Abstract:[Objective] To explore the effect of hydrogen -oxygen mixture inhalation on early consequences of arthroscopic repair of ro-tator cuff tear. [Methods] A retrospective study was performed on 60 patients who underwent unilateral arthroscopic rotator cuff repair fromFebruary 2020 to October 2021. According to the preoperative doctor-patient communication, 30 patients were inhaled hydrogen and oxy-gen mixture (the HOM group), while other 30 patients were inhaled pure oxygen (the PO group). The clinical and blood test data of the twogroups were compared. [Results] All patients were operated on successfully, without significant differences in the operation time, mean arte-rial pressure and heart rate 30min after intubation between the two groups (P>0.05). As all patients were followed up for 12-weeks, theVAS score for pain, Constant-Murley and UCLA scores in both groups were significantly improved over time (P<0.05). Although there wasno statistical significance in the above scores between the two groups before surgery (P>0.05), the HOM group proved significantly superiorto the PO group 12 weeks after surgery in terms of VAS score [(1.7±0.6) vs (2.2±0.7), P<0.05], UCLA [(29.1±0.8) vs (28.3±1.5), P<0.05] andConstant-Murley score [(93.7±2.1) vs (91.4±3.9), P<0.05]. Regarding blood test, the levels of serum IL-6 and TNF-a in both groups weresignificantly decreased after surgery (P<0.05). The HOM group was significantly lower than the PO group in terms of IL-6 [(1.5±0.8) pg/mlvs (2.2±0.3) pg/ml, P=0.040] and TNF-alpha [(2.0±0.9) pg/ml vs (2.6± 0.9) pg/ml, P=0.026] 12 weeks postoperatively. [Conclusion] Inhala-tion of hydrogen and oxygen mixture does relieve pain and improve function after arthroscopic repair of rotator cuff tear.