A study to compare between 2 pain relief blocks after total knee arthroplasty surgery.

Patients are randomly assigned to receive either adductor canal block (group A, interventional) or femoral nerve block (group B, comparator) after total knee arthroplasty as a part of post operative analgesia. An ultrasound guided single shot adductor canal block will be done after the surgery is completed and sterile dressing is applied. The block in this group will be done with 20 mls of 0.25% Bupivacaine. One dedicated consultant anaesthetist will be assigned to this group to perform the block to avoid inter individual block performance bias. A pain nurse followed up the patient in recovery and in ward and collected patient data, who was blinded to the study group to which the patient is assigned. Patient Control Analgesia was prescribed for all patients with morphine and it will be prepared as an intravenous infusion with morphine 30mg taken in 12 ml Normal Saline, diluted to 2 mg/ml concentration. Analgesia will be self administered by patient using a automatic pump with each bolus dose administered delivering 1 mg per bolus dose with 5 minutes lockout interval and 30 mg maximum dose in 4 hours for 24 hours. Patient will receive multimodal analgesia for pain control after the surgery with paracetamol 1 g four times a day. Both groups will receive same protocol to avoid bias. Early mobilisation and patient satisfaction data were collected.