# PRP results aren't the same for every joint *Does PRP Work? | PRP Therapy Chandler* > Does PRP work? This PRP therapy chandler guide shows why each sore body part needs its own answer and exam. Does PRP work for every sore joint? No, and results differ for knees, shoulders and tendons. PRP is the platelet-rich layer saved after a machine separates the patient's blood. Platelets are small blood pieces involved in clotting and early repair. Knee arthritis has been studied more than most joint problems. One large study found the same results with PRP and a shot of sterile salt water. The answer still depends on what hurts and why. Ask about research on that aching area, not PRP as a whole. ## Knee results remain mixed Several knee studies reported milder aches or smoother movement after PRP. Other strong research found no clear gain, so relief isn't certain. Higher platelet counts were tied to milder soreness or smoother movement in some studies. Even then, a count can't predict one person's relief. Use a real task, perhaps walking farther, to judge progress. Ask how the office will check that task after care begins. ## Shoulders and tendons need separate answers Knee findings can't settle care for a shoulder or the thick heel tendon. Tendon care also depends on the injury and a sound exercise plan. Biologic therapies may come up at QC Kinetix; here that can mean PRP prepared from blood by trained medical providers. Any choice still needs to match the exam and the research. Ask whether people in the study hurt less or moved more easily. Those answers mean more than a broad claim that PRP worked. ## Basic care still matters The cause decides whether slower activity, strength work or medicine may help. Some knees feel steadier in a brace, while guided exercise may help a sore tendon. That care may work alone or continue after another treatment. If soreness remains, note which care eased it and which failed. Name the activity that still causes trouble. Your walking time or reach can be checked after care begins. ## Sources 1. A systematic review and meta-analysis of platelet dosage across musculoskeletal conditions identified a potential dose-response relationship in knee osteoarthritis, with an apparent threshold above 10 billion platelets for favourable clinical outcomes, and the effect more pronounced for function than for pain. For conditions other than knee OA the authors found the literature too unclear to identify an optimal dose. Berrigan W, Tao F, Kopcow J, et al. — [The Effect of Platelet Dose on Outcomes after Platelet Rich Plasma Injections for Musculoskeletal Conditions: A Systematic Review and Meta-Analysis](https://pubmed.ncbi.nlm.nih.gov/39331322/). *Current Reviews in Musculoskeletal Medicine*, 2024. DOI: 10.1007/s12178-024-09922-x. 2. 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. 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. 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. 5. 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. 6. The American Academy of Physical Medicine and Rehabilitation convened a technical expert panel that ran a structured literature review (2023, updated through June 2025) and a modified Delphi process, and issued five evidence-based clinical recommendations plus 11 consensus-based best practices for PRP in knee osteoarthritis. The statement is explicit that orthobiologic therapies 'remain an evolving area of practice' and that robust, dose-dependent randomized controlled trials are still needed to establish PRP's clinical effects. Borg-Stein J, Jayaram P, Colorado BS, et al. — [AAPM&R guidance statement on platelet rich plasma for knee osteoarthritis](https://pubmed.ncbi.nlm.nih.gov/41989317/). *PM&R*, 2026. DOI: 10.1002/pmrj.70144. 7. 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. ## A visit can sort out the cause The Chandler office can review the sore joint, medicines and earlier care. There is no charge for the consultation. Bring one activity that soreness now limits. Call (602) 837-PAIN or visit 1100 S. Dobson Rd., Suite 210. Book a free consultation: --- Clear answers for a sore joint. PRP therapy chandler information on aching joints, simple relief, warning signs, treatment choices and local care. Clear facts about joint soreness, PRP and the Chandler clinic. This site is operated by the owners of the QC Kinetix Phoenix-area clinics, including the Chandler location recommended here, and the business benefits when readers book a consultation. Copyright 2026 Chandler PRP Clarity. This is general health education; it supplies neither a diagnosis nor personal medical advice.