SynthesisPain medicine (Malden, Mass.)2019
Meta-analysis Comparing Platelet-Rich Plasma vs Hyaluronic Acid Injection in Patients with Knee Osteoarthritis.
Synthesis in Pain medicine (Malden, Mass.), 2019. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 57 papers, 12 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
57 citing papers in PubMed, 12 syntheses or guidelines pooled it, 132 citations in OpenAlex.
- Assessment of adverse events and safety associated with intra-articular platelet-rich plasma injections compared to other injectates for knee osteoarthritis: A systematic review and meta-analysis.PM & R : the journal of injury, function, and rehabilitation · 2026Pooled it
- Intra-articular injections of hyaluronic acid versus plasma rich in growth factors (PRGF) for knee osteoarthritis: a meta-analysis of randomised controlled trials : A meta-analysis.Orthopadie (Heidelberg, Germany) · 2025Pooled it
- Platelet rich plasma injections for knee osteoarthritis: an overview of systematic reviews.Frontiers in physiology · 2025Pooled it
- Efficacy and safety of platelet-rich plasma and hyaluronic acid combination therapy for knee osteoarthritis: a systematic review and meta-analysis.Archives of orthopaedic and trauma surgery · 2024Pooled it
- The use of platelet-rich plasma in studies with early knee osteoarthritis versus advanced stages of the disease: a systematic review and meta-analysis of 31 randomized clinical trials.Archives of orthopaedic and trauma surgery · 2023Pooled it
- Systematic Review and Network Meta-analysis of Acupuncture Combined with Massage in Treating Knee Osteoarthritis.BioMed research international · 2022Pooled it
- PRP Injections for the Treatment of Knee Osteoarthritis: A Meta-Analysis of Randomized Controlled Trials.Cartilage · 2021Pooled it
- Intra-articular injections of platelet-rich plasma in symptomatic knee osteoarthritis: a consensus statement from French-speaking experts.Knee surgery, sports traumatology, arthroscopy : official journal of the ESSKA · 2021Pooled it
- The effects of platelet-rich plasma injection in knee and hip osteoarthritis: a meta-analysis of randomized controlled trials.Clinical rheumatology · 2021Pooled it
- Platelet-rich plasma versus hyaluronic acid in the treatment of knee osteoarthritis: a meta-analysis.Journal of orthopaedic surgery and research · 2020Pooled it
- Effects and safety of the combination of platelet-rich plasma (PRP) and hyaluronic acid (HA) in the treatment of knee osteoarthritis: a systematic review and meta-analysis.BMC musculoskeletal disorders · 2020Pooled it
- How to Choose Platelet-Rich Plasma or Hyaluronic Acid for the Treatment of Knee Osteoarthritis in Overweight or Obese Patients: A Meta-Analysis.Pain research & management · 2020Pooled it
- Comparing the Efficacy of Intra-Articular Single Platelet-Rich Plasma(PRP) versus Novel Crosslinked Hyaluronic Acid for Early-Stage Knee Osteoarthritis: A Prospective, Double-Blind, Randomized Controlled Trial.Medicina (Kaunas, Lithuania) · 2022Trial
- [Prospective clinical study on extracorporeal shock wave therapy combined with platelet-rich plasma injection for knee osteoarthritis].Zhongguo xiu fu chong jian wai ke za zhi = Zhongguo xiufu chongjian waike zazhi = Chinese journal of reparative and reconstructive surgery · 2019Trial
- Comparative efficacy of ultrasound-guided intra-articular injection of platelet-rich plasma (PRP), hydrolyzed type I collagen, and hyaluronic acid in patients with knee osteoarthritis: a randomized controlled trial.Future science OA · 2026Article
- Review
- Current State of Orthobiologics in Treatment of Knee Osteoarthritis-Future Directions.International journal of molecular sciences · 2026Review
- Interventional Effects of Small Needle-Knife Combined with Exercise Therapy in the Treatment of Knee Osteoarthritis: A Systematic Review and Meta-Analysis.Journal of pain research · 2026Review
- The effect of multi-disciplinary treatment on surgical outcomes and kinematic gait patterns in patients undergoing primary unilateral knee unicompartmental arthroplasty: a retrospective cohort study.Frontiers in nutrition · 2026Article
- Shocking Results of Platelet-Rich Plasma Administration Concurrent With Autologous Chondrocyte Implantation Negatively Impacting Cartilage Repair: Response.Orthopaedic journal of sports medicine · 2025Article
Corrections and comments
PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.
Authors and funding
8 authors at 2 institutions in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
purposeThe purpose of this meta-analysis was to compare platelet-rich plasma (PRP) and hyaluronic acid (HA) in patients with knee osteoarthritis (KOA).
methodsRandomized controlled trials (RCTs) comparing the use of PRP and HA in KOA patients were retrieved from each database from the establishment date to April 2018. Outcome measurements were the Western Ontario and McMaster Universities Arthritis Index (WOMAC), visual analog scale (VAS), International Knee Documentation Committee, and Lequesne Index scores and adverse events. The pooled data were evaluated with Review Manager 5.3.5.
resultsFifteen RCTs (N = 1,314) were included in our meta-analysis. The present meta-analysis indicated that PRP injections reduced pain more effectively than HA injections in patients with KOA at six and 12 months of follow-up, as evaluated by the WOMAC pain score; the VAS pain score showed a significant difference at 12 months. Moreover, better functional improvement was observed in the PRP group, as demonstrated by the WOMAC function score at three, six, and 12 months. Additionally, PRP injections did not display different adverse event rates compared with HA injections.
conclusionIn terms of long-term pain relief and functional improvement, PRP injections might be more effective than HA injections as a treatment for KOA. The optimal dosage, the timing interval and frequency of injections, and the ideal treatment for different stages of KOA remain areas of concern for future investigations.
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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.