Exercise for Osteoarthritis: The Best (and Worst) Movements for Joint Health

Why Exercise Is the Most Important OA Treatment Most People Skip

If exercise were a pill, it would be the best-selling arthritis medication on the planet. Clinical trials consistently show that regular exercise reduces OA pain by 30-50%, improves physical function, and slows disease progression [1]. These effects match or exceed what most medications offer, without the gastrointestinal bleeding, kidney damage, or cardiovascular risks of long-term NSAID use.

Yet fewer than 10% of adults with OA meet recommended exercise guidelines [2]. The primary reason is pain avoidance. When a joint hurts, the instinct is to rest it. That instinct is wrong, and understanding why requires knowing a bit about how cartilage works.

The Biology: Why Cartilage Needs Movement

Articular cartilage has no blood supply. Unlike muscle, bone, and most other tissues, cartilage cannot receive oxygen and nutrients through blood vessels. Instead, it relies on a sponge-like mechanism: when the joint is loaded during weight-bearing or movement, synovial fluid is pushed into the cartilage matrix. When the load is removed, waste products are squeezed out [3].

This means that prolonged inactivity literally starves cartilage of the nutrients it needs to maintain itself. Conversely, regular cyclical loading (the kind you get from walking, cycling, or swimming) keeps cartilage healthy and resilient.

Research using quantitative MRI has shown that moderate exercise does not thin cartilage in OA patients and may actually improve its biochemical composition. A study from the Osteoarthritis Initiative found that participants who engaged in regular moderate physical activity had better cartilage quality on T2-weighted MRI compared to sedentary controls [4].

The Four Pillars of OA Exercise

An effective exercise program for osteoarthritis includes four complementary types of activity. Each targets a different aspect of joint health, and the combination produces the best results.

1. Strengthening Exercises

Weak muscles around an arthritic joint force the joint itself to absorb more impact and stress. Strengthening the surrounding musculature acts like a shock absorber, offloading the damaged cartilage and reducing pain with every step [5].

For knee OA, quadriceps weakness is a major risk factor for disease progression. A systematic review found that quadriceps strengthening alone reduces knee pain by an average of 25-30% [6]. Hamstring and hip abductor strengthening also help by improving how forces are distributed across the joint.

Progressive resistance is the key principle. Start with whatever load is comfortable (even bodyweight-only exercises) and gradually increase over weeks. The muscle needs to be challenged beyond its current capacity to get stronger, but the progression should be slow enough that it doesn’t provoke significant joint flares.

Examples of effective strengthening exercises:

• Straight-leg raises: Strengthen the quadriceps without bending the knee, making them tolerable even during flares
• Wall sits or partial squats: Build quadriceps and glute strength through a pain-free range of motion
• Clamshells and lateral band walks: Target the hip abductors, which are critical for knee and hip OA
• Resistance band exercises: Allow progressive loading with minimal equipment

2. Low-Impact Aerobic Exercise

Aerobic exercise reduces systemic inflammation, helps with weight management, improves cardiovascular health, and directly reduces OA pain through endorphin release and improved joint circulation. The key is choosing activities that load the joints cyclically without high impact forces [7].

The best-studied aerobic exercises for OA include:

• Walking: The simplest and most accessible option. A 2019 study found that walking at least 6,000 steps per day reduced the risk of developing functional limitation from knee OA [8]. Start with whatever distance is comfortable and increase by 10% per week.
• Cycling: Excellent for knee and hip OA because it provides smooth, cyclical joint loading with minimal impact. Stationary bikes allow control over resistance and eliminate balance concerns. Keep the seat height appropriate to avoid excessive knee flexion.
• Elliptical training: Mimics a running motion without the impact forces of foot strike. A good option for people who find walking aggravating but want a weight-bearing workout.
• Tai chi: Combines gentle aerobic movement with balance training and flexibility. A randomized trial published in the Annals of Internal Medicine found that tai chi was as effective as standard physical therapy for knee OA, with additional benefits for depression and quality of life [9].

