Drainage versus nondrainage in total knee arthroplasty: a prospective randomized controlled trial

INTERVENTION: Drainage:Drain following TKA;Controll:Nondrainage following TKA; CONDITION: Knee osteoartritis;Rheumatoid arthritis PRIMARY OUTCOME: blood loss;Hidden blood loss;BMI;Blood loss intra‐operation;Volume of drainage;Volume of drainage;Volume of drainage;Blood transfusion volume;Blood transfusion cases;Hb;Hct;Superficial infection cases;Superficial hematoma;Dressing change;Ecchymosis;Tension vesicle;Length of hospital stay;Range of motion;HSS;Superficial temperature;VAS;Swelling;Deep venous thrombosis; INCLUSION CRITERIA: 1. Primary unilateral total knee artropasty; 2. Patients with Knee osteoartritis or Rheumatoid arthritis; 3. Able and willing to provide signed informed consent.