A comparison of blood loss and the need for transfusion following primary total knee replacement with or without the use of a tourniquet
Keywords:Knee replacement, Tourniquet, Blood loss
Background: Primary total knee replacement (TKR) has traditionally been carried out with the use of a tourniquet. More recent trends towards performing the surgery without a tourniquet have had some support in the literature and may improve patient recovery.
Methods: A retrospective cohort of 198 consecutive primary TKRs from our institution were identified and analysed, 52 used a tourniquet and 146 did not. All TKRs also utilised a standardised interventions protocol including withholding of anticoagulants and antiplatelet medications, topical adrenaline injection, and both IV and topical tranexamic acid. Outcomes measured were estimated intra-operative blood loss, overall blood loss through comparison of pre and post-operative haemoglobin laboratory values, and the need for post-operative blood transfusion.
Results: Analysis demonstrated a statistically significant reduction in estimated intra-operative blood loss when a tourniquet was used (p<0.001). However, overall blood loss indicated by the haemoglobin drop after surgery was not significantly affected by tourniquet use (p=0.342). Transfusion requirements were also similar among the groups (4.8% vs. 5.8%) and no tendency was suggested towards an increased rate of transfusion in the non-tourniquet group.
Conclusions: Our study shows that although estimated intra-operative blood loss is increased without a tourniquet, total blood loss as measured by haemoglobin levels is no different for primary TKRs that use a tourniquet and those that do not. Furthermore there is no difference in post-operative blood transfusion rates. It is our hope that this study will add to the body of evidence for surgeons to consider no longer using a tourniquet for primary TKR.
NJR 14th Annual Report 2017. Available at: http://www.njrreports.org.uk/Portals/0/PDFdownloads/NJR%2014th%20Annual%20Report%202017.pdf. Accessed on 23 February 2018.
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