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Summary
This summary is machine-generated.

Tranexamic acid (TXA) combined with hyaluronic acid (HA) significantly protects against oxidative degradation, preserving joint viscoelasticity. This HA-TXA formulation offers superior stability compared to other HA viscosupplements.

Keywords:
hyaluronic acidosteoarthritisoxidative stressrheologytranexamic acidviscosupplementation

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Area of Science:

  • Biomaterials Science
  • Rheology
  • Osteoarthritis Research

Background:

  • Intra-articular hyaluronic acid (HA) efficacy in osteoarthritis is limited by oxidative degradation in inflamed joints.
  • Reactive oxygen species cause HA chain scission, altering viscoelastic properties and reducing therapeutic effectiveness.
  • Tranexamic acid (TXA), known for anti-inflammatory and anti-proteolytic effects, is hypothesized to mitigate HA degradation.

Purpose of the Study:

  • To evaluate if an HA-TXA formulation maintains viscoelastic integrity under oxidative stress.
  • To compare the stability of HA-TXA against linear, hybrid, and cross-linked HA viscosupplements.

Main Methods:

  • Four HA-based formulations were analyzed using stress-controlled rotational rheometry (ISO 3219).
  • Rheological parameters (complex modulus, complex viscosity, phase angle) were measured before and after induced oxidative stress (5.4% H2O2).
  • Resistance to degradation was quantified by changes in rheological parameters post-oxidation.

Main Results:

  • The HA-TXA formulation exhibited minimal loss in complex viscosity (-17.0%) and phase angle (+4.0%) after oxidative challenge.
  • HA-TXA stability surpassed that of linear HA (-53%; +25.6%) and hybrid HA (-40%; +12.6%).
  • The HA-TXA formulation's stability approached that of cross-linked HA (-25.4%; +5.6%), with minimal microstructural changes.

Conclusions:

  • Combining TXA with HA provides significant protection against oxidative degradation, preserving viscoelasticity and network integrity.
  • TXA enhances HA stability through mechanisms independent of chemical cross-linking.
  • The findings support HA-TXA as a promising viscosupplement for osteoarthritis, offering improved resistance to joint oxidative stress.