The Role of ESR and CRP in Preoperative Workup for Total Knee Arthroplasty

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Should ESR and CRP be Included in the
Routine Preoperative Workup for Primary Total
Knee Arthroplasty?
Dale T. Landry Jr., MD
Vinod Dasa, MD
Disclosures
Dale T. Landry Jr., MD
None
Vinod Dasa, MD
Paid Consultant
Bioventus
Myoscience
Stock
Pacira
Research Support
Cropper Medical
Department of Defense
Background
Periprosthetic Joint Infection (PJI)
Most devastating complication of total joint arthroplasty
Most common reason for total knee arthroplasty 
1
1% - 3% incidence with Primary Osteoarthritis 
2-3
2% - 4% incidence with Rheumatoid Arthritis 
4-5
3% - 7% incidence with Diabetes 
6-7
Cost of treatment of PJI over $50,000 per patient 
8
Overall yearly cost of greater than $300,000,000 
2-3, 8
1.
Bozic KJ, et.al
. The epidemiology of revision total knee arthroplasty in the United States. Clin Orthop Relat Res. 2010;468:45-51.
2.
Phillips JE, et.al.. 
The incidence of deep prosthetic infections in a specialist orthopaedic hospital: a 15-year prospective survey. J Bone
Joint Surg Br. 2006;88:943-8.
3.
Della Valle CJ, et.al. PE. 
Periprosthetic sepsis. Clin Orthop Relat Res. 2004;420:26-31.
4.
Wilson, M. G.; et.al.. 
Infection as a complication of total knee-replacement arthroplasty. Risk factors and treatment in sixty-seven cases.
J. Bone and Joint Surg., 12-A: 878-883, July 1990
5.
Poss, R.; et.al.. 
Factors influencing the incidence and outcome of infection following total joint arthroplasty. Clin. Orthop., 182:117-
126,1984.
6.
England, S. P.; et.al.
. Total knee arthroplasty in diabetes mellitus. Clin. Orthop., 260: 130-134,1990.
7.
Papagelopoulos, P, et.al.. Long term outcome and survivorship analysis of primary total knee arthroplasty in patients with diabetes
mellitus. Clin. Orthop., 330:124-132,1996.
8.
Maderazo, E. G.; et.al. 
Late infections of total joint prostheses. A review and recommendations for prevention. Clin. Orthop., 229:131-
142,1988
Background
Erythrocyte Sedimentation Rate (ESR) & C-Reactive Protein (CRP)
Simple, inexpensive, readily available, and accurate
Measures of the Acute Phase Reaction
Diagnosis of PJI
Treatment of PJI by following the trends
ESR/CRP in combination are effective tools for helping diagnose PJI
Postop elevated levels of ESR/CRP are predictors of PJI 
9-11
Normal trends of ESR/CRP following THA/TKA are well-studied
9.
Della Valle C, et.al.
. Preoperative testing for sepsis before revision total knee arthroplasty. J Arthroplasty. 2007;22(6 Suppl. 2):90-3.
10.
Greidanus NV, et.al.
. Use of erythrocyte sedimentation rate and C-reactive protein level to diagnose infection before revision total knee
arthroplasty. A prospective evaluation. J Bone Joint Surg Am. 2007;89:1409-16.
11.
Parvizi J, et.al.
. Diagnosis of infected total knee: findings of a multicenter database. Clin Orthop Relat Res. 2008;466:2628-33..
Background
Erythrocyte Sedimentation Rate (ESR) 
12-13
Peaks on post-op day 5
Returns to normal at 7-9 months with TKA
C-Reactive Protein (CRP) 
14-15
Peaks on post-op day 2
Returns to normal by 3-4 weeks with TKA
Remains WNL for aseptic loosening 
16
ESR/CRP nonspecific for PJI, and can be elevated in a number of
other medical conditions 
17
12.
Park KK, et.al
: Normative Temporal Values of CRP and ESR in Unilateral and Staged Bilateral TKA. Clin Orthop Relat Res. 2008
Jan;466(1):179-88. Epub 2008 Jan 3.
13.
Bilgen O, et.al.
.: C-reactive protein values and erythrocyte sedimentation rates after total hip and total knee arthroplasty. J Int Med Res. 2001
Jan-Feb;29(1):7-12
14.
Larsson S, et.al.
.: C-reactive protein (CRP) levels after elective orthopedic surgery. Clin Orthop Relat Res. 1992 Feb;(275):237-42.
15.
Niskanen, R. O, et.al., H.: 
Serum C-reactive protein levels after total hip and knee arthroplasty. J. Bone and Joint Surg., 78-B(3): 431-
433,1996.
16.
Shih, L.-Y., et.al.: 
Erythrocyte sedimentation rate and C-reactive protein values in patients with total hip arthroplasty. Clin. Orthop., 225:238-
246,1987.
17.
Nielen M, et.al.
. Increased levels of C-reactive protein in serum from blood donors before the onset of rheumatoid arthritis. Arthritis &
Rheumatology. 2004; 50: 2423 – 2427
Background
Sensitivity for PJI 
18-19
Elevated ESR
 
