Our hypothesis is that an addition of oral 1000 mg magnesium citrate daily for 7 Days starting at the day of the surgery will decrease the postoperative pain and improve the recovery after surgery. It will be given as an supplement to the regular pain treatment with acetaminophen and oxycodone that are used in our hospital and compared to a placebo. The choice of treatment will be blinded for the patient, the care providers and for the research team doing the evaluation.~The pain level will be collected Before surgery, postoperatively and at 14 Days after surgery and by a self reporting form during the first 7 Days. The patients will also report their recovery with a modified QoR-15 form. QoR-15 is validated in a Swedish version.~Magnesium is shown to reduce postoperative pain in some studies that used iv magnesium sulphate. For long lasting pain conditions oral magnesium is shown to improve the patients well being and decrease their pain in some conditions. Magnesium acts as a mild antagonist at the NMDA-receptor. Thus low levels of magnesium is thought to increase the risk of long lasting postoperative pain. Therefore there are reason to expect a higher dose of magnesium supplement decreases the long lasting post operative pain.
A randomised controlled trial of addition to the standard pain treatment of 1000 mg oral magnesium citrate or placebo for 7 Days during surgery for thumb base arthrosis. Intraoperative nociception will be measured with the NoL-index with a PM-200 machine.