Osteoarthritis: Causes, Treatments, and Regenerative Options

Medically reviewed content. Last updated April 2026.

Osteoarthritis (OA) is the most common form of arthritis, affecting over 500 million people worldwide.^[1] If you have been told you have “wear and tear” in your joints, that diagnosis was almost certainly osteoarthritis. But calling OA simple “wear and tear” sells the condition short. It is a complex, progressive disease involving cartilage breakdown, bone remodeling, and chronic low-grade inflammation. The good news: the science of OA management has come a long way, and you have more options than ever, from regenerative therapies to targeted exercise programs, that can genuinely change the course of this disease.

This guide covers everything you need to know about osteoarthritis: the biology behind it, the treatments that work, and how regenerative and integrative approaches are changing the way we think about joint health.

What Is Osteoarthritis?

Osteoarthritis is a chronic degenerative joint disease in which the cartilage that cushions the ends of your bones gradually breaks down. But it is not just a cartilage problem. OA affects the entire joint, including the subchondral bone (the bone just beneath the cartilage), the synovial membrane (the lining of the joint), the ligaments, and the surrounding muscles.^[2]

Healthy cartilage is smooth, resilient, and slippery, allowing bones to glide against each other with minimal friction. In OA, this cartilage becomes thin, rough, and fragmented. As it wears away, the underlying bone is exposed and begins to remodel, often forming bony spurs (osteophytes) at the joint margins. The joint space narrows, the synovium becomes inflamed, and the result is pain, stiffness, and progressive loss of function.

Unlike rheumatoid arthritis, which is an autoimmune disease, OA is primarily a mechanical and biological process, though inflammation plays a more significant role than was previously recognized.

The Pathology of OA: What Is Happening Inside Your Joint

Understanding the biology of OA helps explain why certain treatments work and why the old model of “cartilage just wears out” is incomplete.

Cartilage Degradation

Cartilage is maintained by specialized cells called chondrocytes. In OA, the balance between cartilage production and breakdown is disrupted. Enzymes called matrix metalloproteinases (MMPs) and aggrecanases break down the structural proteins (collagen and proteoglycans) that give cartilage its strength and elasticity. Chondrocytes become dysfunctional and eventually die off, and the body cannot regenerate cartilage quickly enough to keep pace with the damage.^[3]

Subchondral Bone Changes

The bone beneath the cartilage undergoes significant remodeling in OA. It becomes thicker and denser (sclerotic) in some areas, while developing cyst-like lesions in others. These bone marrow lesions are strongly correlated with pain and disease progression. The subchondral bone changes may actually precede cartilage loss in some cases, suggesting the disease begins deeper in the joint than we once thought.^[4]

Osteophyte Formation

Osteophytes, or bone spurs, are bony projections that develop at the margins of osteoarthritic joints. They are your body’s attempt to stabilize the damaged joint by increasing the surface area for load bearing. While they are a hallmark of OA on X-ray, osteophytes themselves may or may not cause symptoms.

Synovial Inflammation

The synovium, the membrane that lines the joint capsule and produces synovial fluid, becomes inflamed in many OA patients. This synovitis produces inflammatory cytokines (IL-1, IL-6, TNF-alpha) that accelerate cartilage breakdown and contribute to pain and swelling. This is why OA is now considered an inflammatory condition, not merely a mechanical one.^[5]

Which Joints Are Affected?

Knees

Knee OA is the most common and most disabling form. It can affect the medial (inner), lateral (outer), or patellofemoral (kneecap) compartments, or any combination of the three. Symptoms include pain with weight-bearing activities, stiffness after sitting, crepitus (grinding or popping), and progressive difficulty with stairs, squatting, and walking.

Hips

Hip OA causes pain in the groin, thigh, or buttock area. It often leads to a reduced range of motion, particularly internal rotation and flexion. Many people with hip OA notice difficulty putting on shoes and socks or getting in and out of cars. Hip OA is the primary reason for hip replacement surgery.^[6]

Hands

OA commonly affects the distal interphalangeal joints (the joints closest to your fingertips), the proximal interphalangeal joints (the middle finger joints), and the base of the thumb (first carpometacarpal joint). Hand OA causes nodules (Heberden’s and Bouchard’s nodes), stiffness, and difficulty with grip strength and fine motor tasks.

