Journal of Orthopaedics and Traumatology

Official Journal of the Italian Society of Orthopaedics and Traumatology

Journal of Orthopaedics and Traumatology Cover Image
Open Access

Tourniquet use during total knee arthroplasty does not modulate the neutrophil-to-lymphocyte ratio, pain, or activity

  • Tyler Barker1Email author,
  • Victoria E. Rogers1,
  • Kimberly B. Brown1,
  • Vanessa T. Henriksen1 and
  • G. Lynn Rasmussen1, 2
Journal of Orthopaedics and TraumatologyOfficial Journal of the Italian Society of Orthopaedics and Traumatology 2016:435

https://doi.org/10.1007/s10195-016-0435-6

Received: 3 March 2016

Accepted: 1 November 2016

Published: 15 November 2016

Abstract

The purpose of our study was to identify the influence of tourniquet use during total knee arthroplasty (TKA) on the neutrophil-to-lymphocyte ratio (NLR) shortly after surgery and patient-reported outcomes (pain and physical activity) from outpatient physical therapy. This retrospective study consisted of 104 subjects who underwent primary unilateral TKA (51 subjects with and 53 subjects without tourniquet assistance) between 2010 and 2012. The NLR was calculated from the absolute neutrophil and lymphocyte counts obtained immediately before and after (1 and 2 days) knee arthroplasty. The Knee Outcome Survey (KOS) of Activities of Daily Living and numeric pain scores collected at the first [33.0 (34.2) days after surgery] and last [85.5 (40.7) days after surgery] outpatient physical therapy visits were extracted from an electronic database. The NLR, pain, and KOS score were not significantly (all p > 0.05) different with tourniquet use. Based on these findings, we conclude that tourniquet use during TKA neither increases systemic inflammation shortly after surgery nor impairs patient-reported outcomes obtained during outpatient physical therapy.

Level of evidence

IV.

Keywords

Neutrophil-to-lymphocyte ratio Total knee arthroplasty Pain Activity

Introduction

Tourniquet use during total knee arthroplasty (TKA) improves acuity by creating a bloodless operating field. However, tourniquet inflation and deflation creates an ischemia–reperfusion response that increases systemic inflammation [1]. Inflammation is essential for host defense and repair processes, but an exaggerated inflammatory response can be detrimental to a variety of physiological systems, including musculoskeletal, immune, and cardiovascular. In recent years, the neutrophil-to-lymphocyte ratio (NLR) has emerged as a sensitive index of systemic inflammation that predicts serious complications, such as pulmonary embolism or cardiovascular disease risk [2, 3]. Deviations in the NLR are also apparent with contrasting arthroplasty procedures (unicompartmental versus tricompartmental) [4], suggesting that the NLR could serve as an indicator for systemic inflammation and for the severity of surgery-induced trauma. Surprisingly, it is unknown if tourniquet use during TKA alters the NLR.

Tourniquet use also increases pain and physical impairment in the days after TKA [5], but it is unknown if tourniquet use impairs outpatient physical rehabilitation in the months after TKA. The purpose of our study was to identify the influence of tourniquet use during TKA on the NLR and patient-reported outcomes from outpatient physical therapy. We hypothesized that tourniquet-assisted TKA would exacerbate the increase in the NLR shortly after surgery and impair patient-reported outcomes (pain and physical function) during outpatient physical therapy.

Materials and methods

Patients who underwent primary unilateral TKA were retrospectively identified using the International Classification of Diseases, 9th Revision code and limited to surgeries performed at one facility (The Orthopedic Specialty Hospital, Murray, UT USA) by one orthopedic surgeon between 2010 and 2012 (n = 462). This time frame was selected because half-way through 2011 the participating surgeon discontinued tourniquet use during TKA without altering other standard of care practices. For the purpose of limiting guideline and practice variability, we also excluded (n = 358) subjects who performed outpatient physical therapy at a separate facility. The final analysis consisted of 104 subjects—51 subjects with and 53 subjects without tourniquet assistance during TKA. Postoperative complications were documented for each subject. This study was approved by the Institutional Review Board at Intermountain Healthcare (Salt Lake City, UT USA).

On the day of surgery, the subjects were taken to the operating room and placed on the table in a supine position while a femoral nerve block was administered. Following administration, the subjects were assisted to a sitting position while spinal anesthetic was provided. The subjects were returned to a supine position and the involved limb was prepared and draped, after which prophylactic antibiotics were administered. For the tourniquet group, the leg was exsanguinated with an Esmarch bandage, and the tourniquet was placed as high as possible on the thigh of the surgical leg, over cast padding, and inflated to 300 mmHg.