3. Flexibility and Range-of-Motion Exercises

OA joints tend to stiffen over time as the body lays down scar tissue and osteophytes limit movement. Muscles and tendons around the joint shorten when range of motion decreases, creating a cycle where stiffness begets more stiffness.

Daily stretching helps maintain the joint’s available range and reduces the sensation of stiffness that is often worst in the morning. Hold stretches for 15-30 seconds and avoid bouncing (ballistic stretching), which can trigger muscle guarding.

Yoga has strong evidence for OA. A systematic review of 12 RCTs found that yoga significantly improved pain, stiffness, and physical function in people with knee OA [10]. The combination of sustained stretching, strengthening (holding poses), and mindful breathing appears particularly effective.

4. Aquatic Exercise

Water provides a unique exercise environment for people with OA. Buoyancy reduces the weight borne by joints by 50-90% depending on water depth, while water resistance provides a strengthening stimulus in all directions [11]. Water temperature (ideally 83-88°F / 28-31°C) also has analgesic effects, reducing muscle spasm and joint pain.

A Cochrane review found that aquatic exercise produced small but significant improvements in pain, function, and quality of life for people with knee and hip OA [12]. For patients who find land-based exercise too painful initially, aquatic exercise can serve as a bridge, building strength and confidence before transitioning to (or adding) land-based activities.

Options include water walking, aqua aerobics classes, lap swimming, and specific aquatic physical therapy programs. Many community pools and YMCAs offer arthritis-specific water exercise classes.

Exercises by Joint

Knee OA

The knee is the most common site for OA and the most studied for exercise interventions. Priorities include:

• Quadriceps strengthening (the single most important exercise intervention for knee OA)
• Hip abductor and external rotator strengthening to control knee alignment during walking
• Hamstring flexibility to reduce posterior knee tightness
• Calf strengthening for shock absorption
• Balance training to reduce fall risk, which increases with knee OA

Avoid deep squats, lunges, and leg presses through painful ranges. Modify to work within a comfortable arc of motion and progress gradually.

Hip OA

Hip OA responds well to a combination of strengthening and flexibility work. Key exercises include:

• Hip abductor strengthening (side-lying leg raises, clamshells, lateral band walks)
• Gluteus maximus strengthening (bridges, modified deadlifts)
• Hip flexor stretching, since prolonged sitting tightens hip flexors and increases anterior joint compression
• Internal and external rotation stretches to maintain rotational range
• Cycling, which maintains hip mobility while building quadriceps and gluteal strength

Hand OA

Hand exercises for OA focus on maintaining grip strength, dexterity, and range of motion. Evidence supports both strengthening and range-of-motion exercises for hand OA, with a systematic review showing significant improvements in grip strength and reduction in pain [13].

• Putty or stress ball squeezing for grip strength (start with soft resistance)
• Finger extension against a rubber band
• Individual finger bends and thumb opposition exercises
• Wrist circles and flexion/extension stretches
• Warm-water soaking before exercise can reduce stiffness and improve tolerance

What to Avoid

The list of exercises to avoid is shorter than most people expect. OA does not mean you are fragile, and overly cautious exercise selection often does more harm than good by promoting deconditioning. That said, some modifications make sense:

• High-impact activities during acute flares: Running, jumping, and plyometrics create ground reaction forces of 2-5 times body weight. During a flare (when the joint is swollen and extra painful), switch to lower-impact alternatives temporarily.
• Loaded deep flexion: Deep squats and lunges with heavy loads place extreme compressive forces on knee and hip cartilage. Modify to partial range or switch to seated alternatives.
• Repetitive high-load movements without warm-up: Cold, stiff joints are more vulnerable to injury. Always begin with 5-10 minutes of gentle movement before progressing to more challenging exercises.
• Prolonged complete rest: More than 1-2 days of complete inactivity after a flare leads to muscle weakening, cartilage deconditioning, and increased stiffness. Even during flares, gentle range-of-motion exercises should continue.

How Much Exercise Is Enough?

