# Which questions come up about joint soreness and orthobiologics, the shots made from blood or tissue? *Frequently Asked Questions | Orthobiologics Glendale* > Orthobiologics Glendale FAQ: plain answers about an aching joint, PRP, comfort measures, nearby offices, urgent symptoms, and prices. These questions often come to an office visit about orthobiologics, meaning shots that use your blood, fat, pelvic marrow, or tissue supplied by a donor. We’ll keep each answer direct. Your own doctor’s advice still matters. ## Sources 1. Blood from seven donors was processed through five commercial PRP systems (Arthrex Angel, Emcyte Genesis CS, Arteriocyte Magellan, Harvest SmartPrep, Biomet GPS III). White-cell concentration ranged from 11.0 to 27.3 thousand/uL between systems, neutrophil concentration from 0.6 to 9.4 thousand/uL, red-cell concentration from under 1.1 to 3.2 million/uL, and pH from 6.95 to over 7.26. The authors advise caution in interpreting clinical PRP results because the product itself differs by device. Degen RM, et al. — [Commercial Separation Systems Designed for Preparation of Platelet-Rich Plasma Yield Differences in Cellular Composition.](https://pubmed.ncbi.nlm.nih.gov/28167878/). *HSS Journal*, 2017. DOI: 10.1007/s11420-016-9519-3. 2. A single-donor comparison of five PRP preparations (RegenPRP, Mini GPS III, Selphyl, Arthrex ACP and a laboratory protocol) across ten donors found two systems produced leukocyte-RICH PRP with higher red-cell, white-cell and neutrophil proportions while three produced leukocyte-poor PRP, and that platelet and growth-factor doses varied substantially between devices, with platelet dose positively correlated with every growth factor measured. Magalon J, et al. — [Characterization and comparison of 5 platelet-rich plasma preparations in a single-donor model.](https://pubmed.ncbi.nlm.nih.gov/24725317/). *Arthroscopy*, 2014. DOI: 10.1016/j.arthro.2014.02.020. 3. A meta-analysis of the PLACEBO arms of 73 double-blind trials (5,895 patients) quantified what a saline knee injection alone achieves: statistically and clinically significant improvement in pain, function and quality of life at 1, 3 and 6 months, with responder rates exceeding 50% at all three time points, peaking around 4-8 months and declining by 12 months. Placebo response was stronger in trials with more female participants and in more recently published trials. Previtali D, et al. — [Placebo response to intra-articular injections in knee osteoarthritis: magnitude, evolution over time, and influencing factors. A systematic review and meta-analysis with meta-regression.](https://pubmed.ncbi.nlm.nih.gov/41031623/). *EFORT Open Reviews*, 2025. DOI: 10.1530/EOR-2025-0022. 4. The largest head-to-head trial of cell-based orthobiologics to date randomised 480 patients with KL II-IV knee OA across four arms: autologous bone marrow aspirate concentrate, autologous adipose stromal vascular fraction, allogeneic umbilical cord tissue-derived MSCs, and a corticosteroid injection control. At 12 months NONE of the three orthobiologic injections was superior to another or to the corticosteroid control on either co-primary endpoint (VAS pain, KOOS pain), and none of the four groups showed a significant change in MRI osteoarthritis score from baseline. No procedure-related serious adverse events were reported. Mautner K, et al. — [Cell-based versus corticosteroid injections for knee pain in osteoarthritis: a randomized phase 3 trial.](https://pubmed.ncbi.nlm.nih.gov/37919438/). *Nature Medicine*, 2023. DOI: 10.1038/s41591-023-02632-w. 5. The ESSKA-ORBIT European consensus on blood-derived orthobiologics graded 28 question-statement sets; only 9 of 28 had high-level scientific support. Three statements reached grade A: that there is enough preclinical and clinical evidence to support PRP use in knee OA; that clinical evidence shows effectiveness in MILD TO MODERATE knee OA (KL grade 3 or lower); and that PRP provides a longer effect than the short-term effect of corticosteroid with a safer profile. The panel regarded PRP as a valid and possible first-line injectable option for KL grades 1-3. Laver L, et al. — [The use of injectable orthobiologics for knee osteoarthritis: A European ESSKA-ORBIT consensus. Part 1-Blood-derived products (platelet-rich plasma).](https://pubmed.ncbi.nlm.nih.gov/38436492/). *Knee Surgery, Sports Traumatology, Arthroscopy*, 2024. DOI: 10.1002/ksa.12077. 6. FDA states verbatim of stem cell products, stromal vascular fraction (adipose-derived cells), umbilical cord blood, Wharton's jelly, amniotic fluid and exosome products: 'None of these products have been approved for the treatment of any orthopedic condition, such as osteoarthritis, tendonitis, disc disease, tennis elbow, back pain, hip pain, knee pain, neck pain, or shoulder pain.' The only FDA-approved stem cell products in the United States are blood-forming (hematopoietic progenitor) cells derived from umbilical cord blood, approved only for disorders of blood production, and there are currently NO FDA-approved exosome products. U.S. Food and Drug Administration — [Consumer Alert on Regenerative Medicine Products Including Stem Cells and Exosomes](https://www.fda.gov/vaccines-blood-biologics/consumers-biologics/consumer-alert-regenerative-medicine-products-including-stem-cells-and-exosomes). *FDA (Center for Biologics Evaluation and Research)*, 2020. 