Knee Osteoarthritis:
12 Expert Questions Answered

Knee osteoarthritis involves the progressive breakdown of articular cartilage — the smooth tissue cushioning the ends of the femur, tibia, and patella. The term "wear and tear" implies the joint wears out from use, but this is misleading. Joints actually need regular movement and loading to remain healthy. Cartilage has no direct blood supply — it receives nutrition only through the compression and release that occurs during movement. A knee that stops moving is deprived of this nutrition and deteriorates faster. Modern understanding treats knee OA as a complex metabolic and biomechanical condition, not simply a consequence of ageing or activity.

No — and this is one of the most important points in knee OA management. Research consistently shows that imaging severity correlates poorly with pain and function. Many patients with severe bone-on-bone X-ray changes have minimal daily pain. Equally, some patients with mild radiological findings are significantly limited. Physiotherapy treatment at PhysioNutra Clinic is guided by what you experience — your pain pattern, functional limitations, walking capacity, and strength — not by what a scan shows. A severe X-ray is not a surgical referral. It is a prompt to begin supervised physiotherapy.

This is called start-up pain or gelling — a hallmark of knee OA. When you are stationary, the synovial fluid that lubricates the joint becomes less evenly distributed, and the supporting muscles cool and stiffen. When you begin moving, pain peaks before settling as the joint warms up, fluid redistributes, and muscles activate. Morning stiffness lasting under 30 minutes is typical of OA. If stiffness persists beyond 30 minutes, this suggests inflammatory arthritis (such as rheumatoid arthritis) and warrants further investigation. The practical implication: a few minutes of gentle movement before demanding activity — not prolonged rest — is the correct response to start-up pain.

This is the single most common and most important misconception about knee OA. Appropriate exercise does not damage arthritic cartilage. Some initial soreness when starting a programme is entirely normal and expected — it is muscle adaptation, not joint damage. Your physiotherapist will keep exercise within a safe range using this guideline: pain during exercise should not exceed 5/10, and any increased soreness should fully resolve within 24 hours. If it does, you exercised at the right intensity. Patients who exercise consistently have less pain, better function, stronger muscles, and slower disease progression than those who rest and avoid activity.

In early to moderate knee OA, the following should be avoided or carefully modified:

• Running on hard surfaces (treadmill on incline or trail running is preferable if running is maintained)
• Deep squats beyond 90° knee flexion until adequate quad strength is established
• Heavy leg presses through full range in early rehab
• High-impact jumping and plyometrics
• Prolonged kneeling or squatting positions

What you should do instead: stationary cycling, swimming, walking on even surfaces, progressive quad and hip strengthening, and balance training. Your physiotherapist will modify exercises to your specific stage — what is avoided at Grade 2 may be appropriate at Grade 4 with correct technique.

Swimming is excellent for knee OA — buoyancy reduces joint load while water resistance provides meaningful strengthening stimulus, particularly for the quadriceps and hip muscles. It is ideal during flare periods or for patients who cannot tolerate weight-bearing exercise initially. However, swimming alone is not sufficient as the only exercise for knee OA. Land-based weight-bearing exercise is essential because: cartilage requires mechanical loading under gravity to receive proper nutrition; functional strength for daily activities (standing, stairs, walking) requires weight-bearing training; and bone health depends on impact loading. The ideal programme combines both — water exercise for low-impact cardiovascular conditioning and land-based strengthening for functional capacity.

Self-management through home exercise is a valuable component of knee OA care, but supervised physiotherapy consistently produces significantly better outcomes than unsupervised home exercise alone. The reasons are clinical: a physiotherapist performs a thorough biomechanical assessment to identify your specific contributing factors (quad weakness, hip weakness, gait deviation, patellar malalignment); prescribes correctly dosed, progressively loaded exercises tailored to your stage; corrects technique to ensure exercises are effective and safe; provides manual therapy where appropriate; and monitors response to adjust the programme. For patients with mild OA and good body awareness, a home programme with periodic review works well. For moderate-severe OA, self-management without professional guidance produces incomplete results and increased risk of symptom flare from incorrect exercise intensity.

Corticosteroid (cortisone) injections can provide meaningful short-term pain relief — typically 4–8 weeks — for knee OA, particularly during acute flare-ups with significant swelling and inflammation. They are most useful as a bridge to physiotherapy: reducing pain enough to allow exercise participation rather than as a standalone treatment. Long-term safety concerns exist. Research indicates that repeated cortisone injections — more than 3–4 per year into the same joint — may accelerate cartilage loss and contribute to faster disease progression. They do not slow OA progression and do not rebuild the muscle support the joint needs. Used selectively and appropriately, they are a valid tool. Used repeatedly as the primary treatment, they are harmful.

These two injection types work through different mechanisms:

• Cortisone (corticosteroid): Reduces joint inflammation directly. Works faster — relief often within days. Duration 4–8 weeks. Best for acute, inflamed, swollen knee OA episodes.
• Hyaluronic acid (viscosupplementation / gel injections): Supplements the joint's natural synovial fluid to improve lubrication. Works more slowly — takes 2–4 weeks to peak. Duration up to 3–6 months in some patients. Best for chronic, less inflamed knee OA.

The evidence for hyaluronic acid injections is more mixed than for cortisone, with some clinical guidelines not recommending them routinely. Neither injection type replaces exercise therapy, which produces superior long-term outcomes. Both should be considered adjuncts — not alternatives — to physiotherapy.

The evidence is specific and encouraging: a weight loss of 5–10% of total body weight produces clinically significant, measurable reductions in knee pain and improvements in function for overweight patients with knee OA. The mechanism: every extra kilogram of body weight generates approximately 4 kg of compressive force through the knee joint with each step. Across a typical day of walking, this adds up to millions of kilograms of excess cumulative load. Reducing this load through weight loss is one of the most powerful non-surgical interventions available — equivalent in pain relief terms to corticosteroid injections, but sustained and without side effects. At PhysioNutra Clinic we integrate exercise-led weight management with nutritional guidance so you achieve this target in a sustainable, muscle-preserving way.

In most cases, yes — and the evidence strongly supports this. Knee replacement surgery is appropriate only after a genuine, complete course of non-surgical management has been trialled and failed. "Genuine" means 3–6 months of supervised physiotherapy with progressive strengthening, appropriate weight management, and activity modification — not 2 weeks of home exercises. Studies show that a significant proportion of patients on waiting lists for knee replacement experience sufficient improvement through structured physiotherapy to defer or avoid surgery entirely. At PhysioNutra Clinic we regularly see patients referred with surgical recommendations who achieve dramatic improvement through 10–12 weeks of targeted rehabilitation. That said, if conservative management has genuinely been completed without sufficient relief and pain is severely limiting daily life, surgery is the correct next step and physiotherapy post-operatively is essential for optimal recovery.

PhysioNutra Clinic provides expert knee osteoarthritis physiotherapy at our main clinic in Zirakpur — approximately 15 minutes from Chandigarh and 10 minutes from Mohali. We offer comprehensive assessment, individualised exercise programmes, manual therapy, gait retraining, and nutritional guidance. Home visits across the Tricity region (Chandigarh, Mohali, Panchkula, Zirakpur, Kharar) are available for patients with significant mobility limitations. Contact Dr. Tarun Garg at +91 94177 91833 to book your free first consultation — no imaging required to begin.