Combination of magnesium sulphate and ropivacaine epidural analgesia for hip arthroplasty in dogs

The addition of epidural magnesium to ropivacaine did not improve or prolong the analgesia provided by ropivacaine alone. Further studies are needed to determine whether an epidural magnesium dose of >2 mg kg−1 would exert better analgesia, without causing adverse effects, in dogs undergoing orthopaedic surgery.