7. Medicare's national coverage determination states that CMS covers autologous platelet-rich plasma ONLY for patients with chronic non-healing diabetic, pressure and/or venous wounds, and only inside an approved coverage-with-evidence-development clinical study. Every approved study listed under the NCD is a wound-healing study. There is no Medicare national coverage for PRP in osteoarthritis or tendinopathy, which is why these injections are billed to the patient. 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 AAOS patient-education FAQ on orthobiologics states that because orthobiologics are relatively new the evidence supporting their use is LIMITED, that rigorous testing of effectiveness in most orthopedic conditions is lacking, and that preliminary results are encouraging but hard to evaluate. It names tendinopathies such as tennis elbow, pain from early knee osteoarthritis, adjunct healing after rotator cuff repair, and avascular necrosis as the settings where biologic therapies have shown promise, and notes that stem cell treatments not derived from the patient's own body and further manipulated in a laboratory can only be offered inside an FDA-approved clinical trial. American Academy of Orthopaedic Surgeons — [Orthobiologics (Regenerative Medicine) FAQ](https://www.orthoinfo.org/treatment/orthobiologics-faq/). *OrthoInfo (AAOS)*, 2024. ## Why does a joint grow sore after normal use? Long use may leave a joint stiff, while an old injury can add to the ache. A tendon may also become sore after extra work. Stairs, overhead reaching, or longer walks can bring the soreness out. If it keeps returning, an exam may help name the cause. ## What can help a sore joint at home? You can ease back from the motion that started the soreness while keeping some easy movement. A warm or cold pack may bring comfort. Supportive shoes can steady a sore knee or hip. If the joint isn’t improving, you may wish to arrange an exam. ## Which warning signs need urgent care? A hot, swollen joint with fever or an ill feeling needs medical care that day. After a hard fall, seek care soon if the joint looks bent, locks, or cannot bear weight. New weakness, numbness, or quickly rising pain shouldn’t wait. Urgent care is the proper place for these signs. ## Does PRP work when it uses platelets kept from my spun blood? The letters PRP stand for platelet-rich plasma. After a blood draw, a spinning machine separates a small portion holding many platelets for a shot into the sore joint or tendon. Research doesn’t give one answer for every joint. The exam and your health history help the provider explain whether it may fit. ## What do biologic injections—shots made from blood or tissue—cost in Arizona? There isn’t one price because the material and number of visits can differ. You can ask for a written quote covering the procedure, supplies, and later checks. Ask whether more care would cost extra. There’s time to read the price before deciding. ## What if the soreness doesn’t settle? When soreness hasn’t eased, you can arrange a visit with QC Kinetix. The licensed clinician who checks the joint is your medical provider. Regenerative treatments are office procedures that use a needle to place material from blood or body tissue into the sore area. You’re welcome to ask about PRP, concentrated PRP, recovery, cost, and later care. ## What if your joint is still sore? At its Phoenix-area offices, QC Kinetix has visits for people whose joints remain sore. A licensed clinician, called a medical provider here, discusses regenerative treatments after the exam. These office procedures use a needle to place material from blood or body tissue into the sore area. The Peoria office serves the Loop 101 side of Glendale, while Banner Estrella may suit Westgate and the south side. You can call with questions about the exam, price, recovery, and later care. One number reaches both offices: (602) 837-PAIN. You’re welcome to take time before deciding. Nothing needs to be rushed. Book an appointment: --- A comfortable place to begin when a joint keeps aching. A Glendale guide to aching joints, simple comfort measures, reasons for urgent care, office visits, and choices that avoid an operation. Clear help for sore joints, simple care at home, urgent signs, and nearby visits. This site is operated by the owners of the QC Kinetix Phoenix-area clinics, including the Peoria and Banner Estrella locations described here, and those owners benefit when readers book with their clinics. © 2026 Glendale Orthobiologics Guide. General health education and local access context, not personal medical advice or a diagnosis.