A new Johns Hopkins University study has found that poor preoperative sleep is associated with greater pain and poor functional outcomes as long as twelve months after total knee replacement. Postoperative sleep has been well-studied, but the Johns Hopkins team was interested in the earlier sleep relationship. To help determine the effect between preoperative sleep quality and postoperative pain, researchers enrolled 164 total knee replacement patients into the trial. Participants completed a battery of questionnaires and assessment procedures before surgery and six weeks and three, six and twelve months postoperatively. The Johns Hopkins team found that shorter preoperative sleep duration was significantly associated with increased average pain severity three months after surgery, even after controlling for age, baseline depression and pain scores. Preoperative sleep duration did not predict pain at six months after surgery, but was marginally associated with pain at twelve months. Shorter sleep duration six weeks after surgery also significantly predicted greater pain at three, six and twelve months after surgery.
Read further analysis via Pain Medicine News here.