V dveh velikih, randomiziranih, dvojno slepih preskušanjih za potrditev odmerka z vzporednima skupinama so bolniki po večji ortopedski operaciji (v prvem preskušanju po vstavitvi umetnega kolena in v drugem umetnega kolka) prejeli zdravilo Pradaxa po 75 mg ali 110 mg 1 do 4 ure po posegu in nato 150 mg ali 220 mg na dan ob zagotovljeni hemostazi, ali enoksaparin po 40 mg dan pred operacijo in nato vsak dan po njej.
In 2 large randomized, parallel group, double-blind, dose– confirmatory trials, patients undergoing elective major orthopaedic surgery (one for knee replacement surgery and one for hip replacement surgery) received Pradaxa 75 mg or 110 mg within 1-4 hours of surgery followed by 150 mg or 220 mg daily thereafter, haemostasis having been secured, or enoxaparin 40 mg on the day prior to surgery and daily thereafter.