We hypothesize continuous adductor canal block with steroid adjuvant would offer no inferior analgesics and rehabilitation ability than continuous femoral nerve block for postoperative patients receiving total knee arthroplasty.
A total of 80 patients who will undergo total knee arthroplasty will be randomized into two groups: Treatment groups Treatment details Femoral Group (40 patients) Continuous femoral nerve block (bolus: 0.5% Ropivacaine 10-15 ml ; infusion of 0.15 % Ropivacaine 4-6ml/h) Adductor Group (40 patients) Adductor canal block with steroid adjuvant (bolus: 0.5% Ropivacaine 10-15ml; Dexamethasone 4mg) (Total 80 patients will be recruited) * All patients will receive single shot tibial nerve block with local anaesthetics (0.5% Ropivacaine 5-8ml) before surgery for analgesia of posterior knee. * All patients will receive the same preemptive and postoperative multimodal medications for perioperative analgesia. * All groups will receive standardized method of spinal anaesthesia and standardized method of intraoperative sedation for the surgery. * Intravenous patient controlled analgesia (PCA) with morphine will be given for 48h to patient as rescue analgesia.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
TREATMENT
Masking
SINGLE
Enrollment
80
Continuous adductor canal block and single shot posterior tibial nerve block under ultrasound guidance and using nerve stimulating needle (bolus: 0.5% Ropivacaine 10-15ml with dexamethasone 4mg ;with single shot posterior tibial nerve block (8-10ml 0.5% ropivacaine)
Femoral nerve catheter inserted under ultrasound guidance using nerve stimulating needle administering ropivacaine bolus 10-15ml and infusing 0.2% ropivacaine at 4-6ml/h; plus a single shot posterior tibial nerve block under ultrasound guidance and use of nerve stimulating needle
Joint Replacement Center, Buddhist Hospital
Kowloon, Hong Kong
PCA morphine or pain rescuer consumption at 24h and 48h postoperative
Time frame: 24h and 48h postoperative
Postoperative pain score (visual analogue scale 0-10) at 6h,12h, 24h,48h, 72h after surgery
Time frame: 6h,12h, 24h,48h, 72h after surgery
Quadriceps strength at 24h, 48h, 72h postoperative
using dynamometer (measure in Newton/centimeter square)
Time frame: 24h, 48h, 72h postoperative
Patient satisfaction score (0-4)
Time frame: upon discharge
Incidence of side effects and complications at postoperative day 0- 4 postoperative
Time frame: postoperative period 0-96 hr postoperative
Length of Stay in hospital 6. Length of Stay in hospital length of hospital stay
Time frame: upon discharge
postoperative nausea or vomiting
Time frame: 0-72h
postoperative pruritis
Time frame: 0-72h
Haemastix on call and every 8 hours after surgery for postoperative 24hours for patients
Time frame: on call and every 8 hours after surgery for postoperative 24h
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