The time-effect relationship of intra-articular ozone injection for knee osteoarthritis: a systematic review and meta-analysis - Report - MDSpire

The time-effect relationship of intra-articular ozone injection for knee osteoarthritis: a systematic review and meta-analysis

  • By

  • Fengjiao Chen

  • Yufeng Tao

  • Jing Deng

  • Leyi Zhang

  • Lanlan Yu

  • Zhuoxi Yang

  • Yixuan Zhang

  • Chi Zhang

  • June 17, 2026

  • 0 min

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Clinical Report: Temporal Effects of Intra-Articular Ozone Therapy on Knee Osteoarthritis

Overview

This systematic review and meta-analysis evaluated the temporal efficacy of intra-articular ozone therapy in patients with knee osteoarthritis (KOA). Results indicate significant short-term symptom improvement, particularly at 1-2 months, but diminishing effects by 3 months and inferior outcomes compared to active controls at 6-12 months.

Background

Knee osteoarthritis (KOA) is a prevalent degenerative joint disease that significantly impacts patients' quality of life and healthcare systems. Intra-articular injection therapies, including ozone therapy, are increasingly utilized for symptom relief. Understanding the duration of therapeutic effects is crucial for effective long-term management strategies.

Data Highlights

OutcomeTime PointSMD (95% CI)P-value
WOMAC Total1 month-0.63 (-1.17, -0.10)<0.01
WOMAC Pain2 months-1.39 (-1.96, -0.81)<0.01
WOMAC Function2 months-1.27 (-2.06, -0.49)<0.01
VAS Pain2 months-1.25 (-2.10, -0.40)<0.01

Key Findings

  • Intra-articular ozone therapy shows significant symptom improvement in KOA at 1-2 months.
  • By 3 months, no statistically significant differences were observed in outcomes.
  • At 6 and 12 months, ozone therapy demonstrated inferior outcomes compared to active control therapies.
  • Ozone therapy may serve as a short-term treatment option for KOA.
  • Further placebo-controlled long-term trials are needed to assess the efficacy of repeated ozone injections.

Clinical Implications

Clinicians should consider intra-articular ozone therapy as a potential short-term treatment for KOA, particularly for immediate symptom relief. However, the diminishing effects over time and inferior outcomes compared to established therapies necessitate careful patient selection and consideration of alternative long-term management strategies.

Conclusion

Intra-articular ozone therapy can provide short-term relief for KOA symptoms, but its long-term efficacy is limited. Further research is essential to establish its role in comprehensive treatment plans.

Related Resources & Content

  1. Frontiers in Medicine, 2026 -- Effectiveness and safety of probiotics in treating knee osteoarthritis: an updated systematic review and meta-analysis of randomized controlled trials
  2. Knee Surgery, Sports Traumatology, Arthroscopy, 2019 -- Impact of Distinct Characteristics of Intra-Articular Injections on Outcomes in Knee Osteoarthritis: A Network Meta-Analysis
  3. Clinical Rheumatology, 2024 -- Targeting Inflammation in Osteoarthritis: A Review of Clinical Trial Findings
  4. Knee Surgery, Sports Traumatology, Arthroscopy, 2020 -- Intra-articular Administration of Bone Marrow-Derived Mesenchymal Stem Cells Promotes Healing in Knee Osteoarthritis
  5. Recommendations Management | EULAR, 2023 -- EULAR recommendations for the management of knee osteoarthritis
  6. 21 CFR § 801.415 - Maximum acceptable level of ozone. | Electronic Code of Federal Regulations (e-CFR) | US Law | LII / Legal Information Institute
  7. Frontiers, 2026 -- The time-effect relationship of intra-articular ozone injection for knee osteoarthritis: A systematic review and meta-analysis
  8. EULAR Recommendations Management
  9. FDA Regulation on Ozone
  10. Frontiers | The time-effect relationship of intra-articular ozone injection for knee osteoarthritis:A systematic review and meta-analysis
  11. Intra-articular injections of oxygen-ozone versus hyaluronic acid for the treatment of knee osteoarthritis: A randomized controlled trial - Cristiano Sconza, Andrea Parente, Nicola Marotta, Giacomo Farì, Dalila Scaturro, Michele Vecchio, Giulia Letizia Mauro, Antonio Ammendolia, Alessio Baricich, Alessandro de Sire, 2026
  12. Efficacy of ultrasound-guided intra-articular injection in the treatment of knee osteoarthritis in early and middle stages: a network meta-analysis

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