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Does PRP Regrow Cartilage? Separating the Science from the Marketing

Systematic Review / Meta-Analysis
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Dr. Paul Tortland, DO, Dual-Board Certified in Sports Medicine & Regenerative Medicine
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Does PRP Regrow Cartilage? Separating the Science from the Marketing
Written and Medically Reviewed by Dr. Paul Tortland, DO, FAOASM, CAQSM, RMSK, Dual-Board Certified in Sports Medicine & Regenerative Medicine
·
October 18, 2026
What You Need to Know

No. Despite marketing claims, platelet-rich plasma (PRP) does not regrow lost articular cartilage. PRP is a concentrate of a patient's own platelets and growth factors that can calm joint inflammation and improve pain and function in many patients with early-to-moderate arthritis, but it does not regenerate hyaline cartilage or reverse structural joint damage on imaging.

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Dr. Paul Tortland, DO provides comprehensive orthopedic evaluations for patients at his Glastonbury, CT office. The practice sees patients from Glastonbury, Hartford, West Hartford, Farmington, Simsbury, South Windsor, and other Connecticut and New England communities.

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Short answer: no. Despite how it is sometimes marketed, platelet-rich plasma (PRP) does not regrow lost articular cartilage. PRP is a concentration of a patient's own platelets and their growth factors, and it can meaningfully calm joint inflammation and improve pain and function for many patients with early-to-moderate arthritis. But regenerating true hyaline cartilage, the smooth, shock-absorbing tissue that cushions a joint, is a different biological problem, and current evidence does not show that PRP solves it.

Why Cartilage Is So Hard to Regrow

Articular cartilage is unlike almost every other tissue in the body. It has no blood supply, no nerve supply, and only a sparse population of cells (chondrocytes) scattered through a dense matrix. That lack of blood flow is why cartilage heals so poorly after injury or wear: the body cannot deliver its usual repair machinery the way it can to skin, muscle, or bone.

This matters when evaluating any treatment that claims to "regenerate" cartilage. When a treatment does show benefit, it is worth asking what is actually improving. Pain, inflammation, and function are not the same thing as new cartilage.

What PRP Actually Does, Biologically

PRP is created by drawing a patient's blood and processing it to concentrate the platelets. In our practice, PRP is prepared to roughly 12 to 15 times baseline concentration. Platelets carry growth factors, including PDGF, TGF-β, VEGF, and IGF-1, along with signaling proteins that influence the joint environment once injected.

In laboratory and animal studies, these factors reduce inflammatory signals (such as IL-1β and TNF-α) that drive cartilage breakdown in osteoarthritis, and they can stimulate chondrocytes to produce matrix proteins. That is a real and plausible mechanism, but it is an anti-inflammatory and cartilage-protective effect on existing tissue, not a process of building new cartilage. The gap between influencing cells in a dish and regrowing a meaningful thickness of cartilage in a human knee has not been closed.

Who May Benefit From PRP

Even without regrowing cartilage, PRP has a legitimate role for the right patient. Good candidates typically include people with:

PRP is generally a poor fit for advanced, bone-on-bone arthritis, where there is little cartilage or joint space left to protect.

What the Current Evidence Shows

A systematic review and meta-analysis in Osteoarthritis and Cartilage Open (Prodromidis et al., 2022) examined 14 studies with 1,099 patients that measured cartilage on cross-sectional imaging before and after PRP. PRP was not associated with a significant increase in cartilage thickness, and in the randomized trials, cartilage content did not change significantly compared with no PRP. The authors recommended that PRP not be given with the intention of growing cartilage.

A separate meta-analysis in the Journal of Arthroplasty (Sax et al., 2022) reviewed 24 studies. PRP improved pain and function scores in most comparisons with hyaluronic acid, corticosteroid, and saline, although heterogeneity between studies was high. When structural changes were assessed, including cartilage thickness on MRI, no differences were found.

This pattern, real symptomatic benefit without structural regeneration, is the most accurate way to describe what PRP does for arthritic joints. Not all PRP is prepared the same way, and differences in concentration, white blood cell content, technique, and number of treatments likely explain some of the inconsistency across studies.

When Non-Surgical Care May Be the Right Next Step

For early-to-moderate arthritis, where the goals are less pain, better function, and staying active, a comprehensive non-surgical plan is often reasonable. It may include PRP alongside physical therapy, activity modification, weight management where relevant, and other orthobiologic options. The goal is symptom control and function, not tissue regeneration, and patients should understand that before starting.

When Surgery May Be More Appropriate

When imaging and examination show advanced, bone-on-bone arthritis with significant deformity or instability, when pain and function remain severely limited despite a genuine trial of non-surgical care, or when there is a structural problem, such as a large unstable meniscus tear or significant ligament injury, referral to an orthopedic surgeon is the responsible recommendation. Dr. Tortland refers for surgical evaluation whenever that is in the patient's best interest.