Subjects underwent a tricompartmental knee arthroplasty through a medial parapatellar arthrotomy approach with uncemented fixation. After surgery, the tourniquet was deflated (when a tourniquet was used), and following wound closure, a Fresenius Cell Saver (Redmond, WA, USA) Hemovac® drain was put in place in the joint. The medial parapatellar arthrotomy was initially closed using sutures followed by staples or sutures to close subcutaneous tissues and skin in layers. Adaptic and a sterile dressing were applied to the wounds. Subjects were then transferred to the recovery room. In the post-anesthesia care unit, subjects from both groups received patient-controlled analgesia with hydromorphone through a continuous ambulatory delivery device. The Fresenius Cell Saver system drains were removed on the first day after surgery. Tranexamic acid was not used in any subject and no subjects received a reinfusion after TKA.

The NLR was calculated from the absolute neutrophil and lymphocyte counts obtained immediately before (Pre) and after (1 and 2 days) TKA. Outpatient physical rehabilitation was initiated 33 (34.2) days after surgery. The Knee Outcome Survey (KOS) of Activities of Daily Living and numeric pain rating scale (0–10 for current pain) scores from the first and last physical therapy visits [52.5 (25.8) days between visits] and number of physical therapy visits [11.4 (5.9)] were extracted from an electronic database. Subjects were classified as responders if their KOS score increased by ≥11 points [6] or if their pain score decreased by ≥2 points [7].

Data were checked for normality prior to all statistical analyses with the Shapiro–Wilk test. Subject differences between tourniquet groups were assessed using a two-sample t test with a Bonferroni adjusted p value. Categorical variable differences between groups were evaluated using separate Pearson chi-squared tests. Blood chemistry and outpatient physical rehabilitation outcome differences between groups were assessed with separate repeated measures analysis of variance followed by a Bonferroni correction on multiple pairwise comparisons when appropriate. All statistical analyses were performed with SYSTAT (version 13.1, Chicago, IL USA). Data are presented as mean (SD) unless noted otherwise.

Results

Subject characteristics, preoperative blood chemistries, American Society of Anesthesiologists (ASA) score, surgery time, length of stay, and postoperative complications were not significantly different between tourniquet groups (Tables 1 and 2; all p > 0.05). Tourniquet use during TKA did not magnify surgery-induced alterations in white blood cell count (WBC), neutrophil or lymphocyte absolute counts, the NLR, hemoglobin, or hematocrit levels (Table 2; all p > 0.05). Likewise, pain and KOS scores were not significantly different between groups (p value range 0.20−0.98).
Table 1

Subject and general surgery characteristics

 

T−

T+

p value

n (f/m)

53 (28/25)

51 (33/18)

0.22

Age, years

62 (10)

63 (13)

0.81

Height, cm

170 (11)

170 (12)

0.99

Body mass, kg

96.2 (24.7)

99.3 (25.8)

0.53

Body mass index, kg/m2

33.2 (7.3)

34.4 (8.0)

0.42

ASA score, n*

  

0.13

 2

5

1

 

 3

23

17

 

 4

24

30

 

Knee, left/right

23/30

27/24

0.33

Surgery time, min

125 (17)

121 (18)

0.28

Tourniquet, min

NA

73.6 (23.5)

NA

Length of stay, days

3.04 (0.39)

2.96 (0.28)

0.25

Infections, n

1

0

0.32

Allogeneic transfusions, n

0

2

0.15

Manipulations under anesthesia, n

4

9

0.12

Pulmonary embolisms, n

0

0

NA

Deep venous thromboembolism, n

0

0

NA

Readmissions, n**

4

1

0.18

Data presented as mean (SD) unless noted otherwise. T− non-tourniquet-assisted TKA, T+ tourniquet-assisted TKA, NA not applicable

* ASA score was missing for 1 T− subject and for 3 T+ subjects

** Reasons for readmission include abnormal serum enzyme level, tachycardia, other brain condition, atrial fibrillation, other esophagitis

Table 2

Perioperative blood chemistries and outpatient physical therapy data

 

T−

T+

Tourniquet main effect p value

Time main effect p value

Interaction p value

Time-pairwise comparison p-values

Pre vs 1 day

Pre vs 2 days

1-day vs 2 days

Hemoglobin, g/dL

  

0.47

<0.001

0.10

<0.001

<0.001

<0.001

 Pre

14.0 (1.5)

14.0 (1.6)

      

 1-day post

12.0 (1.5)

12.2 (1.4)

      

 2-day post

11.0 (1.3)

11.3 (1.3)

      

Hematocrit, %

  