Spine

Spinal OA (spondylosis) affects the facet joints of the cervical (neck) and lumbar (lower back) spine. It can cause localized pain and stiffness, and in some cases, osteophytes can narrow the spinal canal (spinal stenosis) or compress nerve roots, causing radiating pain, numbness, or weakness in the arms or legs.

Risk Factors

Age

OA prevalence increases significantly with age. By age 65, over half of adults have radiographic evidence of OA in at least one joint. Aging cartilage becomes less resilient and more vulnerable to damage, and the body’s regenerative capacity declines.^[7]

Obesity

Excess body weight is the single most modifiable risk factor for knee OA. Every additional pound of body weight adds roughly 4 pounds of force across the knee joint during walking. But the relationship is not purely mechanical. Adipose tissue produces inflammatory cytokines (adipokines) that promote cartilage degradation, which may explain why obesity also increases the risk of hand OA, a non-weight-bearing joint.^[8]

Prior Joint Injury

A history of significant joint injury (ACL tear, meniscus tear, fracture involving the joint surface) dramatically increases OA risk. Post-traumatic OA accounts for roughly 12% of all OA cases. An ACL tear, for example, increases the lifetime risk of knee OA by 4 to 6 times, even with surgical reconstruction.^[9]

Genetics

Genetic factors account for 40% to 65% of OA risk, depending on the joint involved. Multiple genes influencing cartilage structure, bone remodeling, and inflammatory pathways have been implicated. If your parents or siblings have OA, your risk is elevated.

Occupation and Repetitive Loading

Jobs involving repetitive kneeling, squatting, heavy lifting, or prolonged standing increase the risk of knee and hip OA. Occupational factors are particularly significant in men.

Symptoms and Stages

OA develops gradually, and symptoms typically worsen over years to decades.

Early stage: Mild, intermittent pain with activity. Stiffness after periods of inactivity (“gelling”), usually lasting less than 30 minutes. X-rays may show minimal joint space narrowing or early osteophytes.

Moderate stage: More frequent pain, including during routine activities like walking or climbing stairs. Noticeable stiffness and occasional swelling. X-rays show clear joint space narrowing, osteophytes, and possible subchondral sclerosis. This is the stage when most people seek medical attention.

Severe stage: Persistent pain, including at rest or at night. Significant stiffness and reduced range of motion. Joint deformity may be visible (e.g., bowlegged alignment in knee OA). X-rays show advanced cartilage loss, large osteophytes, and bone-on-bone contact. At this stage, joint replacement is often considered.^[10]

It is important to note that radiographic severity does not always match symptom severity. Some people with advanced OA on X-ray have surprisingly little pain, while others with early changes are significantly disabled. Pain in OA is influenced by many factors beyond the structural damage, including central sensitization, inflammation, muscle weakness, and psychological state.

Diagnosis

Physical Examination

A thorough clinical exam is the foundation of OA diagnosis. Your doctor will assess joint tenderness, range of motion, crepitus, swelling, and alignment. Specific provocative tests can help identify which structures are involved.

X-Ray

Standing (weight-bearing) X-rays are the standard imaging study for OA. They reveal joint space narrowing, osteophytes, subchondral sclerosis, and cyst formation. Weight-bearing images are essential because non-weight-bearing X-rays can underestimate the degree of cartilage loss.

MRI

MRI provides detailed visualization of soft tissues, including cartilage, menisci, ligaments, and the synovium. It is more sensitive than X-ray for detecting early OA, bone marrow lesions, and synovitis. MRI is not routinely needed for OA diagnosis but is valuable when the diagnosis is uncertain or when surgical planning is required.^[11]

Lab Tests

There is no blood test for OA. However, blood work (including inflammatory markers like ESR and CRP, rheumatoid factor, and anti-CCP antibodies) may be ordered to rule out other conditions like rheumatoid arthritis or gout. Joint fluid analysis (arthrocentesis) can help differentiate OA from crystalline or infectious arthritis.

Conventional Treatments

Medications

NSAIDs (ibuprofen, naproxen, celecoxib): Non-steroidal anti-inflammatory drugs are the most widely used medications for OA pain. They reduce pain and inflammation but carry risks with long-term use, including gastrointestinal bleeding, kidney damage, and cardiovascular events. Topical NSAIDs (like diclofenac gel) offer local relief with fewer systemic side effects and are recommended as first-line therapy for knee and hand OA.^[12]

Acetaminophen (Tylenol): Once considered first-line, acetaminophen has fallen out of favor for OA. Recent evidence shows it provides only minimal pain relief, barely better than placebo, while carrying risks of liver toxicity at higher doses. Most current guidelines now recommend NSAIDs over acetaminophen for OA.

