“…To fill this knowledge gap, a research group from New York (New York, USA) conducted a retrospective analysis on a cohort of 104 patients undergoing hip or knee arthroplasty to establish where the patients are with sleep disturbance. 3 The authors deployed the PROMIS Sleep Disturbance questionnaire to assess sleep patterns at multiple timepoints: preoperatively, at two and six weeks, and at three months postoperatively. Interestingly, the study revealed that more than half of the patients (55%) had sleep disturbance within normal limits before the surgery.…”