0.77

<0.001

0.78

<0.001

<0.001

<0.001

 Pre

40.9 (5.6)

40.9 (6.5)

      

 1-day post

35.6 (4.3)

35.7 (4.1)

      

 2-day Post

32.7 (3.7)

33.1 (3.8)

      

WBC, K/uL

  

0.15

<0.001

0.50

<0.001

<0.001

<0.001

 Pre

7.34 (2.42)

6.60 (1.50)

      

 1-day post

11.2 (3.0)

10.3 (2.8)

      

 2-day post

9.63 (2.33)

9.22 (2.00)

      

Neutrophils, K/uL

  

0.38

<0.001

0.47

<0.001

<0.001

<0.001

 Pre

4.37 (1.34)

4.04 (1.24)

      

 1-day post

8.75 (2.31)

8.21 (2.64)

      

 2-day post

6.78 (1.59)

6.72 (1.65)

      

Lymphocytes, K/uL

  

0.58

<0.001

0.27

<0.001

0.004

0.001

 Pre

2.06 (1.26)

1.88 (0.57)

      

 1-day post Post

1.38 (1.42)

1.17 (0.54)

      

 2-day post Post

1.64 (1.23)

1.72 (1.08)

      

NLR

  

0.44

<0.001

0.80

<0.001

<0.001

<0.001

 Pre

2.40 (0.89)

2.35 (1.06)

      

 1-day post

8.62 (5.00)

8.19 (4.07)

      

 2-day post

5.41 (3.32)

4.82 (2.35)

      

 ∆1

6.23 (4.96)

5.78 (3.88)

0.61

     

 ∆2

2.99 (3.16)

2.44 (2.04)

0.29

     

 ∆1-2

−3.23 (5.40)

−3.34 (3.79)

0.91

     

Pain

  

0.20

<0.001

0.46

   

 First PT visit

5.22 (2.24)

4.79 (2.23)

      

 Last PT visit

3.28 (2.67)

2.42 (1.82)

      

 Pain ∆

−2.42 (2.09)

−1.94 (3.10)

0.36

     

Pain responder

26

33

0.24

     

KOS

  

0.82

<0.001

0.87

   

 First PT visit

46.7 (17.1)

47.9 (16.9)

      

 Last PT visit

68.6 (18.4)

69.9 (17.0)

      

 KOS ∆

21.9 (16.3)

21.8 (19.3)

0.98

     

KOS responder

36

42

0.31

     

Data presented as mean (SD)

T− non-tourniquet-assisted TKA, T+ tourniquet-assisted TKA, PT physical therapy, WBC white blood cell, ∆1 change from Pre to 1 day, ∆2 change from Pre to 2 days, ∆1-2 change from 1 day to 2 day

Discussion

In contrast to our hypothesis, the increase in the NLR was not modulated by tourniquet use during TKA. This finding is consistent with a previous study demonstrating that tourniquet-assisted TKA did not exacerbate the systemic increase in C-reactive protein following knee arthroplasty [8]. However, the findings by Matziolis et al. [8] and those in the present study could be limited by protocol design as the earliest postoperative assessments of systemic inflammation were performed 1 day after surgery. Consistent with this perceived limitation, data demonstrate an exaggerated inflammatory response within 24 h after tourniquet-assisted TKA [1]. Thus, the systemic inflammatory response to tourniquet-assisted TKA could be temporally dependent with deviations likely apparent within the first 24 h after surgery.

Similar to the NLR, pain levels reported during outpatient physical therapy were not altered by tourniquet use during TKA. This finding contrasts with an earlier report showing tourniquet use during TKA increases postoperative pain shortly (4 h) after knee arthroplasty [9]. Considering the present study’s first postoperative pain assessment was obtained ~33 days after surgery, it is plausible that tourniquet-induced pain is more readily apparent within hours but not days after TKA.

Data also indicate that tourniquet assistance during TKA impedes progression in an objective-based measure of physical performance, such as muscle strength and knee range of motion [9]. However, in the present investigation, tourniquet use did not alter patient-reported physical activity levels during outpatient physical therapy. While improvements in subjective-based outcomes exceed those of more objectively routed measures following TKA [10], it remains unknown if tourniquet use during TKA contributes to the discordance of findings between subjective and objective outcomes after surgery. Clearly, future research investigating the role of tourniquet use on subjective- and objective-based physical performance outcomes following TKA is warranted.

