Corticosteroid injections, commonly called cortisone shots, are widely used in orthopedic medicine to reduce joint inflammation and relieve pain. They are frequently recommended for conditions such as knee osteoarthritis, shoulder inflammation, and tendonitis.

In many cases, cortisone injections can provide rapid symptom relief. However, research over the past decade has raised concerns that repeated steroid injections may accelerate cartilage breakdown, particularly when used frequently in weight-bearing joints such as the knee.

Because cartilage has limited ability to repair itself, preserving joint tissue is critical for long-term joint health. Understanding how corticosteroids interact with cartilage helps explain why most orthopedic specialists limit how often these injections are used.

What Cartilage Actually Does in Your Joint

Articular cartilage is the smooth, protective tissue that covers the ends of bones within a joint. Its primary functions include:

• Allowing bones to glide smoothly during movement
• Distributing mechanical load across the joint
• Absorbing shock during walking, running, and jumping

Unlike many other tissues in the body, cartilage does not have its own blood supply. Instead, it relies on diffusion of nutrients from the surrounding joint fluid.

This lack of blood circulation means cartilage has very limited ability to regenerate after damage. Once cartilage begins to deteriorate, the process often progresses gradually over time.

How Cortisone Works Inside a Joint

Corticosteroids are powerful anti-inflammatory medications. When injected into a joint, they work by suppressing several inflammatory pathways.

Key mechanisms include:

• Reducing inflammatory cytokines
• Decreasing immune cell activity
• Lowering production of inflammatory enzymes
• Suppressing prostaglandins that cause pain and swelling

Because inflammation is a major driver of joint pain, this suppression often leads to rapid symptom relief within days. However, these same anti-inflammatory effects may also interfere with normal cartilage metabolism.

Why Steroids Can Harm Cartilage Cells

Cartilage is maintained by specialized cells called chondrocytes. These cells are responsible for producing and maintaining the extracellular matrix that gives cartilage its structure and elasticity.

Laboratory studies show that corticosteroids can negatively affect these cells in several ways:

• Reduced chondrocyte activity
  Steroids can suppress the metabolic activity of cartilage cells, reducing their ability to maintain healthy cartilage tissue.
• Increased cartilage matrix breakdown
  Corticosteroids may increase enzymes that degrade the cartilage matrix, accelerating structural deterioration.
• Reduced collagen and proteoglycan production
  Cartilage relies on structural molecules such as type II collagen and proteoglycans. Steroids may decrease the production of these essential components.

Over time, these effects may contribute to progressive cartilage thinning.

Clinical Studies Linking Steroid Injections to Cartilage Loss

Several clinical studies have examined the long-term effects of repeated corticosteroid injections in osteoarthritis.

One well-known randomized clinical trial published in JAMA (2017) compared patients receiving knee steroid injections every three months with those receiving placebo saline injections.

After two years, researchers observed that patients receiving repeated corticosteroid injections had greater cartilage volume loss on MRI compared with the placebo group, without significant long-term improvement in pain.

This finding raised concerns about the long-term structural effects of repeated steroid use in degenerative joints.

Why Orthopedic Doctors Limit Steroid Injections

Because of these concerns, many orthopedic specialists recommend limiting steroid injections.

Common clinical guidelines include:

• Avoid frequent injections into the same joint
• Space injections several months apart
• Limit total lifetime injections in a joint
• Avoid steroids in joints with advanced cartilage damage

The goal is to balance short-term pain relief with long-term joint preservation.

Steroid injections can still play an important role in certain situations, particularly when severe inflammation must be controlled quickly. However, they are usually considered a symptom-management tool rather than a regenerative treatment.

When Cortisone May Still Be Useful

Despite the potential risks, cortisone injections can still be appropriate in specific clinical situations.

Examples include:

• Severe inflammatory flare-ups of osteoarthritis
• Acute bursitis or tendon inflammation
• Frozen shoulder
• Rheumatoid arthritis flares

In these cases, the primary goal is rapid reduction of inflammation, which can allow rehabilitation and physical therapy to begin.

However, repeated injections without addressing the underlying joint degeneration may not provide sustainable long-term results.

Treatments That Aim to Protect Cartilage

Because cartilage degeneration is a progressive process, modern orthopedic care increasingly focuses on preserving joint tissue rather than only suppressing symptoms.

Approaches that may support joint health include:

• Physiotherapy to improve joint mechanics
• Weight management to reduce joint load
• Platelet-rich plasma (PRP) injections
• Regenerative medicine approaches such as mesenchymal stem cells (MSCs)

Unlike corticosteroids, these approaches aim to support tissue repair or improve the joint environment, rather than suppress inflammation alone.

Corticosteroid injections remain an important tool in orthopedic medicine for managing joint inflammation and pain. However, increasing evidence suggests that frequent steroid injections may accelerate cartilage deterioration, particularly in degenerative conditions such as osteoarthritis.

For this reason, many specialists recommend limiting steroid use and focusing on strategies that help preserve joint structure and long-term function.

Understanding the benefits and limitations of each treatment option allows patients and physicians to make more informed decisions about joint health.

About EDNA Wellness

EDNA Wellness is a private Stem Cell Clinic and Regenerative Medicine Center in Bangkok, Thailand, specializing in Umbilical cord–derived Mesenchymal Stem Cells (UC-MSCs) for knee osteoarthritis and joint pain, stroke and other neuro-related conditions, and stem cell IV infusions for longevity and healthy aging. All treatments are doctor-designed and performed in a sterile clinical setting

For more information or to book a consultation:

LINE: @ednawellness

WhatsApp: +66 (0) 64 505 5599

Website: www.ednawellness.com

References

• McAlindon TE, LaValley MP, Harvey WF, et al.Effect of Intra-articular Triamcinolone vs Saline on Knee Cartilage Volume and Pain in Patients With Knee Osteoarthritis. JAMA. 2017. https://jamanetwork.com/journals/jama/fullarticle/2626573
• Egamen Ayhan et al. Intraarticular injections (corticosteroid, hyaluronic acid, platelet rich plasma) for the knee osteoarthritis https://pmc.ncbi.nlm.nih.gov/articles/PMC4095029/