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Review
. 2014 Mar 6;9(1):13.
doi: 10.1186/1749-799X-9-13.

The effects of a tourniquet used in total knee arthroplasty: a meta-analysis

Wei Zhang, Ning Li, Sifeng Chen, Yang Tan, Mohammed Al-Aidaros, Liaobin Chen  1
Affiliations
Review

The effects of a tourniquet used in total knee arthroplasty: a meta-analysis

Wei Zhang et al. J Orthop Surg Res. .

Abstract

Background: The purpose of this research is to evaluate the effects of a tourniquet in total knee arthroplasty (TKA).

Methods: The study was done by randomized controlled trials (RCTs) on the effects of a tourniquet in TKA. All related articles which were published up to June 2013 from Medline, Embase, and Cochrane Central Register of Controlled Trails were identified. The methodological quality of the included studies was assessed by the Physiotherapy Evidence Database (PEDro) scale. The meta-analysis was performed using Cochrane RevMan software version 5.1.

Results: Thirteen RCTs that involved a total of 689 patients with 689 knees were included in the meta-analysis, which were divided into two groups. The tourniquet group included 351 knees and the non-tourniquet group included 338 knees. The meta-analysis showed that using a tourniquet in TKA could reduce intraoperative blood loss (weighted mean difference (WMD), -198.21; 95% confidence interval (CI), -279.82 to -116.60; P<0.01) but did not decrease the calculated blood loss (P=0.80), which indicates the actual blood loss. Although TKA with a tourniquet could save the operation time for 4.57 min compared to TKA without a tourniquet (WMD, -4.57; 95% CI, -7.59 to -1.56; P<0.01), it had no clinical significance. Meanwhile, the use of tourniquet could not reduce the possibility of blood transfusion (P>0.05). Postoperative knee range of motion (ROM) in tourniquet group was 10.41° less than that in the non-tourniquet group in early stage (≤ 10 days after surgery) (WMD, -10.41; 95% CI, -16.41 to -4.41; P<0.01). Moreover, the use of a tourniquet increased the risk of either thrombotic events (risk ratio (RR), 5.00; 95% CI, 1.31 to 19.10; P=0.02) or non-thrombotic complications (RR, 2.03; 95% CI, 1.12 to 3.67; P=0.02).

Conclusions: TKA without a tourniquet was superior to TKA with a tourniquet in thromboembolic events and the other related complications. There were no significant differences between the two groups in the actual blood loss. TKA with a tourniquet might hinder patients' early postoperative rehabilitation exercises.

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Figures

Figure 1
Figure 1
Flow chart summarizing the selection process of randomized control trials (RCTs).
Figure 2
Figure 2
Forest plot for blood loss. (a) Intraoperative blood loss between TKA with a tourniquet and TKA without a tourniquet. (b) Postoperative visible blood loss between TKA with a tourniquet and TKA without a tourniquet. (c) Calculated blood loss between TKA with a tourniquet and TKA without a tourniquet. (d) Rate of transfusion between TKA with a tourniquet and TKA without a tourniquet. CI confidence interval, IV inverse variance.
Figure 3
Figure 3
Forest plot for operation time between TKA with a tourniquet and TKA without a tourniquet. CI confidence interval, IV inverse variance.
Figure 4
Figure 4
Forest plot for postoperative knee ROM in early stage between TKA with/without a tourniquet. CI confidence interval, M-H Mantel-Haenszel statistics.
Figure 5
Figure 5
Forest plot for thrombotic events and incidence of other complications between TKA with/without a tourniquet. (a) Forest plot for thrombotic events between TKA with a tourniquet and TKA without a tourniquet. (b) Forest plot for the incidence of the other complications between TKA with a tourniquet and TKA without a tourniquet. CI confidence interval, M-H Mantel-Haenszel statistics.
See this image and copyright information in PMC

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