What PRP Does Not Do

Dr. Tortland's Perspective

I hear this question often, and patients deserve a straight answer: PRP does not regrow cartilage, and I do not want anyone choosing this treatment because they were told it would. What PRP can do, when it is prepared properly and used in the right patient, is calm the inflammatory environment in a joint and meaningfully improve pain and function. For the right person, that is a valuable outcome. My approach is the same in every case: validate that the pain is real, investigate the cause with a thorough evaluation and diagnostic ultrasound, and discuss every option, including surgery when that is the better path, before recommending regenerative treatment.

Related Questions

Next Step

If you are dealing with joint pain and want an honest, evidence-based conversation about whether PRP or another treatment fits your situation, start with a thorough evaluation, not a sales pitch. Schedule a consultation for a clear diagnosis, a live musculoskeletal ultrasound exam, and a realistic discussion of every option, surgical and non-surgical.

Comparison at a Glance

TreatmentMechanismDurationBest Candidate Stage
PRP (platelet-rich plasma)Concentrated platelets and signaling proteins may reduce inflammation and support the existing joint environmentRelief can last months; repeat treatment may be neededEarly-to-moderate osteoarthritis with meaningful cartilage/joint space remaining
Physical therapy / activity modificationImproves strength, movement, loading, and function without changing joint structureOngoing; benefits depend on continued participationAll stages, especially as foundational care
BMA / cellular orthobiologicsAutologous bone-marrow-derived cells and signaling factors may modulate the local environmentVariable; studied outcomes generally extend months to a year or longerSelected patients with more advanced disease or when PRP is not sufficient
Joint replacementRemoves and replaces severely damaged joint surfacesLong-term durable treatmentAdvanced bone-on-bone disease, deformity, instability, or persistent severe symptoms despite non-surgical care

Frequently Asked Questions

Does PRP regenerate or regrow cartilage?

No. Current clinical and imaging-based evidence does not show that PRP regrows articular cartilage. PRP can reduce joint inflammation and improve pain and function for many patients, but it does not rebuild lost cartilage tissue. Any claim that PRP "regrows" cartilage goes beyond what the research currently supports.

If PRP doesn't regrow cartilage, why would I get it?

Because pain relief and improved function are valuable outcomes on their own, even without structural regeneration. For patients with early-to-moderate arthritis, PRP's anti-inflammatory and chondroprotective effects can meaningfully reduce symptoms and help someone stay active for months, sometimes longer — which for many patients is a worthwhile result while continuing to protect the joint.

Is PRP a substitute for a knee or hip replacement?

Not for everyone. PRP is generally most useful in earlier-stage arthritis where meaningful cartilage and joint space remain. In advanced, bone-on-bone arthritis, PRP cannot rebuild what has already been lost, and joint replacement or another surgical option may genuinely be the better choice. Dr. Tortland will tell you directly when that's the case.

How long do PRP results typically last?

Results vary by patient, joint, and disease severity, but published studies generally describe symptomatic benefit lasting from several months up to roughly a year for many patients. Results are not guaranteed or permanent, and some patients choose to repeat treatment periodically to maintain benefit.

Why do some clinics advertise PRP as regrowing cartilage if the evidence doesn't support it?

Marketing language sometimes outpaces the actual science, particularly in the regenerative medicine space. That's exactly why an honest, evidence-based explanation matters: patients should choose PRP because it can meaningfully improve pain and function, not because of an unsupported claim about tissue regeneration.

Can PRP slow down arthritis progression even if it doesn't regrow cartilage?

This remains an area of active research. Some evidence suggests PRP may help manage pain and function in earlier-stage arthritis, but current evidence doesn't establish that it reliably slows the underlying structural progression of osteoarthritis.

Should I expect my MRI to look different after PRP treatment?

Not necessarily. Because PRP's documented benefit is primarily symptomatic rather than structural cartilage regrowth, a follow-up MRI often won't show dramatic structural change even in patients who feel meaningfully better.

If PRP won't regrow my cartilage, why would a doctor recommend it?

The goal is realistic: reducing pain and improving function for appropriately selected patients, which can meaningfully improve quality of life and delay or avoid surgery, even without reversing the structural cartilage loss already present.

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Portrait of Dr. Paul Tortland, DO

Dual-Board-Certified · Fellowship-Trained · Specialist in Regenerative Orthopedics

About Paul D. Tortland, DO

Dr. Paul Tortland was the first physician in southern New England to offer PRP and BMA + MFAT stem cell treatments for Orthopedic injuries, treating patients since 2007 with a customized, ultrasound-guided approach and measured, high-concentration PRP preparations at his Glastonbury, CT practice.

References & Further Reading

View 2 medical references and further reading
  1. Prodromidis AD, et al. The role of Platelet-Rich Plasma (PRP) intraarticular injections in restoring articular cartilage of osteoarthritic knees: a systematic review and meta-analysis. Osteoarthr Cartil Open. 2022;4(4):100318. doi:10.1016/j.ocarto.2022.100318
  2. Sax OC, et al. The Efficacy of Platelet-Rich Plasma for the Treatment of Knee Osteoarthritis Symptoms and Structural Changes: A Systematic Review and Meta-Analysis. J Arthroplasty. 2022;37(11):2282-2290. doi:10.1016/j.arth.2022.05.014

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