**5.5 Number of drainages**

The study by Labek et al. (Labek & Bohler, 1998) links the number of drainages with prosthetic hip bleeding. Their article studies the relationship between number of drainages, its positioning (deep and/or superficial) and its relationship with transfusions needed, wound's exudation, subcutaneous hematoma and thigh edema. Given the possibility of placing three drainages, two drainages, (subcutaneously and subfascial) or one drainage (subcutaneously or subfascial), the conclusion was that using two drainages alone is better rather than 3 drainages or no drainage as there are no more complications with respect to surgical injury and a 47% reduction of blood units was achieved.