.82
Elevated CRP
 
.96
Excellent Negative Predictive Value when both are WNL
Combination of ESR/CRP shown to be a cost-effective screening
protocol for diagnosis of PJI 
20
Similar findings of the usefulness of combined ESR and CRP in the
setting of PJI following TKA or THA have been reported
 21-22
18.
Spangehl MJ, et. al.
.  Prospective analysis of preoperative and intraoperative investigations for the diagnosis of infection at the sites of two
hundred and two revision total hip arthroplasties. J Bone Joint Surg Am. 1999 May;81(5):672-83
19.
Greidanus NV, et. al.. 
Use of erythrocyte sedimentation rate and C-reactive protein level to diagnose infection before revision total knee
arthroplasty. A prospective evaluation. J Bone Joint Surg Am. 2007 Jul;89(7):1409-16.
20.
Austin MS, et. al. 
.: A simple, cost-effective screening protocol to rule out periprosthetic infection. J Arthroplasty. 2008 Jan; 23(1):65-8
21.
Bernard L, et. al
.: Value of preoperative investigations in diagnosing prosthetic joint infection: retrospective cohort study and literature
review. Scand J Infect Dis. 2004;36(6-7):410-6.
22.
Schinsky M, Della Valle C
. Perioperative testing for joint infection in patients undergoing revision total hip arthroplasty. J Bone Joint Surg
Am. 2008; 90: 1869 – 1875.
Background
Normal Range of ESR 
23-24
Patient < 50 yrs
Males < 15 mm/hr
Females < 25 mm/hr
Patient > 50 yrs
Males < 20 mm/hr
Females < 30mm/hr
Normal Range of CRP 
25
CRP < 8.2mg/L
23.
Caswell M. 
Effect of patient age on tests of the acute-phase response. Arch Pathol Lab Med 1993;117:906–909
24.
Bottinger LE, et. al. Normal erythrocyte sedimentation rate and age. Br Med J. 1967 Apr 8;2(5544):85-7
25.
Shine B, et. al.
. Solid-Phase Radioimmunoassays for C-reactive protein. Clin. Chim. Acta. 1981; 117:13–23.
Background
However, patients undergoing Total Knee Arthroplasty have other
comorbid medical conditions that may affect ESR/CRP
Urinary Tract Infection 
26
Rheumatoid Arthritis 
27
Hepatitis-C 
28
Crohn’s Disease 
29
Systemic Lupus Erythematosis 
30
Psoriasis 
31
Obesity 
32
26.
Rohrmann S, et. al.
 Serum C-reactive protein concentration and lower urinary tract symptoms in older men in the Third National Health and Nutrition
Examination Survey (NHANES III). The Prostate. 2005; 62: 27 – 33.
27.
Nielen M, et. al.. 
Increased levels of C-reactive protein in serum from blood donors before the onset of rheumatoid arthritis. Arthritis & Rheumatology. 2004;
50: 2423 – 2427.
28.
Salter M, et. al.
. Correlates of Elevated Interleukin-6 and C-Reactive Protein in Persons With or at High Risk for HCV and HIV Infections. Journal of Acquired
Immune Deficiency Syndromes. 2013; 24: 488 – 495.
29.
Fagan E, et. al.
. Serum levels of C-reactive protein in Crohn's disease and ulcerative colitis. European Journal of Clinical Investigation. 1982; 12: 351 – 359.
30.
Borg E, et. al
. C-reactive protein levels during disease exacerbations and infections in systemic lupus erythematosus: a prospective longitudinal study. The
Journal of Rheumatology. 1990; 17: 1642 – 1648
31.
Stern, S. H.; et. al.
. Total knee arthroplasty in patients with psoriasis. Clin. Orthop., 248:108-111,1989.
32.
Wilson, M. Get. Al.
. Infection as a complication of total knee-replacement arthroplasty. Risk factors and treatment in sixty-seven cases. J. Bone and Joint
Surg., 12-A: 878-883, July 1990
Background
Little data exists on interpretation of preoperative Elevated ESR/CRP
No data exists on how to interpret postoperatively elevated ESR/CRP
levels in the setting of preoperative elevation
 
