Total blood loss in total hip resurfacing arthroplasty and conventional total hip arthroplasty: a comparative study

Objective To evaluate the blood loss in total hip resurfacing arthroplasty (HRA) comparing with conventional total hip arthroplasty (THA). Methods From January, 2009 to December, 2009, 34 patients were performed total hip resurfacing arthroplasty(HRA group) and 33 patients were performed convetional total hip arthroplasty (THA group). All the operations were conducted by the same surgeon. HRA group involved 20 males and 14 females with an average age of 48.7 years (range, 21-65 years). THA group involved 16 males and 17 females with an average age of 57.4 years (range, 39-65 years). All arthroplasties were primary and unilateral. Total perioperative blood loss included perioperative visible blood loss and hidden blood loss. Using Gross formula, the total blood loss was calculated according to height, weight and pre-and postoperation hematocrit (HCT), while the hidden hemorrhage volume was calculated by subtracting the visible blood loss from total loss. Total perioperative blood loss, visible blood loss, hidden blood loss, length of incision, duration of operation and length of hospital-stay were measured and compared. Results In HRA group, there were less total estimated blood loss [average (1048.0±134.2) ml of HRA group versus (1466.0±167.4) ml of THA group; P0.01], less intraoperative blood loss [average (542.0±68.9) ml of HRA group versus (625.0±86.3) ml of THA group; P0.01] and much less hidden blood loss [average (240.0±43.4) ml of of HRA group versus (462.0±71.5) ml of of THA group; P0.05]. There was shorter duration of hospital stay in HRA group (4.6±0.9) days of HRA group versus (6.1±0.9) days of THA group, P0.05), and longer operation time in HRA group [(114±13.9) min versus (87±18.5)min]. Conclusions Total hip resurfacing arthroplasty gave rise to a positive final impression with regard to really less bleeding and less injury.