The trial aims to evaulate the possiblity that use of virtual reality spectacles will affect post operative pain in total knee arthroplasty patients. The trial is a single center open label design. Patients will be randomized into two arm study comparing the effect of the use of virtual reality spectacles on pain levels and analgesic consumption in the perioperative period. The controls shall receive standard post operative care. The endpoints are VAS levels and analgesic use.