There are some limitations with this study that are worthy of discussion. First, besides the NLR, no other biomarkers of systemic inflammation were examined. However, previous research performed in non-orthopedic patients (i.e., cardiovascular and colorectal cancer) demonstrates that the NLR associates with other common indices of systemic inflammation, such as C-reactive protein and interleukin-6 [11, 12]. Second, including blood clotting, range of motion, and objective-based outcomes would strengthen the evaluation of tourniquet use during knee arthroplasty. Future research is needed to identify the association between the NLR and other systemic indices of inflammation and objective-based outcomes following TKA.

In summary, tourniquet use during TKA did not increase systemic inflammation or hinder patient-reported outcomes. Based on these findings, we conclude that tourniquet use during TKA neither increases systemic inflammation nor is detrimental to patient-reported outcomes during physical therapy.

Declarations

Compliance with ethical standards

Conflict of interest

There are no conflicting or competing interests.

Ethical standards

All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards. This study was approved by the Institutional Review Board and consent was waived for this retrospective chart review study.

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

Authors’ Affiliations

(1)
The Orthopedic Specialty Hospital
(2)
The Orthopedic Specialty Clinic

References

  1. Kageyama K, Nakajima Y, Shibasaki M, Hashimoto S, Mizobe T (2007) Increased platelet, leukocyte, and endothelial cell activity are associated with increased coagulability in patients after total knee arthroplasty. J Thromb Haemost 5:738–745View ArticlePubMedGoogle Scholar
  2. Kayrak M, Erdogan HI, Solak Y, Akilli H, Gul EE, Yildirim O et al (2014) Prognostic value of neutrophil to lymphocyte ratio in patients with acute pulmonary embolism: a restrospective study. Heart Lung Circ 23:56–62View ArticlePubMedGoogle Scholar
  3. Horne BD, Anderson JL, John JM, Weaver A, Bair TL, Jensen KR et al (2005) Which white blood cell subtypes predict increased cardiovascular risk? J Am Coll Cardiol 45:1638–1643View ArticlePubMedGoogle Scholar
  4. Barker T, Rogers VE, Henriksen VT, Brown KB, Trawick RH, Momberger NG, Rasmussen GL (2016) Is there a link between the neutrophil-to-lymphocyte ratio and venous thromboembolic events after knee arthroplasty? A pilot study. J Orthop Traumatol 17(2):163–168View ArticlePubMedGoogle Scholar
  5. Vandenbussche E, Duranthon LD, Couturier M, Pidhorz L, Augereau B (2002) The effect of tourniquet use in total knee arthroplasty. Int Orthop 26:306–309View ArticlePubMedPubMed CentralGoogle Scholar
  6. Impellizzeri FM, Mannion AF, Leunig M, Bizzini M, Naal FD (2011) Comparison of the reliability, responsiveness, and construct validity of 4 different questionnaires for evaluating outcomes after total knee arthroplasty. J Arthroplasty 26:861–869View ArticlePubMedGoogle Scholar
  7. Salaffi F, Stancati A, Silvestri CA, Ciapetti A, Grassi W (2004) Minimal clinically important changes in chronic musculoskeletal pain intensity measured on a numerical rating scale. Eur J Pain 8:283–291View ArticlePubMedGoogle Scholar
  8. Matziolis G, Drahn T, Schroder JH, Krocker D, Tuischer J, Perka C (2005) Endothelin-1 is secreted after total knee arthroplasty regardless of the use of a tourniquet. J Orthop Res 23:392–396View ArticlePubMedGoogle Scholar
  9. Abdel-Salam A, Eyres KS (1995) Effects of tourniquet during total knee arthroplasty. A prospective randomised study. J Bone Joint Surg Br 77:250–253PubMedGoogle Scholar
  10. Meier W, Mizner RL, Marcus RL, Dibble LE, Peters C, LaStayo PC (2008) Total knee arthroplasty: muscle impairments, functional limitations, and recommended rehabilitation approaches. J Orthop Sports Phys Ther 38:246–256View ArticlePubMedGoogle Scholar
  11. Akpek M, Kaya MG, Lam YY, Sahin O, Elcik D, Celik T et al (2012) Relation of neutrophil/lymphocyte ratio to coronary flow to in-hospital major adverse cardiac events in patients with ST-elevated myocardial infarction undergoing primary coronary intervention. Am J Cardiol 110:621–627View ArticlePubMedGoogle Scholar
  12. Chen ZY, Raghav K, Lieu CH, Jiang ZQ, Eng C, Vauthey JN et al (2015) Cytokine profile and prognostic significance of high neutrophil-lymphocyte ratio in colorectal cancer. Br J Cancer 112:1088–1097View ArticlePubMedPubMed CentralGoogle Scholar

Copyright

© The Author(s) 2016

Advertisement