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Gilbert PRP Field Guide
The white-cell question, mapped by tissue

Gilbert PRP Field Guide

Common PRP questions have short, useful answers

What matters before platelet-rich plasma, or PRP? Start with possible relief, early soreness, recovery, and cost. To make PRP, a clinic separates your blood in a spinning machine. Staff collect a layer with extra platelets, blood cells that gather around a cut.

The short answers also name symptoms that shouldn't wait.

What is PRP made from?

PRP begins as a blood sample. A spinning machine separates the sample into layers. Clinic staff collect a layer that has a higher platelet count. The clinic can also say whether the mixture keeps many white blood cells.

Does PRP work for a sore joint?

Some people report less soreness or easier movement, while others notice little change. Knee studies don't all agree. Results from a knee can't settle a shoulder question. An exam helps a doctor decide whether PRP is reasonable for the sore tissue.

Does PRP hurt more when it has white cells?

Knee studies found more short-term soreness and swelling with higher white-cell levels. The extra pain often settles on its own. More early soreness doesn't mean later relief will be better. Ask how many white blood cells the planned mixture keeps.

How long does PRP recovery take?

There isn't one timetable for every joint and tendon. Recovery changes with the sore tissue and the activity it handles. Before leaving, ask about driving, bathing, walking, lifting, and the return to usual chores.

What warning signs need quick care after PRP?

Fever with new joint heat and swelling calls for prompt help. Spreading redness, drainage, or fast-growing pain also needs care. Calf swelling may mean a clot. A pop followed by sudden weakness may mean a torn tendon.

Will insurance pay for PRP?

PRP used for joints or tendons is usually paid in cash. Medicare's national rule does not cover those uses. Other plans differ. Ask separately about payment for PRP and payment for the office visit.

What can I try before PRP?

For a worn knee, exercise and strength work often come first. Weight change, a brace, or safe medicine may help some people. A doctor can match each option to your health and state how much activity the joint can handle.

What if the soreness still does not settle?

Get an exam when soreness often returns or cuts down sleep and movement. Have medicine names and past records ready. The doctor can review home care, examine the joint or tendon, and explain whether PRP is reasonable.

Sources

  1. A Bayesian network meta-analysis of nine studies (six RCTs, 1055 patients) found leukocyte-POOR PRP produced significantly better WOMAC scores than hyaluronic acid (mean difference -21.14; 95% CI -39.63 to -2.65) and than placebo (-17.84; 95% CI -34.95 to -0.73), while leukocyte-RICH PRP showed no such significant difference versus placebo. PRP of either type caused more local adverse reactions than hyaluronic acid (OR 5.63; 95% CI 1.38-22.90), almost always local swelling and pain, with no difference in safety between the two PRP types.

    Riboh JC, Saltzman BM, Yanke AB, et al. — Effect of Leukocyte Concentration on the Efficacy of Platelet-Rich Plasma in the Treatment of Knee Osteoarthritis. American Journal of Sports Medicine, 2016. DOI: 10.1177/0363546515580787.

  2. A narrative review of PRP concluded that the literature suggests leukocyte-rich PRP is more beneficial in tendinopathies while pure (leukocyte-poor) PRP is more beneficial in cartilage pathology - but stated plainly that different PRP preparations have not been directly compared head-to-head in ANY pathology, and that the PRP type used is frequently not even stated in published research.

    Collins T, Alexander D, Barkatali B — Platelet-rich plasma: a narrative review. EFORT Open Reviews, 2021. DOI: 10.1302/2058-5241.6.200017.

  3. A systematic review and meta-analysis of adverse events in randomized trials of intra-articular PRP for knee osteoarthritis found PRP associated with mild, transient adverse events - knee pain and swelling - that typically resolve without intervention, and more frequent with LEUKOCYTE-RICH formulations. Leukocyte-poor PRP had a safety profile similar to hyaluronic acid. Knee stiffness was more frequent with PRP than with normal saline (P=.031). No severe adverse events were reported in any group.

    Nakagawa HF, Kim J, Rabinowitz J, et al. — Assessment of adverse events and safety associated with intra-articular platelet-rich plasma injections compared to other injectates for knee osteoarthritis: A systematic review and meta-analysis. PM&R, 2026. DOI: 10.1002/pmrj.70141.

  4. A systematic review of 105 clinical PRP studies in orthopaedics published 2006-2016 found that only 11 (10%) described the preparation protocol clearly enough for another investigator to repeat it, and only 17 (16%) reported any quantitative metric of the final PRP composition. The authors concluded that the current reporting of PRP preparation and composition does not allow the PRP products actually delivered to patients to be compared between studies.

    Chahla J, Cinque ME, Piuzzi NS, et al. — A Call for Standardization in Platelet-Rich Plasma Preparation Protocols and Composition Reporting: A Systematic Review of the Clinical Orthopaedic Literature. Journal of Bone and Joint Surgery (American), 2017. DOI: 10.2106/JBJS.16.01374.

  5. 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. FDA accessdata (CDRH device databases), 2003.

  6. 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. Arthritis & Rheumatology, 2020. DOI: 10.1002/art.41142.

  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). CMS.gov, 2024.

  8. In a controlled laboratory study, blood from five healthy donors was processed through three commercial PRP systems (MTF Cascade, Arteriocyte Magellan, Biomet GPS III). Platelet, red-cell and TGF-beta1 concentrations did not differ significantly between systems, but white-cell counts and PDGF-alpha-beta, PDGF-beta-beta and VEGF concentrations differed significantly across all three. Cascade produced leukocyte-poor PRP while GPS III and Magellan produced leukocyte-rich PRP with correspondingly higher white cells and growth factors.

    Castillo TN, Pouliot MA, Kim HJ, et al. — Comparison of growth factor and platelet concentration from commercial platelet-rich plasma separation systems. American Journal of Sports Medicine, 2011. DOI: 10.1177/0363546510387517.

If the soreness doesn't settle, call the clinic

At QC Kinetix (Chandler), medical providers are trained clinic staff who examine the sore area. They can review regenerative treatments with you, meaning non-surgical procedures carried out in the office. One option is PRP, which begins with a blood draw from you.

Have medicine names ready and name the sore spot. Ask which care fits the exam and what it costs. Also ask what comes after PRP if soreness remains. One number reaches the clinic: (602) 837-PAIN.

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