap tracks. A standing X-ray is the single most useful test — it shows joint-space narrowing, bone spurs (osteophytes), and any deformity, and it costs very little. An MRI is generally not needed to diagnose arthritis; it is reserved for cases where we suspect a coexisting meniscus tear, ligament injury, or unusual bone problem. Blood tests are ordered selectively when an inflammatory arthritis is on the cards.

Treatment: a stepped approach

Treatment should match the severity. Almost no one needs surgery as a first step. The principle is to do the least invasive thing that gets you back to the life you want.

1. Conservative care (Grade 1–2 arthritis)

Structured physiotherapy aimed at strengthening the quadriceps and the hip stabilisers is the foundation of treatment — and the step most often skipped. A focused twelve-week programme can reduce pain scores by half. Layered on top of physio: weight optimisation, simple analgesics or anti-inflammatories used in short, supervised courses, knee-friendly activity modification (swimming, cycling, elliptical training rather than running on tarmac), and topical NSAID gels.

2. Injections (Grade 2–3 arthritis)

When pain is limiting function despite the above, intra-articular injections can buy meaningful relief. Options include corticosteroid (fast, short relief useful before a holiday or family event), hyaluronic acid (longer relief, often 4–6 months), and platelet-rich plasma (PRP) — an autologous concentrate that has good evidence in mild to moderate arthritis.

3. Arthroscopic surgery (selected cases)

Keyhole surgery to clean up a torn meniscus or loose cartilage has a limited but real role — typically when there is a clear mechanical trigger such as locking or catching superimposed on arthritis. It is not a treatment for arthritis itself.

4. Partial knee replacement (Grade 3 arthritis isolated to one compartment)

If wear is limited to one half of the joint, a partial (uni-compartmental) replacement is a bone-conserving option with a faster recovery, more natural-feeling knee, and excellent long-term results in carefully selected patients.

5. Total knee replacement (Grade 4 arthritis)

When the joint is widely worn and conservative care has run its course, a total knee replacement is the single most reliable orthopedic operation we perform. Modern implants and techniques mean most patients are walking with a frame within hours of surgery, off all walking aids by six weeks, and back to normal day-to-day life by three months. Implants regularly last twenty to twenty-five years.

Living well with knee arthritis

Whatever stage you are at, three habits make the single biggest difference: keep moving (a strong quadriceps muscle is the best painkiller you will ever have), keep weight in check, and avoid the activities that flare you up while finding lower-impact alternatives. Indian patients in particular benefit from switching from floor sitting to chair sitting, raising the western-style toilet seat, and putting a small step beside the bed.