Exercise Recommendations for Knee Osteoarthritis

Core Exercise Components

The American Academy of Orthopaedic Surgeons recommends low-impact aerobic exercises, such as walking, cycling, and swimming, to reduce pain and improve function in patients with knee osteoarthritis 1, 2
Aerobic exercise has demonstrated statistically significant effects on pain relief (effect size 0.52) and disability reduction (effect size 0.46) in patients with knee osteoarthritis 2, 3
The American College of Rheumatology suggests aiming for 30-60 minutes of moderate-intensity aerobic activity most days of the week for patients with knee osteoarthritis 4, 5
Aquatic exercises performed in warm water provide additional pain relief through buoyancy that reduces joint loading in patients with knee osteoarthritis 6
Quadriceps strengthening exercises are specifically recommended for knee osteoarthritis and show significant improvements in pain and function, according to the American Academy of Orthopaedic Surgeons 2, 7
Range-of-motion exercises are conditionally recommended to address joint stiffness and limited motion in patients with knee osteoarthritis, with a focus on gentle stretching of muscles around the knee joint 4, 2, 3

Supervised exercise programs are more effective than self-directed programs for patients with knee osteoarthritis, resulting in greater pain reduction and functional improvement 7
Individually delivered programs tend to result in greater pain reduction and functional improvement compared to class-based or home-based programs, although the evidence is not strong 8
Aim for at least 12 supervised sessions for optimal results in patients with knee osteoarthritis 8
Exercise should be performed at least 3 times per week for maximum benefit, with a gradual increase in intensity over several months 4, 6, 8

Weight loss is strongly recommended for patients with knee osteoarthritis who are overweight, with a minimum 5% reduction in body weight significantly improving function 4, 3
Combine dietary modification with exercise for optimal results in weight loss and improved function in patients with knee osteoarthritis 3
Participation in self-management education programs is conditionally recommended for patients with knee osteoarthritis, helping with goal-setting, problem-solving, and coping strategies 4, 9

Pain during exercise should not prevent participation, as clinical trials demonstrate improvements even in patients with pain, according to the American College of Rheumatology 7
High-impact exercises should be avoided as they may increase joint damage in patients with knee osteoarthritis 6
Exercise programs should be modified if they exacerbate pain significantly, with a focus on low-impact aerobic exercise and gentle strengthening 4, 6
Balance exercises may be included as a complementary component, especially for older adults with knee osteoarthritis 7

Walking is the most studied and readily accessible aerobic activity for adults with knee osteoarthritis, suitable on a treadmill or in community‑based programs. 10
Cycling on a stationary bicycle is advised to minimise joint impact while providing cardiovascular benefit. 11
Swimming and other warm‑water aquatic exercises add analgesic effects from water temperature and reduce joint loading through buoyancy. 11

Targeted quadriceps strengthening (including supine quad sets, seated short‑arc and long‑arc quad sets, and closed‑chain knee extensions) produces clinically significant reductions in knee pain and improvements in functional ability. 12
The recommended dosing is 5–7 repetitions performed 3–5 times per day (e.g., before rising, before stair use, and before bedtime). 12

Adding balance training is conditionally recommended for older adults with knee osteoarthritis, although the supporting evidence is of low quality. 10
Integrating self‑efficacy education with exercise programs and concurrent weight‑loss interventions enhances overall treatment effectiveness. 10

Experiencing pain while exercising should not automatically stop participation; clinical trials have demonstrated functional gains even when pain is present, as endorsed by the American College of Rheumatology. 10
No universally accepted pain threshold exists for discontinuing exercise; decisions should be made jointly by clinician and patient. 10

Achieving a minimum of 5 % body‑weight loss is strongly recommended for overweight or obese individuals with knee osteoarthritis, with incremental benefits observed up to >20 % weight loss. This recommendation is supported by the American College of Rheumatology. 10