Knee Strengthening for Arthritis
Talk to your doctor first. General education, not medical advice.This content is general education, not medical advice, diagnosis or treatment. Get approval from your physician or another qualified healthcare provider before starting any exercise program, especially if you have a medical condition, a recent injury or surgery, are pregnant, or take medication. Stop and seek medical advice if an exercise causes pain, dizziness, chest discomfort or shortness of breath. You choose to exercise at your own risk. Read the full medical disclaimer.
- PositionSeated in a chair
- You'll needChair
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Clinical Context
Knee osteoarthritis is one of the leading causes of disability worldwide, affecting approximately 250 million people globally. The knee joint is particularly vulnerable to degenerative changes because it bears the full weight of the body during ambulation while also accommodating the competing demands of stability and mobility.
This knee strengthening program targets the quadriceps and hamstrings — the two muscle groups most critical for knee joint protection. The quadriceps acts as a dynamic shock absorber, reducing impact forces on the articular cartilage by 30–50% during walking. The hamstrings provide posterior knee stability and work with the quadriceps to control knee flexion-extension during functional activities.
The program follows guidelines that recommend strengthening exercise as a core treatment for knee OA. A 2019 meta-analysis found that therapeutic exercise reduces knee OA pain with an effect size comparable to NSAIDs but without gastrointestinal, cardiovascular, or renal side effects. Importantly, the benefits of exercise extend beyond the musculoskeletal system — regular exercise also reduces the systemic inflammation that contributes to cartilage degradation.
Step-by-Step Instructions
- Begin seated in a sturdy chair with your back supported.
- Follow each exercise as demonstrated in the video.
- Perform each movement slowly — 3 seconds for the working phase, 3 seconds for the return.
- It is normal for arthritic knees to feel stiff initially. Mild discomfort during exercise is acceptable; sharp pain is not.
- If any exercise is too painful, skip it and continue with the next one.
Key Form Cues
- Quad squeeze (isometric): Press the back of the knee into the floor/bed. You should see the kneecap lift and the quad tighten.
- Don’t force range: Work through the range of motion that your knee allows comfortably today.
- Ice after if needed: Applying ice for 10–15 minutes after exercise can reduce post-exercise inflammation.
Progression & Regression
Regression
- Reduce repetitions per exercise
- Limit range of motion to the pain-free arc
- Perform isometric exercises only (no movement, just muscle contractions)
Progression
- Add ankle weights starting at 1 pound
- Increase hold times on isometric exercises to 10 seconds
- Progress to the Wall Squats protocol for weight-bearing strengthening
- Add resistance band exercises for hamstring curls
Precautions
Designed for arthritic knees — inherently joint-protective.
- Apply the “2-hour pain rule”: if knee pain is notably worse 2 hours after exercise, you overdid it. Reduce intensity next session.
- Avoid deep knee bending beyond 90 degrees with significant arthritis.
- During acute flares (hot, swollen knee), reduce to isometric exercises only or rest until the flare subsides.
- Post-knee replacement patients: follow your surgeon’s specific protocol for the first 12 weeks.
- Stop if: the knee locks, gives way, or develops sudden significant swelling.
Related Exercises
Try next
Fransen M, et al. Exercise for osteoarthritis of the knee: a Cochrane systematic review. Br J Sports Med. 2015;49(24):1554-1557.
NICE. Osteoarthritis: care and management. Clinical guideline CG177. National Institute for Health and Care Excellence; 2014.
Bennell KL, Hinman RS. A review of the clinical evidence for exercise in osteoarthritis of the hip and knee. J Sci Med Sport. 2011;14(1):4-9.
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