Duloxetine: This SNRI antidepressant is FDA-approved for chronic musculoskeletal pain, including OA. It works by modulating pain processing in the central nervous system and is an option for patients who cannot take NSAIDs or who have a significant central sensitization component to their pain.

Physical Therapy

Physical therapy is one of the most effective and underused treatments for OA. A skilled physical therapist can design a program to strengthen the muscles that support your joints, improve range of motion, correct movement patterns, and reduce pain. Quadriceps strengthening, for example, is strongly associated with reduced knee OA pain and improved function. Current guidelines recommend exercise therapy as a first-line treatment for all OA patients.^[13]

Cortisone Injections

Intra-articular corticosteroid injections provide short-term pain relief (typically 4 to 8 weeks) by reducing synovial inflammation. They are useful for acute flare-ups or for patients who need temporary relief for an important event or to participate in physical therapy. However, repeated cortisone injections have been associated with accelerated cartilage loss, and most guidelines recommend limiting injections to 3 to 4 per year per joint.^[14]

Joint Replacement Surgery

Total joint replacement (arthroplasty) is the definitive treatment for end-stage OA when conservative measures have failed. Knee and hip replacements are among the most successful surgeries in all of medicine, with over 90% of patients experiencing significant pain relief and improved function. Modern implants last 20 to 25 years or more. However, surgery carries inherent risks (infection, blood clots, implant loosening), involves significant recovery time, and should be considered only after non-surgical options have been reasonably tried.

Regenerative Treatments

Regenerative medicine approaches aim to stimulate your body’s own healing mechanisms to repair or slow the degeneration of joint tissues. These treatments are especially relevant for patients with mild to moderate OA who want to delay or avoid surgery.

PRP (Platelet-Rich Plasma)

PRP involves concentrating platelets and growth factors from your own blood and injecting them directly into the affected joint. The concentrated growth factors (including PDGF, TGF-beta, and VEGF) promote tissue healing, reduce inflammation, and may slow cartilage degradation. Multiple meta-analyses have found PRP to be superior to hyaluronic acid and cortisone injections for knee OA pain relief, with benefits lasting 6 to 12 months. PRP is most effective in mild to moderate OA (Kellgren-Lawrence grade 1 to 3).^[15]

Stem Cell Therapy (Bone Marrow Concentrate / Adipose-Derived)

Mesenchymal stem cell (MSC) therapy for OA typically involves harvesting stem cells from your bone marrow (bone marrow aspirate concentrate, or BMAC) or adipose tissue (fat), processing them, and injecting them into the joint. MSCs have anti-inflammatory and immunomodulatory properties, and they secrete growth factors that can support cartilage repair. Early clinical studies have shown improvements in pain, function, and cartilage quality on MRI. However, larger, controlled trials are still needed, and the field is evolving rapidly. Results vary significantly based on the preparation method, cell count, and the stage of OA.^[16]

Prolotherapy

Prolotherapy involves injecting a concentrated dextrose (sugar water) solution into or around the joint, triggering a localized inflammatory response that stimulates tissue repair and tightening of loose ligaments. Multiple randomized controlled trials have shown prolotherapy improves pain and function in knee OA compared to saline injection and exercise alone. It is a lower-cost regenerative option with a strong safety profile.^[17]

Hyaluronic Acid Injections (Viscosupplementation)

Hyaluronic acid (HA) is a natural component of synovial fluid that provides lubrication and shock absorption. In OA, synovial fluid becomes thinner and less effective. Viscosupplementation involves injecting HA into the joint to restore some of its lubricating properties. Results are mixed in the literature. Some patients experience meaningful relief lasting 3 to 6 months, while others see little benefit. HA injections tend to work best in early to moderate OA. They are FDA-approved for knee OA and are generally very safe.^[18]

Exosome Therapy

Exosomes are tiny vesicles (30 to 150 nm) released by cells that carry proteins, growth factors, and RNA. Exosomes derived from mesenchymal stem cells have shown anti-inflammatory and cartilage-protective effects in preclinical studies. While the science is promising, exosome therapy for OA is still in early clinical stages, and there is currently no FDA-approved exosome product for joint treatment. Patients considering exosome therapy should seek providers who are transparent about the evidence base and the regulatory status of these products.^[19]

