title: Comparison of Pre- and Postoperative Hemoglobin and Hematocrit Levels in Hip Arthroscopy.
abstract: OBJECTIVE
  to assess the loss in hematocrit and hemoglobin, if any, 24 hours after hip arthroscopy.
  
  
  METHODS
  thirty-five patients were included. Laboratory tests including complete blood count and white blood cells were performed one week prior to surgery and 24 hours after. Surgical time, volume of saline perfusion and pump perfusion was also recorded.
  
  
  RESULTS
  mean preoperative hematocrit was 42.01% (4.63 SD), whereas mean postoperative hematocrit at 24 h decreased to 36.78% (SD 5.11) (p <0.021.). Mean preoperative hemoglobin was 14.23 g/dL (1.73 SD), and mean postoperative hemoglobin at 24 h decreased to 12.40 g/dL (SD 1.92) (p =0.03.). Platelets and white blood cells, as well as the remaining biochemical parameters showed no significant difference between preoperative and postoperative samples. Lost blood volume worked out with the logarithmic method for estimated blood loss was which 0.78 liters (SD 0.45). Lost blood volume taking into account, the red blood cell mass was also 0.78 liters (SD 0.45).
  
  
  CONCLUSIONS
  a significant decrease in hemoglobin and hematocrit after hip arthroscopy was observed. Although patients did not show clinical signs of anemia or bleeding, blood loss should be considered when planning a hip arthroscopy, especially in patients at risk of anemia. According to our results, we recommend a postoperative control analysis at 24 h.
  
  
  METHODS
  level II, Diagnostic Study.
authors.affiliation: Fundación García-Cugat. Artroscopia GC, Hospital Quirón, Barcelona, Spain ; Department of Anatomy, Universitat Internacional de Catalunya, Spain.
authors.forename: Roberto
authors.initials: R
authors.lastname: Seijas
authors.affiliation: Fundación García-Cugat. Artroscopia GC, Hospital Quirón, Barcelona, Spain.
authors.forename: Wenceslao
authors.initials: W
authors.lastname: Espinosa
authors.affiliation: Orthopedic Department, Hospital Vall d'Hebron, Barcelona, Spain.
authors.forename: Andrea
authors.initials: A
authors.lastname: Sallent
authors.affiliation: Fundación García-Cugat. Artroscopia GC, Hospital Quirón, Barcelona, Spain.
authors.forename: Xavier
authors.initials: X
authors.lastname: Cuscó
authors.affiliation: Fundación García-Cugat. Artroscopia GC, Hospital Quirón, Barcelona, Spain.
authors.forename: Ramón
authors.initials: R
authors.lastname: Cugat
authors.affiliation: Fundación García-Cugat. Artroscopia GC, Hospital Quirón, Barcelona, Spain ; Department of Anatomy, Universitat Internacional de Catalunya, Spain ; Orthopedic Department, Hospital Clínic, Barcelona, Spain.
authors.forename: Oscar
authors.initials: O
authors.lastname: Ares
keywords: Bleeding; blood sample; hematocrit; hemoglobin; hip arthroscopy; surgical bleeding