Assessment of blood loss in total knee arthroplasty depending on the type of the endoprosthesis

. In the modern conditions arthroplasty of joints has become one of the main methods of treatment that enables to restore joint movements, weight bearing ability and quickly return the patient to an active lifestyle. Total knee arthroplasty (TKA) is accompanied by a significant blood loss resulting in a decrease of hemoglobin level and higher requirements in postoperative blood transfusion. Purpose of the study: to estimate the volume of blood loss in patients after total knee arthroplasty depending on the design of the endoprosthesis. Patients and methods. Retrospective study included 73 patients with stage 3 gonarthrosis by Kosinskaya. All patients were divided into groups: in group 1 (n=50) the standard total cemented knee joint endoprosthesis; in group 2 (n=23) - the associated rotational constructions were used. Hemoglobin and hematocrit tests were performed prior to and in 24 hours after operation. The volume of intra- and postoperative (in 24 hours) blood loss was calculated by the of hemoglobin balance formula. Results. In 24 hours after operation the hemoglobin level was 122.5 ± 9.6 g/l in patients from group 1 and 105.1±8.2 g/l (p=0.001) in patients from group 2. The difference in hemoglobin levels in patients within group 1 was 10.5±6.6 g/l, within group 2 - 28.5±7.5 g/l (p=0.006). The volume of intra- and postoperative (in 24 hours) blood loss for the 1st and 2nd patient groups of made up 420.5±276.7 ml, in group 2 it was 1163.0±302.5 ml (p