Study Purpose
Primary
Define the prevalence of preoperatively elevated ESR and CRP
within a cohort of healthy patients undergoing primary Total Knee
Arthroplasty
Secondary
Define any comorbidities that may contribute to preoperatively
elevated ESR and CRP
 
Materials & Methods
Retrospective chart review of patients who underwent Primary TKA
with one surgeon between October 2009 – May 2011
Demographics Including
Age
Gender
BMI
Medical Comorbidities
Pre-Op Lab Values Recorded
CRP
ESR
WBC
 
Materials & Methods
Overall Cohort Inclusion Criteria
Total Knee Arthroplasty from October 2007 – May 2011
Pre-Op Labs Within 30 Days of Procedure
WBC/ESR/CRP
At Least Six Months of Follow-Up
94 Patients
Idiopathic Cohort Exclusion Criteria
Previous Arthroplasty Performed
Pre-Op Infection/UTI
Chronic Inflammatory Process
78 Patients
 
Results
Overall Cohort
Elevated ESR
41.5% (31/94)
Elevated CRP
28.7% (27/94)
Idiopathic Cohort
Elevated ESR
38.5% (30/78)
Elevated CRP
26.9% (21/78)
 
Comparison of Overall Cohort and Idiopathic Cohort
of Elevated ESR/CRP by Percent vs BMI (kg/m
2
)
Patients with BMI of 18.5 – 24.9
0% Elevated ESR
0% Elevated CRP
Patients with BMI of 25 – 29.9
23.5% Elevated ESR
11.8% Elevated CRP
Patients with BMI of 30 – 39.9
36 % Elevated ESR
19.5% Elevated CRP
Patients with BMI > 40
64.7% Elevated ESR
64.7% Elevated CRP
 
Comparison in Idiopathic Cohort of BMI Classification to
Mean ESR and CRP
 
Conclusions
Significant number of otherwise healthy patients undergoing TKA
with idiopathically elevated ESR/CRP
Elevated ESR 
 
38.5%
Elevated CRP
 
26.9%
It is inappropriate to assume that an otherwise healthy patient has a
normal ESR/CRP prior to undergoing primary joint arthroplasty
 
