Comparison of continuous femoral nerve block (CFNB/SA) and continuous femoral nerve block with mini-dose spinal morphine (CFNB/SAMO) for postoperative analgesia after total knee arthroplasty (TKA): a randomized controlled study

比较持续股神经阻滞（CFNB/SA）与持续股神经阻滞联合小剂量脊髓吗啡（CFNB/SAMO）用于全膝关节置换术（TKA）术后镇痛的效果：一项随机对照研究