PRP Injections for Knee Cartilage Lesions and Chondromalacia: Can PRP Heal Cartilage?
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Written by Dr. Jeffrey Peng, MD — Board-Certified Sports Medicine Physician
Published: March 4, 2026 | Last Updated: March 4, 2026
Knee cartilage lesions — including chondromalacia and osteochondral defects — have long been considered irreversible. Once cartilage wears down or detaches, the conventional wisdom has been that it simply cannot regenerate on its own. However, emerging evidence suggests that platelet-rich plasma (PRP) injections may not only reduce pain and improve function in patients with cartilage damage, but may actually facilitate structural cartilage healing. In my practice, I have seen encouraging outcomes with PRP for patients who want to avoid or delay surgery for cartilage injuries, and the published literature is beginning to support what we are observing clinically.
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What Are Knee Cartilage Lesions and Chondromalacia?
Articular cartilage is the smooth, white tissue that covers the ends of bones within a joint. It allows nearly frictionless movement and absorbs impact during weight-bearing activities. When this cartilage is damaged — whether from acute injury, repetitive stress, or degenerative conditions — the result is a cartilage lesion.
Chondromalacia refers to the softening and deterioration of cartilage, most commonly on the undersurface of the kneecap (patella). Osteochondral defects involve damage that extends through the cartilage into the underlying bone, often resulting from conditions like osteochondritis dissecans (OCD), where a segment of bone and cartilage loses blood supply and begins to separate from surrounding tissue.
These conditions can cause persistent knee pain, swelling, catching, and limited function. Traditional treatment options range from physical therapy and anti-inflammatory medications to surgical interventions such as microfracture, osteochondral autograft transfer, or autologous chondrocyte implantation. For many patients, a less invasive approach is preferable — and that is where PRP enters the picture.
Can PRP Heal Knee Cartilage? A Groundbreaking Case Report
One of the most compelling pieces of evidence for PRP-driven cartilage healing comes from a case report published in the Journal of Cartilage & Joint Preservation (Cartilage Journal, 2023). The case involved a 37-year-old male patient with a chronic osteochondral defect in the knee. He had a history of osteochondritis dissecans and had previously undergone surgical repair in 2000, yet continued to experience significant knee pain for nearly two decades.
In 2018, seeking alternatives to additional surgery, the patient opted for a series of PRP treatments. Over the course of three years, he received four PRP injections. Remarkably, follow-up MRI scans demonstrated significant healing of the osteochondral defect. The lesion, which initially measured 2.2 by 1.4 centimeters before PRP treatment, reduced to just 0.7 by 0.5 centimeters — a substantial decrease in size.
Beyond the structural improvement seen on imaging, the patient also reported a meaningful reduction in pain and improved knee function. This case is particularly noteworthy because it represents the first published report of MRI-proven healing of an osteochondral defect achieved solely through PRP injections, without any additional surgical intervention. It challenges the longstanding belief that damaged cartilage cannot regenerate and suggests that PRP may serve as a powerful tool for facilitating actual tissue repair — not just symptom management.
PRP for Cartilage Lesions: What the Clinical Research Shows
Additional clinical research supports the use of PRP injections for patients with knee cartilage lesions. A study published in Bioengineering evaluated PRP therapy outcomes in 81 patients aged 20 to 79 with various stages of knee osteoarthritis and focal chondropathy (Verron et al., 2023). After receiving PRP injections, patients reported an average satisfaction score of 80.81 out of 100, and 52% of the study population met the OMERACT-OARSI criteria for clinically significant improvement in pain and function.
Notably, the subgroup analysis revealed that patients with early-stage osteoarthritis (Kellgren-Lawrence grades 1–2) and those over 40 years old with focal chondropathy benefited the most from PRP treatment. Improvements in WOMAC and IKDC scores — two widely used outcome measures for knee function — indicated meaningful clinical benefits across the study cohort.
These findings align with what I observe in my own practice: PRP tends to be most effective when cartilage damage is in its earlier stages, before extensive full-thickness loss has occurred. Early intervention with PRP gives patients the best opportunity for both symptom relief and potential structural benefit.
Is PRP Right for Your Knee Cartilage Injury?
While these results are very promising, it is important to acknowledge that more research is needed to fully understand the mechanisms by which PRP promotes cartilage healing and to determine how much structural regeneration is actually achievable. What the current evidence makes clear is that PRP injections offer a less invasive option compared to traditional surgical approaches, with shorter recovery times and the potential for real structural improvement.
For patients seeking alternatives to surgery for cartilage injuries, PRP presents a compelling option worth discussing with a qualified sports medicine physician. In my practice, I have seen firsthand the benefits of using PRP for cartilage lesions, and I encourage patients with chondromalacia, osteochondral defects, or early-stage knee osteoarthritis to explore this treatment. If you are interested in learning more about whether PRP injections may be appropriate for your condition, I welcome you to schedule a consultation.
References
Journal of Cartilage & Joint Preservation. MRI-proven healing of an osteochondral defect following serial platelet-rich plasma injections: A case report. J Cartil Jt Preserv. 2023. Full Text
Verron R, Zhang L, Bisseriex H, et al. SAS-PRP Study: A Real-Life Satisfaction Assessment in Patients with Cartilage Lesions of the Knee Treated by Platelet-Rich Plasma. Bioengineering (Basel). 2023;10(11):1276. doi:10.3390/bioengineering10111276
Disclaimer: This content is for educational purposes only and does not substitute for the medical advice of a physician. Always seek the advice of your physician with any questions you may have regarding your health or a medical condition. Dr. Jeffrey Peng and jeffreypengmd.com do not endorse any specific test, procedure, or product mentioned in this article.
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