Conclusions
Direct correlation between BMI category and ESR/CRP
Preoperatively, as patient’s BMI category increases, one should
assume that their ESR/CRP levels are likely elevated
Patients with BMI of 18.5 – 24.9 kg/m
2
»
0% Elevated ESR
»
0% Elevated CRP
Patients with BMI of 25 – 29.9 kg/m
2
»
23.5% Elevated ESR
»
11.8% Elevated CRP
Patients with BMI of 30 – 39.9 kg/m
2
»
36 % Elevated ESR
»
19.5% Elevated CRP
Patients with BMI > 40 kg/m
2
»
64.7% Elevated ESR
»
64.7% Elevated CRP
 
Conclusions
As BMI category increases, so to does the mean of both elevated
ESR/CRP as well as the mean of normal ESR/CRP
If periprosthetic infection is present, what threshold ESR/CRP
levels in different BMI classes should be used to determine
infection clearance and timeliness of arthroplasty re-implantation?
Suggests that large scale prospective studies should be performed
to determine more accurate BMI category-specific normal
reference ranges for ESR/CRP
 
Conclusions
Until the results of this study are validated or refuted with large scale
trials, one should consider attaining preoperative ESR/CRP values on
all patients undergoing joint arthroplasty
Cheap & Readily available
May help put elevated post-op ESR/CRP values into perspective in
a patient with a painful arthroplasty
Do these elevated values represent true periprosthetic
infection?
Are these lab values being interpreted as elevated when in fact
they are WNL with respect to the patient’s BMI?
 
Acknowledgments
 
Vinod Dasa, MD
Louisiana State University Health Sciences Center
Department of Orthopaedic Surgery
Ochsner Medical Center Kenner
References
 
1.
Bozic KJ, Kurtz SM, Lau E, Ong K, Chiu V, Vail TP, Rubash HE, Berry DJ.
 The epidemiology of
revision total knee arthroplasty in the United States. Clin Orthop Relat Res. 2010;468:45-51.
2.
Bozic KJ, Kurtz SM, Lau E, Ong K, Vail TP, Berry DJ.
 The epidemiology of revision total hip
arthroplasty in the United States. J Bone Joint Surg Am. 2009;91:128-33.
3.
Maderazo, E. G.; Judson, S.; 
and 
Pasternak, H.: 
Late infections of total joint prostheses. A review and
recommendations for prevention. 
Clin. Orthop., 
229:131-142,1988
4.
Phillips JE, Crane TP, Noy M, Elliott TS, Grimer RJ.
 The incidence of deep prosthetic infections in a
specialist orthopaedic hospital: a 15-year prospective survey. J Bone Joint Surg Br. 2006;88:943-8.
5.
Della Valle CJ, Zuckerman JD, Di Cesare PE.
 Periprosthetic sepsis. Clin Orthop Relat Res.
2004;420:26-31.
6.
Peersman G, Laskin R, Davis J, PetersonM.
 Infection in total knee replacement: a retrospective review
of 6489 total knee replacements. Clin Orthop Relat Res. 2001; 392:15-23.
7.
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9.
Mason JB, Fehring TK,OdumSM, GriffinWL, Nussman DS.
 The value of white blood cell counts
before revision total knee arthroplasty. J Arthroplasty. 2003;18:1038-43.
10.
Della Valle CJ, Sporer SM, Jacobs JJ, Berger RA, Rosenberg AG, Paprosky WG.
 Preoperative
testing for sepsis before revision total knee arthroplasty. J Arthroplasty. 2007;22(6 Suppl. 2):90-3.
References
 
