title: Subcutaneous versus intraarticular closed suction indwelling drainage after total knee arthroplasty: A randomised control trial.
abstract: BACKGROUND
  Total knee arthroplasty (TKA) is widely accepted treatment for moderate or severe osteoarthritis and rheumatoid arthritis. Significant blood loss can be seen during the early postoperative period where a blood transfusion may be necessary. Closed suction drainage is known to prevent the formation of hematomas in the operative field, decrease tension on incisions, diminish delayed wound healing and reduce the risk of infection. Subcutaneous indwelling closed suction drainage method has been known to be beneficial and an alternative to the intraarticular indwelling method. This prospective randomized study was to compare the visible, hidden, total blood loss and postoperative hemodynamic change of subcutaneous and intraarticular indwelling closed suction drainage method after TKA.
  
  
  METHODS
  One hundred and sixty patients with primary osteoarthritis who underwent unilateral TKA were enrolled; group A with subcutaneous (n = 78) and group B with intraarticular (n = 79) indwelling closed suction drainage method. Total blood loss, visible blood loss, internal blood loss, postoperative day 1, 5(th), 10(th) day hemoglobin, hematocrit levels were compared. Allogeneic blood transfusion rate and complications related to soft tissue hematoma formation were additionally compared.
  
  
  RESULTS
  Allogenic transfusion requirements between subcutaneous drainage group and intraarticular drainage groups (6.4% vs. 24.1%) were significantly different (P = 0.002). Although the minor complications such as the incidence of bullae formation and the ecchymosis were higher in the subcutaneous indwelling group, the functional outcome at postoperative 2 year did not demonstrate the difference from intraarticular drainage group.
  
  
  CONCLUSIONS
  Subcutaneous indwelling closed suction drainage method is a reasonable option after TKA for reduction of postoperative bleeding and transfusion rate.
authors.affiliation: Department of Orthopedic Surgery, Veterans Health Service Medical Center, Seoul, South Korea.
authors.forename: Jae-Hyuk
authors.initials: JH
authors.lastname: Yang
authors.affiliation: Department of Orthopedic Surgery, Veterans Health Service Medical Center, Seoul, South Korea.
authors.forename: Jung-Ro
authors.initials: JR
authors.lastname: Yoon
authors.affiliation: Department of Orthopedic Surgery, Veterans Health Service Medical Center, Seoul, South Korea.
authors.forename: Anshul
authors.initials: A
authors.lastname: Dahuja
authors.affiliation: Department of Orthopedic Surgery, Veterans Health Service Medical Center, Seoul, South Korea.
authors.forename: Seungyeop
authors.initials: S
authors.lastname: Song
keywords: Arthroplasty; Blood loss; blood loss; closed suction; drainage; drainage system; knee; postoperative; replacement; subcutaneous; suction; total knee arthroplasty