The purpose of this study is to compare the analgesic outcomes (time to first analgesic request, total amount of analgesic consumption, and pain scores) following total knee arthroplasty by either combined biceps femoris short head block and adductor canal block or genicular nerve block in elderly patients.
patient acceptance
Physical status: ASA I, II and Ⅲ.
Body mass index (BMI): 18.5 - 35 kg/m2.
Type of operations: total knee arthroplasty.
Known hypersensitivity to dexamethasone or bupivacaine.
Coagulation disorders or taking drugs affect surgical hemostasis.
Patients with pre-existing neurological deficits.
Uncooperative patient or with altered mental status.