**Blood Transfusion in Knee Arthroplasty**

Oscar Ares1, Montserrat Tio2, Juan Carlos Martinez Pastor1, Luis Lozano1,

Josep Maria Segur1, Francisco Macule1 and Santiago Suso1,3 *1Orthopedic Department, Knee Unit, Hospital Clinic Barcelona 2Anesthesioly Department, Hospital Clinic Barcelona 3ICEMEQ Institut Spain* 
