Knee Cartilage Injury (Focal Chondral Defect)

Common Symptoms

• Deep knee pain, often worse with activity, particularly pivoting or deep knee bending
• Swelling, especially after activity
• A catching, locking, or giving-way sensation in some cases, if a fragment is unstable
• Pain that may not correlate perfectly with how the knee looks or feels between flare-ups
• A history of a prior knee injury, twisting event, or sport involving repetitive pivoting in many cases

Why It Happens

Articular cartilage covers the ends of bones within the knee joint and has very limited capacity to heal itself once damaged, because it lacks a direct blood supply. A focal defect can result from a single traumatic event (such as a twisting injury or dislocation) or from repetitive joint stress over time, and once cartilage is damaged in a specific spot, that area doesn't reliably regenerate on its own the way most other tissues do.

Why It Can Become Persistent

Cartilage's limited blood supply and healing capacity means a chondral defect generally does not resolve simply with rest, which is different from most soft-tissue conditions on this site — this is a structural joint problem, and understanding that distinction is central to setting realistic expectations for any treatment, including shockwave therapy.

Who Commonly Gets It

This is seen in athletes with a history of knee injury or repetitive pivoting/loading sports, as well as in people with progressive joint wear over time. It can occur alongside other knee injuries, such as a meniscus tear or ligament injury.

How It Is Usually Diagnosed

Diagnosis requires MRI to characterize the size, depth, and location of the cartilage defect, along with a clinical exam. This is a structural diagnosis that an orthopedic surgeon or sports medicine physician typically stages formally, since defect size and depth significantly affect which treatments are appropriate.

Traditional Treatment Options

• Activity modification: Reducing high-impact or pivoting activity that aggravates the joint.
• Physical therapy: Strengthening surrounding muscles to reduce joint load and improve mechanics.
• NSAIDs: Used for symptom control.
• Injections (corticosteroid, hyaluronic acid, or orthobiologics): Considered in some cases for symptom management; evidence and appropriateness vary by defect characteristics.
• Surgical cartilage restoration (microfracture, OATS, cartilage transplantation): For appropriate candidates — particularly larger or symptomatic defects in active individuals — surgical options aim to restore or replace the damaged cartilage directly and are the most established treatment for significant defects.

Why Someone Might Start Looking for Another Option

Surgical cartilage procedures involve real recovery time and aren't right for every defect or every patient, and people looking to avoid or delay surgery sometimes ask about non-surgical options that might support the joint while they weigh their choices.

Where Shockwave Therapy May Fit

The evidence for shockwave therapy in focal knee cartilage defects specifically is limited to a single observational/retrospective report in athletes, cited in a manufacturer-compiled compendium rather than published independently in a peer-reviewed journal. This is a much thinner evidence base than for the tendinopathies on this site, and we want to be direct about that: shockwave therapy is not established treatment for a structural cartilage defect, and it is not a substitute for proper staging and, when appropriate, surgical evaluation.

How Shockwave Treatment Works for This Area

This would only be considered as a possible adjunct after appropriate imaging and orthopedic input on the defect's size and severity — never as a first step or a substitute for that evaluation. Your provider will be direct with you about how limited the evidence is for this specific use.

What the Treatment Feels Like

Most patients describe a firm tapping or pressure sensation around the knee; specifics would depend heavily on your individual evaluation.

What Happens During Your First Visit

Your visit begins with a provider evaluation focused on your history and a physical exam relevant to your complaint. If shockwave therapy is determined to be clinically appropriate, your first treatment can typically be provided the same visit. See our What to Expect page for the full walkthrough.

Who May Not Be Appropriate

• Anyone who has not yet had MRI imaging and orthopedic evaluation to characterize the cartilage defect
• Larger or unstable cartilage defects, mechanical locking symptoms, or defects accompanied by significant joint instability, which typically need surgical evaluation
• Active infection, open wounds, or certain bone conditions at the treatment site
• Certain circulatory, neurological, or bleeding-related conditions, per your provider's screening

This list is not exhaustive. Your provider will screen for contraindications during your evaluation.