# Which questions matter before choosing knee PRP? *Plain Knee PRP Answers | PRP Clinic Mesa* > PRP clinic Mesa answers about results, cost, insurance, side effects, recovery, and badly worn knees. Start with the question that matters most to your next choice. In these answers, the letters PRP refer to platelet-rich plasma, which a clinic prepares by drawing some blood, using a machine to separate it, and keeping a portion with extra clot-forming platelets. You don't need to read every study before speaking with the person who'll examine you. These answers cover relief, price, insurance, side effects, recovery, and badly worn knees. Please bring any question you wish. Research can't promise one result for every knee. Your general health, medicines, joint wear, and past care all matter. An exam can connect those facts to the choices available. If an answer sounds broad, ask what it means for your own walking, sleep, or stairs. ## Sources 1. In the RESTORE trial - the largest placebo-controlled PRP trial in knee osteoarthritis - 288 adults aged 50+ with symptomatic Kellgren-Lawrence grade 2-3 medial knee OA received three weekly intra-articular injections of leukocyte-poor PRP from a commercial system or saline placebo. At 12 months the mean change in knee pain was -2.1 points with PRP versus -1.8 with saline (difference -0.4; 95% CI -0.9 to 0.2; P=.17) against a minimum clinically important difference of 1.8, and the change in medial tibial cartilage volume was -1.4% versus -1.2% (difference -0.2%; 95% CI -1.9% to 1.5%; P=.81). Twenty-nine of 31 prespecified secondary outcomes showed no significant between-group difference. The authors concluded the findings do not support use of PRP for knee OA. Bennell KL, Paterson KL, Metcalf BR, et al. — [Effect of Intra-articular Platelet-Rich Plasma vs Placebo Injection on Pain and Medial Tibial Cartilage Volume in Patients With Knee Osteoarthritis: The RESTORE Randomized Clinical Trial](https://pubmed.ncbi.nlm.nih.gov/34812863/). *JAMA*, 2021. DOI: 10.1001/jama.2021.19415. 2. A meta-analysis of 18 Level I randomized trials (811 patients receiving PRP, 797 receiving hyaluronic acid, mean follow-up 11.1 months) found mean improvement in total WOMAC scores was significantly higher with PRP (44.7%) than with hyaluronic acid (12.6%) (P<.01), and 6 of 11 VAS-reporting studies found significantly less pain with PRP at latest follow-up. Belk JW, Kraeutler MJ, Houck DA, et al. — [Platelet-Rich Plasma Versus Hyaluronic Acid for Knee Osteoarthritis: A Systematic Review and Meta-analysis of Randomized Controlled Trials](https://pubmed.ncbi.nlm.nih.gov/32302218/). *American Journal of Sports Medicine*, 2021. DOI: 10.1177/0363546520909397. 3. A meta-analysis of 34 randomized trials (1403 PRP knees, 1426 control knees) found WOMAC favoured PRP over placebo at 12 months (P=.02) and over hyaluronic acid at 6 and 12 months (P<.001), and favoured PRP over steroids on VAS pain and KOOS at 6 months. Critically, the authors reported that the superiority of PRP did NOT reach the minimal clinically important difference for any outcome, and graded the quality of evidence as low. Filardo G, Previtali D, Napoli F, et al. — [PRP Injections for the Treatment of Knee Osteoarthritis: A Meta-Analysis of Randomized Controlled Trials](https://pubmed.ncbi.nlm.nih.gov/32551947/). *Cartilage*, 2021. DOI: 10.1177/1947603520931170. 4. A meta-analysis of eight studies (648 patients, mean age 59) judged at low risk of bias found PRP significantly better than intra-articular corticosteroid for knee OA symptoms at 3, 6 and 9 months (P<0.01), with the largest effects at 6 months (SMD -0.78; 95% CI -1.34 to -0.23) and 9 months (SMD -1.63; 95% CI -2.14 to -1.12). This is the strongest available case for PRP as a longer-acting alternative to a steroid shot. McLarnon M, Heron N — [Intra-articular platelet-rich plasma injections versus intra-articular corticosteroid injections for symptomatic management of knee osteoarthritis: systematic review and meta-analysis](https://pubmed.ncbi.nlm.nih.gov/34134679/). *BMC Musculoskeletal Disorders*, 2021. DOI: 10.1186/s12891-021-04308-3. 5. The ESSKA-ICRS consensus applied the RAND/UCLA appropriateness method to 216 clinical scenarios for intra-articular PRP in knee OA. Only 84 scenarios (38.9%) were rated appropriate, 9 (4.2%) inappropriate and 123 (56.9%) uncertain. PRP was judged appropriate in patients aged 80 or under with KL grade 0-III osteoarthritis AFTER failed conservative non-injective or injective treatment; it was NOT considered appropriate as a first treatment, nor in KL grade IV (bone-on-bone) osteoarthritis, where 91.7% and 87.5% of scenarios respectively were uncertain. Kon E, de Girolamo L, Laver L, et al. — [Platelet-rich plasma injections for the management of knee osteoarthritis: The ESSKA-ICRS consensus. Recommendations using the RAND/UCLA appropriateness method for different clinical scenarios](https://pubmed.ncbi.nlm.nih.gov/38961773/). *Knee Surgery, Sports Traumatology, Arthroscopy*, 2024. DOI: 10.1002/ksa.12320. 