# What does the evidence say about cartilage regrowth? *Knee Regeneration Scottsdale | What the Evidence Means* > Knee regeneration Scottsdale evidence on soreness relief, daily function, cartilage change, PRP, and sensible questions. ## What matters when the knee feels better? Some mornings bring less knee stiffness. You’ll walk farther or climb stairs with less soreness. Those changes matter to your day. They don’t prove that the smooth cartilage cover grew back. An X-ray shows the bones and joint space. It can’t show how sore you feel. ## Can relief happen without cartilage repair? A smooth cover called cartilage caps each bone end. It doesn’t have nerves that feel soreness. Nearby bone, tendons, muscles, and joint lining can hurt. Relief doesn’t require new cartilage. Better sleep or lighter activity can also change soreness. One good day won’t tell you enough. Pick a familiar walk or set of stairs. Check that same task over several weeks. You’ll see whether movement keeps getting easier. ## What does PRP mean for your knee? PRP means platelet-rich plasma: blood liquid with extra platelets, tiny pieces that form clots and carry healing signals. A machine spins a blood sample and separates this part. Clinics don’t all prepare PRP alike. In better-designed studies, some people received PRP. Others received plain salt water for a fair comparison. Salt water doesn’t contain PRP, and some results differed little. People also tell personal stories about feeling better. Those reports are anecdotal, meaning stories rather than proof. They can’t predict what you’ll feel. ## What should a treatment claim answer? Ask whether a claim means less soreness or new cartilage. Then ask how long the change lasted. Compare the knee wear, past surgery, and daily limits studied. QC Kinetix offers regenerative treatments made from your blood, fat, or marrow, the soft center inside bone. Licensed staff prepare the chosen part at the clinic. They can’t know your result in advance. Judge the result by tasks you know. Stairs may get easier, or walks may grow longer. A claim without a clear daily change isn’t enough. ## Sources 1. The RESTORE trial - a participant-, injector- and assessor-blinded RCT of 288 adults aged 50+ with symptomatic medial knee OA (Kellgren-Lawrence 2-3) - compared three weekly intra-articular PRP injections against saline placebo, with co-primary endpoints of 12-month knee pain and medial tibial cartilage volume on MRI. PRP did not beat placebo on either. It is the single best-designed test of the specific claim that PRP changes joint structure, and it was negative. Bennell KL, 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 four-arm, multicentre, single-blind phase 2/3 randomized trial of 480 knee OA patients (KL II-IV) compared autologous bone marrow aspirate concentrate, autologous adipose stromal vascular fraction and allogeneic umbilical-cord-tissue mesenchymal stromal cells against a corticosteroid injection control. At 12 months NONE of the three orthobiologic injections was superior to another, or to the corticosteroid control, and none of the four groups showed a significant change in MRI osteoarthritis score from baseline. No procedure-related serious adverse events occurred. 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. 3. A 2026 systematic review and meta-analysis of 28 randomized trials of intra-articular mesenchymal stem cell-based therapies in knee OA found significant improvements in several pain and function measures (delta-VAS MD -1.67; KOOS pain MD 15.37) but NO significant difference in WOMAC, KOOS quality of life or the Lequesne index, and MRI-based WORMS scores were non-significant - indicating no consistent structural benefit. Its own conclusion: these therapies serve a primarily SYMPTOM-modifying rather than STRUCTURE-modifying role, with higher frequencies of local reactions to weigh against the symptomatic benefit. Awad G, et al. — [Efficacy and safety of intra-articular mesenchymal stem cell-based therapies in knee osteoarthritis: A systematic review and meta-analysis of randomized controlled trials.](https://pubmed.ncbi.nlm.nih.gov/41863718/). *Clinical rheumatology*, 2026. DOI: 10.1007/s10067-026-08042-w. 4. FORWARD, the longest disease-modifying osteoarthritis drug trial reported to date, gave intra-articular sprifermin (a recombinant FGF-18) or placebo to knee OA patients and followed 378 of them for 5 years. Sprifermin produced a significant, sustained dose-response INCREASE in total femorotibial cartilage thickness versus placebo - and WOMAC pain improved about 50% from baseline in ALL groups, including placebo. It is the cleanest demonstration in the literature that adding measurable cartilage and relieving pain are two different results, and that one does not deliver the other. Eckstein F, et al. — [Long-term structural and symptomatic effects of intra-articular sprifermin in patients with knee osteoarthritis: 5-year results from the FORWARD study.](https://pubmed.ncbi.nlm.nih.gov/33962962/). *Annals of the rheumatic diseases*, 2021. DOI: 10.1136/annrheumdis-2020-219181. 5. A systematic review of the discordance between clinical and radiographic knee osteoarthritis: many people with severe-looking x-rays have little pain, and many with disabling pain have modest radiographic change. This is the reason a post-treatment scan is a poor proxy for how someone feels, in either direction. Bedson J, et al. — [The discordance between clinical and radiographic knee osteoarthritis: a systematic search and summary of the literature.](https://pubmed.ncbi.nlm.nih.gov/18764949/). *BMC musculoskeletal disorders*, 2008. DOI: 10.1186/1471-2474-9-116. ## What can you bring to the visit? Licensed clinic staff start by listening to you. They’ll examine your knee and review earlier care. Then they’ll explain which choices may fit. Write down every medicine you take. Keep earlier images or reports handy. Call (602) 837-PAIN if you need visit details. Schedule a free consultation: --- Knee soreness, home care, and treatment choices. Clear answers on knee aches, home steps, warning signs, and treatment choices in Scottsdale. Plain Scottsdale guidance for knee soreness, daily movement, warning signs, and treatment choices. This Scottsdale education website is operated by the owners of the QC Kinetix Phoenix-area clinics, who may benefit when local readers schedule a visit. © 2026 The Scottsdale Cartilage Atlas. General health education cannot replace an examination or advice tailored to your knee.