The current clinical guidelines from the American College of Rheumatology and the Arthritis Foundation recommend [14]:

• 150 minutes per week of moderate-intensity aerobic exercise (30 minutes, 5 days per week)
• 2-3 sessions per week of muscle-strengthening exercises targeting major muscle groups around affected joints
• Daily flexibility and range-of-motion exercises for affected joints

These are targets, not starting points. Someone who has been sedentary for years should begin with as little as 5-10 minutes of gentle activity and increase gradually. The principle of progressive overload applies: doing slightly more than last week is what produces adaptation. Trying to do too much too soon is the fastest way to provoke a flare and abandon the program.

Consistency matters more than intensity. Three 20-minute sessions per week sustained for a year will produce far better results than an ambitious daily program abandoned after two weeks.

Overcoming the Pain Barrier

Pain during exercise is the biggest obstacle for most people with OA, and managing it requires nuance. Some discomfort during exercise is normal and acceptable. Significant sharp pain or lasting soreness is a signal to modify.

A practical guideline: if pain during exercise stays at or below a 4 out of 10, and returns to baseline within 24 hours after exercise, the activity is at an appropriate level. If pain spikes above 5-6 out of 10 or is worse the next day than before exercise, reduce intensity or duration [15].

Other strategies for managing exercise-related pain:

• Exercise at the time of day when joints feel best (often mid-morning, after morning stiffness has resolved)
• Apply heat before exercise to reduce stiffness and ice after exercise if swelling occurs
• Take prescribed pain medication 30-60 minutes before exercise if needed to enable participation
• Start with aquatic exercise if land-based activities are too painful
• Work with a physical therapist initially to learn proper form and develop a personalized program

What the Long-Term Evidence Shows

The long-term data on exercise for OA is reassuring. A landmark study following knee OA patients over 4 years found that those who maintained regular exercise had significantly less pain and better physical function than sedentary controls, with no evidence of accelerated cartilage damage [16]. Multiple studies have shown that consistent exercise reduces the likelihood of needing joint replacement surgery [17].

Exercise also addresses the comorbidities that frequently accompany OA: obesity, cardiovascular disease, diabetes, depression, and reduced balance. For older adults with OA, the benefits extend far beyond the joints. Regular physical activity reduces fall risk, maintains independence, and improves overall quality of life.

Getting Started: A Practical Template

For someone with knee or hip OA who has been relatively sedentary, here is a reasonable starting template:

Week 1-2: 10 minutes of walking or cycling daily, plus 5 minutes of gentle stretching. Add 3 bodyweight exercises (straight-leg raises, bridges, clamshells) for 2 sets of 10 repetitions, 3 days per week.

Week 3-4: Increase walking or cycling to 15-20 minutes. Add a fourth and fifth strengthening exercise. Begin working toward 3 sets of 10-12 repetitions.

Week 5-8: Increase aerobic activity to 20-30 minutes. Add light resistance (bands or light weights) to strengthening exercises. Consider adding a tai chi or yoga class.

Week 9 and beyond: Progress toward the recommended 150 minutes of aerobic activity and 2-3 strength sessions per week. Adjust based on symptoms and goals.

The most effective exercise program is the one you actually do. Find activities you enjoy, recruit a partner for accountability, and remember that every session, no matter how short, is better than skipping it entirely.

References

[1] Fransen M, McConnell S, Harmer AR, et al. Exercise for osteoarthritis of the knee: a Cochrane systematic review. Br J Sports Med. 2015;49(24):1554-1557. doi:10.1136/bjsports-2015-095424. PMID: 26405113

[2] Wallis JA, Webster KE, Levinger P, Taylor NF. What proportion of people with hip and knee osteoarthritis meet physical activity guidelines? A systematic review and meta-analysis. Osteoarthritis Cartilage. 2013;21(11):1648-1659. doi:10.1016/j.joca.2013.08.003. PMID: 23948979

[3] Sophia Fox AJ, Bedi A, Rodeo SA. The basic science of articular cartilage: structure, composition, and function. Sports Health. 2009;1(6):461-468. doi:10.1177/1941738109350438. PMID: 23015907

