Analgesic efficacy of adductor canal block with different volume of ropivacaine in patient after ar- throscopic knee surgery

Abstract

Objective To compare the analgesic efficacy of different volume of 0.375% ropivacaine in patient after arthroscopic knee surgery. Methods Sixty patients for selective arthroscopic knee surgery were randomly assigned into two groups, 30 patients in each. Patients in group A received 0.375%ropivacaine 20 ml, while in group B received 35 ml. The adductor canal block was given after the combined spinal-epidur- al anesthesia. Visual analogue scales (VAS) at rest and movement and quadriceps muscle strength was record- ed in postoperative 2, 4, 6, 24 and 48 h. Side effects and additional analgesic doses were recorded. Results There was no significant difference in VAS between the two groups at all time points postoperatively (P>0.05). The quadriceps muscle strength grading in group A was higher than that in group B at all time points (P 0.05). No supplement analgesic was used and the adverse reactions between the both groups had no significant difference. Conclusion The efficacy of analgesia has no statistical differ- ence by adductor canal block with two different volumes of 0.375%ropivacaine, but the quadriceps muscle strength with 20 ml ropivacaine is preserved better than that with 35 ml after arthroscopic knee surgery. Key words: Adductor canal; Nerve block; Amides; Analgesia; Arthroscopy