Trial reportScientific reports2021
Platelet-rich plasma (PRP) in osteoarthritis (OA) knee: Correct dose critical for long term clinical efficacy.
Trial report in Scientific reports, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. An erratum has been issued. Cited by 101 papers, 10 of them syntheses that pooled it.
What it found
Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.
The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.
Who cites it
101 citing papers in PubMed, 10 syntheses or guidelines pooled it, 162 citations in OpenAlex.
- Autologous platelet-rich plasma versus hyaluronic acid, corticosteroids or saline for knee osteoarthritis: can blood draw volume serve as a proxy for platelet dose? A systematic review and meta-analysis.International orthopaedics · 2026Pooled it
- The potential of platelet-rich plasma and PRP-derived biologics for neurological disorders: mechanisms and translational research.Frontiers in immunology · 2026Pooled it
- [Efficacy of Intra-Articular Platelet-Rich Plasma in Knee Osteoarthritis: a Systematic Review and Meta-Analysis].Acta chirurgiae orthopaedicae et traumatologiae Cechoslovaca · 2025Pooled it
- The efficacy of platelet-rich plasma preparation protocols in the treatment of osteoarthritis: a network meta-analysis of randomized controlled trials.Journal of orthopaedic surgery and research · 2025Pooled it
- Efficacy and safety of biological products in hip osteoarthritis: a systematic review and meta-analysis of randomized controlled trials.Clinical rheumatology · 2025Pooled it
- Long-term effectiveness of intra-articular injectables in patients with knee osteoarthritis: a systematic review and Bayesian network meta-analysis.Journal of orthopaedic surgery and research · 2025Pooled it
- Efficacy of ultrasound-guided intra-articular injection in the treatment of knee osteoarthritis in early and middle stages: a network meta-analysis.Frontiers in medicine · 2025Pooled it
- Platelet lysate for the treatment of osteoarthritis: a systematic review of preclinical and clinical studies.Musculoskeletal surgery · 2024Pooled it
- The Influence of Industry Affiliation on Randomized Controlled Trials of Platelet-Rich Plasma for Knee Osteoarthritis.The American journal of sports medicine · 2023Pooled it
- Mesenchymal stem cells and platelet rich plasma therapy for knee osteoarthritis: an umbrella review of systematic reviews with meta-analysis.Annals of Saudi medicinePooled it
- Cell-Free Blood Cell Secretome (BCS) Counteracts Skin Aging: Multi-Center Prospective Regenerative Aesthetic Medicine Study Using Exokine®.Clinical, cosmetic and investigational dermatology · 2022Trial
- Controlled Release of the IL-1R Antagonist, Anakinra, from Microgels with an Extended Intra-articular Residence Time.Pharmaceutical research · 2026Article
- The Effect of Intraarticular Platelet-Rich Plasma Injection in Knee Osteoarthritis.Journal of orthopaedic case reports · 2026Article
- Osteoarthritis: Epidemiology, Diagnosis, and Treatment.MedComm · 2026Review
- Short-Term Clinical Outcomes and Systemic Inflammatory Biomarker Responses Following Platelet-Rich Plasma Injection in Knee Osteoarthritis.Life (Basel, Switzerland) · 2026Article
- Ultrasound-guided long-term platelet-rich plasma injections for moderate-to-severe knee osteoarthritis: a case report.Journal of medical case reports · 2026Article
- Article
- Immune Cell Composition and Protein Biomarkers Correlate With PRP Treatment Outcomes in Knee Osteoarthritis.Orthopaedic journal of sports medicine · 2026Article
- Influence of platelet-rich plasma composition on pain and functional performance in knee osteoarthritis: a systematic review and network meta-analysis.Knee surgery & related research · 2026Review
- How to extract leucocyte-poor platelet-rich plasma using a commercial platelet concentration system developed to obtain leucocyte-rich platelet-rich plasma: A pilot study.Journal of experimental orthopaedics · 2026Article
41 more citing papers are in PubMed but not listed here.
Corrections and comments
- Erratum issued
Authors and funding
7 authors at 4 institutions in 4 countries.
Funding
No grant is acknowledged in the PubMed record.
Abstract
Despite encouraging results reported with regards to Platelet-rich plasma (PRP) application in osteoarthritis (OA) knee, still critical issues like conclusive structural evidence of its efficacy, standard dose and good manual method of preparation to obtain high yield remains unanswered. Present study is an attempt to optimise the dose and concentration of therapeutic PRP and its correlation with structural, physiologic efficacy with a new manual method of PRP preparation. A total of one hundred and fifty patients were randomized to receive either PRP (10 billion platelets) or hyaluronic acid (HA; 4 ml; 75 patients in each group) and followed up till 1 year. An addition of filtration step with 1 µm filter in manual PRP processing improved platelet recovery upto 90%. Significant improvements in WOMAC (51.94 ± 7.35 vs. 57.33 ± 8.92; P < 0.001), IKDC scores (62.8 ± 6.24 vs 52.7 ± 6.39; P < 0.001), 6-min pain free walking distance (+ 120 vs. + 4; P < 0.001) persisted in PRP compared to HA group at 1 year. Significant decline IL-6 and TNF-α levels observed in PRP group (P < 0.05) compared to HA at 1 month. Study demonstrated that an absolute count of 10 billion platelets is crucial in a PRP formulation to have long sustained chondroprotective effect upto one year in moderate knee OA.
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Registered trials
Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.