# What do people ask about a sore knee? *Knee Questions — Knee Pain Treatment Glendale* > Straight answers about knee injections, PRP, home care, urgent symptoms, cost, and knee pain treatment Glendale choices. ## Can I get a straight answer? Glendale shopping areas can mean a long walk from the car. Your knee may ache before you finish the errand. The answers below cover the questions people ask after soreness hangs around. I’d want the short answer first, so that’s what you’ll get. This page can’t tell what is wrong with your knee. It’ll help you pick a home measure or a plain question for the appointment. ## Sources 1. In a 2-year, double-blind RCT of 140 patients with symptomatic knee OA and ultrasound synovitis, intra-articular triamcinolone 40 mg every 12 weeks caused significantly GREATER cartilage volume loss than saline (index-compartment cartilage thickness change -0.21 mm vs -0.10 mm; between-group difference -0.11 mm, 95% CI -0.20 to -0.03) with NO significant difference in pain (-1.2 vs -1.9 on the WOMAC Likert pain subscale). McAlindon TE, LaValley MP, Harvey WF, et al. — [Effect of Intra-articular Triamcinolone vs Saline on Knee Cartilage Volume and Pain in Patients With Knee Osteoarthritis: A Randomized Clinical Trial.](https://pubmed.ncbi.nlm.nih.gov/28510679/). *JAMA*, 2017. DOI: 10.1001/jama.2017.5283. 2. A Bayesian network meta-analysis restricted to LARGE randomized trials (>=100 patients per group) of 18 intra-articular interventions in knee and hip OA 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, triamcinolone had the highest probability of exceeding the minimal important difference at weeks 2 and 6; hyaluronic acid had NO effect on pain (SMD -0.04, 95% CrI -0.19 to 0.11) but higher odds of dropouts due to adverse events (OR 2.01) and of serious adverse events (OR 1.86) than placebo. Effects of 16 of the 18 interventions were smaller than the MID and most were consistent with placebo. da Costa BR, 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. 3. A BMJ meta-analysis of 169 trials (21,163 participants) found viscosupplementation (hyaluronic acid injection) reduced knee OA pain by SMD -0.08 (95% CI -0.15 to -0.02) in the 24 large placebo-controlled trials — about 2.0 mm on a 100 mm scale, far below the prespecified 0.37 SMD minimal clinically important difference — and increased serious adverse events (RR 1.49, 95% CI 1.12 to 1.98). Trial sequential analysis showed conclusive evidence of clinical equivalence to placebo has existed since 2009. Pereira TV, Juni P, Saadat P, et al. — [Viscosupplementation for knee osteoarthritis: systematic review and meta-analysis.](https://pubmed.ncbi.nlm.nih.gov/36333100/). *BMJ*, 2022. DOI: 10.1136/bmj-2022-069722. 4. The RESTORE trial randomized 288 adults aged 50+ with symptomatic mild-to-moderate medial knee OA to three weekly leukocyte-poor PRP injections or saline placebo. At 12 months, pain change was -2.1 vs -1.8 points (difference -0.4; 95% CI -0.9 to 0.2; P=.17) and medial tibial cartilage volume change was -1.4% vs -1.2% (P=.81). 29 of 31 prespecified secondary outcomes showed no significant between-group difference. The authors concluded the findings 'do not support use of PRP for the management of 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. 5. A safety review of intra-articular PRP in knee OA found significantly higher rates of mild knee pain and swelling than hyaluronic acid (p<0.001), driven specifically by leukocyte-RICH formulations; leukocyte-poor PRP showed a safety profile similar to HA. No severe adverse events were reported in any group. PM&R authors — [Assessment of adverse events and safety associated with intra-articular platelet-rich plasma injections compared with hyaluronic acid and saline in knee osteoarthritis.](https://pubmed.ncbi.nlm.nih.gov/42101047/). *PM&R*, 2026. DOI: 10.1002/pmrj.70141. 6. Medicare's national coverage policy states that CMS 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 knee osteoarthritis, 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. 7. FDA states verbatim: '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. 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. ## What are knee injections meant to do? Cortisone aims to calm swelling for a short time, while gel acts like joint fluid. PRP means platelet-rich plasma; the clinic takes an arm blood sample and spins it so the platelet-rich portion can go into the knee. For bone marrow concentrate, a needle draws liquid marrow from the pelvis and the clinic separates a smaller portion for the knee. These choices work differently, and none promises a set result. ## Why does my knee hurt more on some days? A longer walk, more stairs, a long sit, or a faster pace can stir the ache. Swelling and stiffness can also change from one day to the next. Write down what you did and check the soreness that evening. You’ll learn more from that note than from blaming the weather. ## How can I settle a sore knee at home? Do less of the activity that stirred it, but don’t become still. Easy leg work, a brace, or a cane may make moving easier. Skin medicine may also ease soreness. Ask the person who handles your medicines whether that medicine is safe for you. ## When does knee soreness need urgent care? Get quick help when fever arrives with a hot, red, swollen knee. New numbness or a foot turning cold or pale can’t wait either. Seek urgent care when an injured leg can’t take your weight. Fast swelling or severe soreness after a joint procedure isn’t an ordinary flare. ## How long can cortisone help my knee? Cortisone may help most during the first two to six weeks. In stronger studies, little benefit remained by about twelve weeks. A repeat every twelve weeks for two years led to more cartilage loss and no better soreness than salt water. Don’t accept a standing schedule without asking why another treatment is worth it. ## Is PRP worth considering for my knee? Some studies found better walking or stair use with PRP than with gel. The largest strong test found no better soreness relief than salt water at 12 months. Ask how much platelet material and how many white blood cells the clinic keeps. Also ask the full cost and when you’ll check the same daily task again. ## What if I have bone-on-bone joint wear? Severe wear may bring pain while resting, stiffness, or major trouble walking. A procedure may not help enough, so a surgical opinion can be sensible. Keep using safe home care while you collect your reports and questions. QC Kinetix offers regenerative treatments, its term for procedures that use one of your own body samples; after examining your knee, a medical provider—the person seeing you—can explain the non-surgical choices, but the term isn’t a promised result. ## Want someone to look at your knee? Take notes about the ache, your medicines, and earlier care. The clinician examining your knee can explain the choices and say when other care makes more sense. Schedule a free consultation: --- Straight talk about a sore knee. Straight answers about knee soreness, simple home care, danger signs, treatment choices, and nearby clinics. Plain help for understanding a sore knee and deciding what to ask next. This site is operated by the owners of the QC Kinetix Phoenix-area clinics, including the locations serving Glendale, and those owners benefit when readers book a consultation. © 2026 Glendale Knee Field Notes. General education only; it does not replace diagnosis or advice from a qualified medical professional.