Integrative Approaches

Weight Management

Losing weight is one of the most impactful things you can do for knee and hip OA. A landmark study found that losing just 10% of body weight reduced knee pain by 50% and significantly improved physical function. Weight loss reduces both the mechanical load on joints and the systemic inflammatory burden from adipose tissue.^[20]

Exercise and Strengthening

Despite what many people fear, exercise does not accelerate OA and is, in fact, one of the best treatments for it. Strong muscles act as shock absorbers for your joints, reducing the load on damaged cartilage. The most beneficial types of exercise for OA include:

• Strength training: Particularly quadriceps, hip, and core strengthening for knee and hip OA.
• Low-impact aerobic exercise: Walking, cycling, swimming, and elliptical training improve cardiovascular health without excessive joint stress.
• Flexibility and mobility work: Yoga, tai chi, and stretching maintain range of motion and reduce stiffness.
• Aquatic exercise: Water-based exercise reduces joint loading while providing resistance for strengthening.

The key is consistency. Even modest amounts of regular exercise (150 minutes per week of moderate activity) can significantly reduce OA symptoms.^[21]

Supplements

Glucosamine and chondroitin: These are the most widely used OA supplements. Glucosamine sulfate (1,500 mg daily) has shown modest benefits for knee OA pain in some large trials, though results are inconsistent. Chondroitin sulfate (800 to 1,200 mg daily) has also shown small-to-moderate benefits. They appear to be most effective in early to moderate OA and may take 8 to 12 weeks to show effects.^[22]

Collagen peptides: Type II collagen (undenatured, like UC-II at 40 mg daily) and hydrolyzed collagen peptides (10 g daily) have shown benefits for joint pain and function in several clinical trials. Collagen provides the building blocks for cartilage repair and may also modulate the immune response that drives cartilage destruction.

Turmeric (curcumin): Curcumin, the active compound in turmeric, has potent anti-inflammatory properties. Multiple randomized trials have found curcumin to be comparable to NSAIDs for knee OA pain relief, with fewer side effects. Look for formulations with enhanced bioavailability (phytosomal, micellar, or nano-curcumin) since standard curcumin is poorly absorbed. Doses of 500 to 1,000 mg of curcumin daily are typical.^[23]

Omega-3 fatty acids: Fish oil (providing at least 2 g of combined EPA and DHA daily) has anti-inflammatory effects and may modestly reduce OA pain and the need for NSAIDs.

Vitamin D: Low vitamin D levels are associated with increased OA risk and progression. While supplementation has not been shown to reverse OA, maintaining adequate vitamin D status (serum levels above 30 ng/mL) supports bone health and may reduce pain.

Red Light Therapy (Photobiomodulation)

Low-level laser therapy and LED-based red/near-infrared light therapy (630 to 850 nm wavelengths) have been studied for OA pain. The proposed mechanisms include reduced inflammation, improved mitochondrial function, and increased local blood flow. A meta-analysis of randomized trials found that photobiomodulation significantly reduced pain and improved function in knee OA. While not a standalone treatment, it can be a useful addition to a broader management plan.^[24]

Osteoarthritis vs. Rheumatoid Arthritis

OA and RA are fundamentally different diseases, though they can coexist.

Osteoarthritis is a degenerative condition driven primarily by mechanical and biological factors. It typically affects weight-bearing joints and the hands asymmetrically (or at least it can affect joints unequally). Morning stiffness usually lasts less than 30 minutes. X-rays show joint space narrowing, osteophytes, and sclerosis. Inflammatory markers are usually normal or mildly elevated.

Rheumatoid arthritis is an autoimmune disease in which the immune system attacks the synovium, causing systemic inflammation and joint destruction. It typically affects small joints symmetrically (both wrists, both sets of knuckles) and features prolonged morning stiffness lasting more than 30 to 60 minutes. Blood tests show elevated inflammatory markers, rheumatoid factor, and/or anti-CCP antibodies. Treatment involves immunosuppressive medications (DMARDs, biologics) rather than the approaches used for OA.^[25]

If you are unsure which type of arthritis you have, see a rheumatologist for proper evaluation. The distinction matters because the treatments are very different.

