Ropivacaine Concentration and Rebound Pain

Inclusion Criteria: * Patients with distal radius fracture, scheduled for volar plate surgery * Surgery up to 20 days after fracture trauma * 18 to 80 years old (inclusive) * ASA 1, 2 or stable ASA 3 * Body Mass Index (BMI) 18 to 40 kg/m2 (inclusive) * Weight of 50 kg or more * Ability to communicate sufficiently in a scandinavian language * Capable of giving a signed informed consent * Ability and willingness to understand og be compliant to the study Exclusion Criteria: * Contemporaneous painful injuries * Existing long-term pain * Peripheral nerve damage in the arm with radius fracture * Patients who prior to fracture trauma use opioids, psycothropic drugs or medication, with or without prescription, with significantly sedative effect on regular basis. * Excessive use of alcohol (more than 15 units of alchol per week for men, more than 8 units of alchol per week for women, or patients reporting to be incapable of avoiding alcohol as long as they use strong opioids). * Progressive neurologic disease (inclusive diabetic neuropathy). * Skin infection at the site for brachial plexus nerve block * Other contraindications for brachial plexus nerve block * Contraindications for ropivacaine, paracetamol, etoricoxib, dexamehtasone or oxycodone * Previous allergic reaction to local anaesthetics or etoricoxib, dexamethasone, oxycodone or paracetamol. * Pregnant or breast-feeding women at surgery day (they do not get excluded if they become pregnant in the follow up period after in…