Drainage is a routine practice used to reduce hematoma and blood loss following total hip arthroplasty. The aim of this study was to assess the effect of clamped drainage on blood loss and wound healing after total hip arthroplasty.
A prospective cohort of 44 patients with hip osteoarthritis or femur head necrosis undergoing total hip arthroplasty was randomized equally into two groups: 6-h postoperative clamped or non-clamped suction tube drainage. Body mass index, gender distribution, preoperative hemoglobin, hip pathology, and affected side were comparable between the two groups. Blood loss, hemoglobin levels, and wound healing complications were recorded and compared between groups.
The drainage blood loss and calculated blood loss volumes were higher for the non-clamped group. About 100 mL more blood loss was noticed in the non-clamped group. There was no significant difference in adverse events or need for transfusion.
The present study showed a statistically significant reduction in postoperative drainage amount between clamped and unclamped drainage groups, but this difference was not large enough to warrant increased blood transfusion requirements in patients with unclamped drainage. Further studies are essential to define the critical period of clamping that is compatible with the dual objectives of reduced blood loss and lack of wound complications from hematoma.