When to Consider Surgery

Joint replacement should be considered when:

• You have severe pain that limits daily activities despite consistent conservative treatment (physical therapy, weight management, medications, and injections) for at least 3 to 6 months.
• Night pain regularly disrupts your sleep.
• Your quality of life is significantly impacted, and you are avoiding activities you value.
• X-rays confirm advanced joint damage (bone-on-bone changes).
• You are medically fit enough for surgery and rehabilitation.

There is no “right” age for joint replacement, though outcomes tend to be best in patients between 55 and 75. Waiting until you are completely debilitated can actually lead to worse surgical outcomes because of muscle atrophy and deconditioning. Conversely, having surgery too early means you may need a revision (repeat replacement) later in life.

Before committing to surgery, make sure you have genuinely tried the non-surgical options. Many patients who are told they “need” a knee replacement have never done a structured physical therapy program or explored regenerative options like PRP.

Living Well with Osteoarthritis

OA is a chronic condition, but it does not have to define your life. Here are practical strategies for managing it long-term:

1. Stay active. Movement is medicine for OA. Find activities you enjoy and can do consistently. If high-impact exercise causes pain, switch to lower-impact options like cycling, swimming, or walking.
2. Strengthen your muscles. Targeted strengthening, especially of the muscles around the affected joint, is one of the most effective things you can do for pain and function.
3. Manage your weight. Even modest weight loss produces meaningful symptom improvement for knee and hip OA.
4. Use anti-inflammatory strategies. Whether through diet, supplements (curcumin, omega-3s), or treatments like PRP and photobiomodulation, reducing the inflammatory component of OA can improve symptoms.
5. Pace yourself. Learn your limits and balance activity with rest. Overdoing it one day and being bedridden the next is counterproductive. Consistent, moderate activity is the goal.
6. Protect your mental health. Chronic pain is exhausting and can lead to depression and anxiety. If you are struggling emotionally, seek support from a therapist, a support group, or your healthcare provider.
7. Build a care team. The best outcomes come from working with a team that may include your primary care physician, a rheumatologist or orthopedic surgeon, a physical therapist, and a regenerative medicine specialist.

Related Reading

• PRP Therapy: How Platelet-Rich Plasma Supports Joint and Tissue Healing
• Stem Cell Therapy for Joint Pain: What the Evidence Says
• Red Light Therapy: A Complete Guide to Photobiomodulation
• Collagen Supplements: Do They Actually Work for Joint Health?
• The Anti-Inflammatory Diet: A Practical Guide

Frequently Asked Questions

Does PRP work for osteoarthritis, and how does it compare to other injections?

Studies cited on this page found PRP (platelet-rich plasma) to be superior to hyaluronic acid and cortisone injections, with benefits typically lasting 6 to 12 months. It works by using growth factors that promote tissue healing and reduce inflammation. PRP is most effective in mild to moderate OA (Kellgren-Lawrence grade 1 to 3).

How long until each treatment starts working?

Timelines vary by approach. Cortisone injections give short-term relief lasting about 4 to 8 weeks, hyaluronic acid benefits last 3 to 6 months, and PRP benefits last 6 to 12 months. Glucosamine and chondroitin supplements may take 8 to 12 weeks to show any effect.

Can losing weight actually reduce knee osteoarthritis pain?

Yes. The page notes research showing that losing just 10% of body weight reduced knee pain by 50%. This works because weight loss reduces both the mechanical load on joints and the systemic inflammatory burden. For context, every additional pound of body weight adds roughly 4 pounds of force across the knee joint during walking.

Is stem cell or exosome therapy proven for osteoarthritis?

Not yet. For stem cell therapy, the page states that larger controlled trials are still needed, and results vary significantly based on preparation method, cell count, and stage of OA. Exosome therapy is still in early clinical stages, and there is currently no FDA-approved exosome product for joint treatment. The page advises choosing providers who are transparent about the evidence base.

Are cortisone injections safe to keep repeating?

They carry a trade-off. Cortisone provides short-term pain relief of roughly 4 to 8 weeks, but repeated injections have been associated with accelerated cartilage loss. For this reason, most guidelines recommend limiting injections to 3 to 4 per year per joint.

When should someone consider joint replacement surgery?

Joint replacement is generally reserved for advanced OA after conservative measures have failed, with over 90% of patients experiencing significant pain relief and improved function and modern implants lasting 20 to 25 years or more. It carries risks including infection, blood clots, and implant loosening. There is no single right age, though outcomes tend to be best between ages 55 and 75, and having surgery too early may mean needing a revision later, so the page advises genuinely trying non-surgical options first.

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