Knee Osteoarthritis Exercise Guide
Kellgren-Lawrence Grade-Wise Rehabilitation Protocol (Dos and Don'ts)
Clinical Objective
Knee osteoarthritis management must be customized to the structural degeneration stage (Kellgren-Lawrence Grades 1 to 4). Low-impact strengthening, joint lubrication, and activity modification help preserve remaining cartilage, reduce pain, and improve functional stability.
Grade-Wise Protocol
Grades 1 & 2 — Mild Degeneration / Early Intermittent Stiffness
Stationary Cycling (Low Resistance)
WatchHow: Cycle on a stationary bike at low resistance for 10–15 minutes with the seat adjusted so the knee has a slight bend at full extension.
Purpose: Promotes synovial fluid circulation and joint nutrition without high-impact compression.
Demo curated by E3Rehab
Straight Leg Raises & Clamshells
WatchHow: Perform standard straight leg raises and side-lying clamshells to build quadriceps and gluteal baseline strength.
Purpose: Stabilizes the lower limb alignment early to prevent asymmetrical joint wear.
Demo curated by AskDoctorJo
Grade 3 — Moderate Degeneration / Frequent Pain & Stiffness
Terminal Knee Extensions (TKEs) with Band
WatchHow: Loop a band behind the knee, step back to create tension, and fully lock out the knee against light resistance.
Purpose: Strengthens the VMO quad muscle to support tracking without deep joint flexion under load.
Demo curated by BobandBrad
Seated Long-Arc Quads
WatchHow: Sit upright in a chair and slowly straighten your leg out in front of you, holding for 3–5 seconds before lowering.
Purpose: Controlled open-chain strengthening tailored to moderate tolerance limits.
Demo curated by E3Rehab
Grade 4 — Severe Degeneration / Bone-on-Bone / Chronic Pain
Supine Heel Slides & Gentle Passive ROM
WatchHow: Lying down, gently slide your heel toward and away from your buttocks using a towel or strap assist to remain unloaded.
Purpose: Preserves basic range of motion without bearing bodyweight compressive loads.
Demo curated by Physiotutors
Isometric Quad Sets (Bed/Chair)
WatchHow: Sit or lie with legs straight, place a small towel under the knee, and push downward, tightening the thigh muscle for 5 seconds.
Purpose: Maintains muscle activation safely without joint movement in advanced degenerative stages.
Demo curated by Physiotutors
Movements & Habits to Avoid
Deep Squats and Deep Knee Bending (> 90 Degrees)
Risk: Dramatically increases patellofemoral and tibiofemoral compressive stress, worsening cartilage breakdown.
High-Impact Running, Jumping, or Pounding Activities
Risk: Exposes degenerate articular surfaces to sharp shock waves and accelerated wear.
Heavy Resisted Open-Chain Knee Extension Machines
Risk: Places massive shear stress across the joint line during terminal extension under heavy loads.
Clinical GuidelineExercise discomfort should never exceed a mild, tolerable ache (2–3/10). Stop immediately if sharp joint grinding or acute swelling occurs.
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