6. The devices used to spin PRP at the point of care are cleared by FDA as clinical centrifuges, product code JQC, a Class I device under 21 CFR 862.2050 - for example the Biomet GPS Platelet Separation Kit (K030555, cleared 2003) and the Harvest SmartPrep2 / SmartPrep Platelet Concentration System (K103340, cleared 2010). That clearance covers the equipment that separates blood. It is not an FDA approval of platelet-rich plasma as a treatment for osteoarthritis, tendinopathy or any other orthopedic condition, and copy must never blur the two. U.S. Food and Drug Administration (Center for Devices and Radiological Health) — [510(k) Premarket Notification database and Product Classification: JQC, Centrifuges (Micro, Ultra, Refrigerated) For Clinical Use, 21 CFR 862.2050](https://www.accessdata.fda.gov/scripts/cdrh/cfdocs/cfPCD/classification.cfm?ID=JQC). *FDA accessdata (CDRH device databases)*, 2003. 7. Medicare's national coverage policy covers autologous platelet-rich plasma ONLY for patients with chronic non-healing diabetic, pressure and/or venous wounds, and only within an approved coverage-with-evidence-development clinical study. There is no Medicare national coverage for PRP in osteoarthritis or tendinopathy, which is why these injections are billed to the patient as cash-pay. Centers for Medicare & Medicaid Services — [Autologous Platelet-rich Plasma (Coverage with Evidence Development)](https://www.cms.gov/medicare/coverage/evidence/plasma). *CMS.gov*, 2024. 8. The 2019 ACR/Arthritis Foundation osteoarthritis guideline makes STRONG recommendations for exercise, weight loss in people with overweight or obesity, self-management programmes, tai chi, cane use, tibiofemoral bracing, topical and oral NSAIDs and intra-articular glucocorticoid injections for knee OA. Its conditional recommendations cover balance exercises, yoga, CBT, acupuncture, thermal modalities, radiofrequency ablation, acetaminophen, duloxetine and tramadol. Anything offered before a course of the strongly recommended options is being offered out of order. Kolasinski SL, Neogi T, Hochberg MC, et al. — [2019 American College of Rheumatology/Arthritis Foundation Guideline for the Management of Osteoarthritis of the Hand, Hip, and Knee](https://pubmed.ncbi.nlm.nih.gov/31908163/). *Arthritis & Rheumatology*, 2020. DOI: 10.1002/art.41142. 9. A Bayesian network meta-analysis restricted to LARGE randomized trials (at least 100 patients per group; 57 trials, 22,795 participants, 18 intra-articular interventions) found treatment effects were larger in the 35 high-risk-of-bias trials than in the 22 low/unclear-risk trials. Excluding high-risk trials, the effects of 16 of the 18 intra-articular interventions in knee or hip OA were smaller than the minimal clinically important difference and most were consistent with placebo effects; triamcinolone had the highest probability of exceeding the MID at weeks 2-6. Pereira TV, Saadat P, Bobos P, et al. — [Effectiveness and safety of intra-articular interventions for knee and hip osteoarthritis based on large randomized trials: A systematic review and network meta-analysis](https://pubmed.ncbi.nlm.nih.gov/39265924/). *Osteoarthritis and Cartilage*, 2025. DOI: 10.1016/j.joca.2024.08.014. ## Does PRP work for knee soreness? Research doesn't give one sure answer. Some studies found more relief with PRP than with cortisone or gel medicine placed in the knee at three, six, and nine months. In one large study, PRP didn't ease soreness or improve daily use more than sterile salt water at twelve months. After an exam, you can decide whether that uncertain chance is worth the cost and recovery. ## What affects PRP injection cost? Each clinic sets its price, and we can't support one fair average. Ask for a written total before you choose a date. It may include the exam, blood preparation, procedure, and later checks. You'll want to know whether any return visit adds another charge. ## Is PRP covered by insurance? People often pay the whole knee PRP bill themselves. Coverage varies, so call your own plan before booking. Don't count on repayment unless the plan confirms it in advance. The clinic can tell you the amount you would owe. ## What PRP injection side effects can happen? The knee may be sore or swollen for a short time. A procedure that enters the joint also brings a small infection risk. Before leaving, ask what is expected and what isn't. Be sure you know whom to call if warmth, redness, fever, or soreness gets worse. ## What is a usual PRP injection recovery time? There isn't one calendar for every knee or clinic method. The person who examines you may limit activity first, then guide your return. Ask about walking, driving, and exercise before the procedure. That gives you time to arrange a ride or help at home. ## Can PRP help when my knee is bone on bone? PRP is less certain when the joint is badly worn. A surgery visit can explain joint replacement before you pay for PRP. That conversation doesn't require you to have surgery. It lets you compare the likely relief, recovery, and timing of both choices. ## Would a clinic conversation help? You're welcome to bring medicine names, old knee records, and the activity you most want back. The clinic can explain the exam, available care, and full cost before you decide. There's time for questions. One number reaches the clinic team: (602) 837-PAIN. Book a free consultation: --- Practical help for a knee that keeps bothering you. Clear help for knee soreness, from care at home to an exam and PRP. Clear help for knee soreness, from care at home through a clinic visit. This site is operated by the owners of the QC Kinetix Phoenix-area clinics, the clinic group recommended on these pages, and the business may benefit when a reader books. © 2026 Mesa PRP Counter. General education about PRP and knee decisions, not medical advice for an individual case.