Effect of extracorporeal shock wave therapy on the biochemical composition and metabolic activity of tenocytes in normal tendinous structures in ponies.
Authors: Bosch G, Lin Y L, van Schie H T M, van De Lest C H A, Barneveld A, van Weeren P R
Journal: Equine veterinary journal
Summary
# Editorial Summary: Extracorporeal Shock Wave Therapy and Tendon Metabolism in Ponies Bosch and colleagues investigated the mechanisms underlying extracorporeal shock wave therapy (ESWT) by exposing healthy tendons and ligaments in six Shetland ponies to treatment and examining biochemical and cellular responses at two timepoints: 3 hours and 6 weeks post-treatment. Using in vitro tendon explant cultures and biochemical analysis, they measured glycosaminoglycan (GAG) and protein synthesis, collagen degradation, and DNA content in treated and contralateral control limbs. The short-term response (3 hours) proved encouraging, with significantly elevated GAG and protein synthesis alongside increased degraded collagen, suggesting ESWT stimulates cellular metabolic activity in the immediate post-treatment window. However, by 6 weeks the picture shifted markedly: synthesis of all measured parameters declined below baseline, and GAG and degraded collagen contents both decreased compared to untreated controls, indicating a substantial suppression of tenocyte metabolism. These findings carry important clinical implications—the brief stimulatory phase might theoretically benefit early tendon healing by promoting initial tissue response, yet the prolonged metabolic depression raises concerns about long-term tissue quality and suggests ESWT's therapeutic window may be narrower than previously assumed, warranting caution in how clinicians time and apply this modality in practice.
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Practical Takeaways
- •ESWT produces a brief metabolic stimulation window (3 hours) that may help initiate healing in injured tendons, but effects are transient
- •Long-term effects at 6 weeks show suppressed metabolism and lower glycosaminoglycan content than untreated tendons, suggesting limited sustained benefit or potential tissue fatigue
- •Treatment timing matters: short-term effects may be beneficial for acute injuries, but the clinical relevance of longer-term suppression requires further investigation before recommending ESWT as standard therapy
Key Findings
- •ESWT increased glycosaminoglycan and protein synthesis at 3 hours post-treatment (P<0.05)
- •Degraded collagen levels increased 3 hours after ESWT (P<0.05)
- •By 6 weeks post-treatment, synthesis of all measured parameters was significantly decreased compared to baseline
- •DNA content remained unchanged in both treated and control tendon samples, indicating no cellular proliferation response