Study the Anti-inflammatory Effect of Tranexamic Acid When Used in Anterior Cruciate Ligament Reconstruction.

Tranexamic acid (TXA) is widely used in orthopedic surgery to reduce perioperative blood loss, particularly in total hip and knee arthroplasty, due to its antifibrinolytic mechanism, low cost, broad availability, and established safety profile. Its use has recently expanded to minimally invasive procedures such as knee arthroscopy and ACL reconstruction, where postoperative hemarthrosis-rather than intraoperative bleeding-is a major cause of pain, swelling, reduced range of motion, delayed rehabilitation, and impaired early recovery. Randomized trials and meta-analyses in arthroscopic ACL reconstruction show that TXA, administered intravenously, intra-articularly, or both, reduces postoperative hemarthrosis, joint swelling, drainage volume, and early pain, while improving early functional outcomes. These benefits are mainly short term, with no consistent long-term differences, and no increased risk of thromboembolic events. Evidence in arthroscopic meniscectomy is more limited but suggests modest improvements in early recovery, which may still be clinically meaningful given TXA's favorable risk-benefit profile. Beyond its antifibrinolytic effects, TXA may influence inflammatory pathways by inhibiting plasmin, which is involved in complement activation and inflammatory modulation. However, existing data are conflicting, with reports of both anti- and pro-inflammatory effects depending on surgical context and dosing. Importantly, most arthroscopy studies focus on clinical outcomes rather than systemic inflammation. To date, no study has comprehensively evaluated perioperative inflammatory responses to TXA in arthroscopic knee surgery, making this low-trauma setting an ideal model to investigate its potential inflammatory effects.