[4] Racunica TL, Teichtahl AJ, Wang Y, et al. Effect of physical activity on articular knee joint structures in community-based adults. Arthritis Rheum. 2007;57(7):1261-1268. doi:10.1002/art.22990. PMID: 17907212

[5] Bennell KL, Hunt MA, Wrigley TV, et al. Role of muscle in the genesis and management of knee osteoarthritis. Rheum Dis Clin North Am. 2008;34(3):731-754. doi:10.1016/j.rdc.2008.05.005. PMID: 18687280

[6] Øiestad BE, Juhl CB, Eitzen I, Thorlund JB. Knee extensor muscle weakness is a risk factor for development of knee osteoarthritis. A systematic review and meta-analysis. Osteoarthritis Cartilage. 2015;23(2):171-177. doi:10.1016/j.joca.2014.10.008. PMID: 25450853

[7] Rausch Osthoff AK, Niedermann K, Braun J, et al. 2018 EULAR recommendations for physical activity in people with inflammatory arthritis and osteoarthritis. Ann Rheum Dis. 2018;77(9):1251-1260. doi:10.1136/annrheumdis-2018-213585. PMID: 29997112

[8] White DK, Tudor-Locke C, Zhang Y, et al. Daily walking and the risk of incident functional limitation in knee osteoarthritis: an observational study. Arthritis Care Res. 2014;66(9):1328-1336. doi:10.1002/acr.22362. PMID: 24923633

[9] Wang C, Schmid CH, Iversen MD, et al. Comparative effectiveness of tai chi versus physical therapy for knee osteoarthritis: a randomized trial. Ann Intern Med. 2016;165(2):77-86. doi:10.7326/M15-2143. PMID: 27183035

[10] Kan L, Zhang J, Yang Y, Wang P. The effects of yoga on pain, mobility, and quality of life in patients with knee osteoarthritis: a systematic review. Evid Based Complement Alternat Med. 2016;2016:6016532. doi:10.1155/2016/6016532. PMID: 27777597

[11] Bartels EM, Juhl CB, Christensen R, et al. Aquatic exercise for the treatment of knee and hip osteoarthritis. Cochrane Database Syst Rev. 2016;3(3):CD005523. doi:10.1002/14651858.CD005523.pub3. PMID: 27007113

[12] Bartels EM, Juhl CB, Christensen R, et al. Aquatic exercise for the treatment of knee and hip osteoarthritis. Cochrane Database Syst Rev. 2016;3(3):CD005523. doi:10.1002/14651858.CD005523.pub3. PMID: 27007113

[13] Østerås N, Kjeken I, Smedslund G, et al. Exercise for hand osteoarthritis: a Cochrane systematic review. J Rheumatol. 2017;44(12):1850-1858. doi:10.3899/jrheum.170424. PMID: 29093160

[14] Kolasinski SL, Neogi T, Hochberg MC, et al. 2019 American College of Rheumatology/Arthritis Foundation guideline for the management of osteoarthritis of the hand, hip, and knee. Arthritis Care Res. 2020;72(2):149-162. doi:10.1002/acr.24131. PMID: 31908163

[15] Quicke JG, Foster NE, Thomas MJ, Holden MA. Is long-term physical activity safe for older adults with knee pain? A systematic review. Osteoarthritis Cartilage. 2015;23(9):1445-1456. doi:10.1016/j.joca.2015.05.002. PMID: 26003947

[16] Pisters MF, Veenhof C, van Meeteren NL, et al. Long-term effectiveness of exercise therapy in patients with osteoarthritis of the hip or knee: a systematic review. Arthritis Rheum. 2007;57(7):1245-1253. doi:10.1002/art.23009. PMID: 17907210

[17] Skou ST, Roos EM, Laursen MB, et al. A randomized, controlled trial of total knee replacement. N Engl J Med. 2015;373(17):1597-1606. doi:10.1056/NEJMoa1505467. PMID: 26488691

Related Reading

• Osteoarthritis Treatment: From Joint Preservation to Regenerative Therapies
• Knee Osteoarthritis: Symptoms, Staging, and Treatment Options
• Arthritis in Hands: Types, Symptoms, and Treatments That Preserve Function