11.
Greidanus NV, Masri BA, Garbuz DS, Wilson SD, McAlinden MG, Xu M, Duncan CP.
 Use of
erythrocyte sedimentation rate and C-reactive protein level to diagnose infection before revision total
knee arthroplasty. A prospective evaluation. J Bone Joint Surg Am. 2007;89:1409-16.
12.
Parvizi J, Ghanem E, Sharkey P, Aggarwal A, Burnett RS, Barrack RL.
 Diagnosis of infected total
knee: findings of a multicenter database. Clin Orthop Relat Res. 2008;466:2628-33.
13.
Caswell M
. Effect of patient age on tests of the acute-phase response. Arch Pathol Lab Med
1993;117:906–909.
14.
Shine B, de Beer F
. Solid-Phase Radioimmunoassays for C-reactive protein. Clin. Chim. Acta. 1981;
117:13–23.
15.
Rohrmann S, De Marzo A
. Serum C-reactive protein concentration and lower urinary tract symptoms in
older men in the Third National Health and Nutrition Examination Survey (NHANES III). The Prostate.
2005; 62: 27 – 33.
16.
Nielen M, Schaardenburg D.
 Increased levels of C-reactive protein in serum from blood donors before
the onset of rheumatoid arthritis. Arthritis & Rheumatology. 2004; 50: 2423 – 2427.
17.
Salter M, Lau B
. Correlates of Elevated Interleukin-6 and C-Reactive Protein in Persons With or at High
Risk for HCV and HIV Infections. Journal of Acquired Immune Deficiency Syndromes. 2013; 24: 488 –
495.
18.
Fagan E, Dyck R
. Serum levels of C-reactive protein in Crohn's disease and ulcerative colitis. European
Journal of Clinical Investigation. 1982; 12: 351 – 359.
19.
Borg E, Horst G
. C-reactive protein levels during disease exacerbations and infections in systemic lupus
erythematosus: a prospective longitudinal study. The Journal of Rheumatology. 1990; 17: 1642 – 1648
References
 
20.
Vessely MB, Whaley AL, Harmsen WS, Schleck CD, Berry DJ
. Long-term survivorship and failure
modes of 1000 cemented condylar total knee arthroplasties. 
Clin Orthop Relat Res.
 2006 Nov;452:28-34.
21.
Fehring TK, Odum S, Griffin WL, Mason JB, Nadaud M.
 Early failures in total knee arthroplasty.
Clin Orthop Relat Res.
 2001 Nov;(392):315-8.
22.
Wilson, M. G.; Kelley, K.; and Thornhill, T. S
.
 Infection as a complication of total knee-replacement
arthroplasty. Risk factors and treatment in sixty-seven cases
. J. Bone and Joint Surg
., 12-A: 878-883,
July 1990
23.
Poss, R.; Thornhill, T. S.; Ewald, F. C; Thomas, W. H.; Batte, N. J.; and Sledge, C. B.
 Factors
influencing the incidence and outcome of infection following total joint arthroplasty. Clin. Orthop.,
182:117-126,1984.
24.
England, S. P.; Stern, S. H.; Insall, J. N.; and Windsor, R. E.
 Total knee arthroplasty in diabetes
mellitus. Clin. Orthop., 260: 130-134,1990.
25.
Papagelopoulos, P. J.; Idusuyi, O. B.; Wallrichs, S. L.; and Morrey, B. F.
 Long term outcome and
survivorship analysis of primary total knee arthroplasty in patients with diabetes mellitus. Clin. Orthop.,
330:124-132,1996.
26.
Rand, J. A., and Fitzgerald, R. H., Jr
. Diagnosis and management of the infected total knee
arthroplasty. Orthop. Clin. North America, 20:201-210,1989.
27.
Greene, K. A.; Wilde, A. N.; and Stulberg, B. N.
 Preoperative nutritional status of total joint patients.
Relationship to postoperative wound complications. J. Arthroplasty, 6: 321-325,1991
References
 
28.
Jensen, J. E.; Jensen, T. G.; Smith, T. K.; Johnston, D. A.; and Dudrick, S. J
. Nutrition in
orthopaedic surgery. J. Bone and Joint Surg., 64-A: 1263-1272, Dec. 1982.
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Smith, T. K.
: Nutrition: its relationship to orthopedic infections. Orthop. Clin. North America, 22:373-
377,1991
30.
Gherini, S.; Vaughn, B. K.; Lombardi, A. V., Jr.; and Mallory, T. H.
 Delayed wound healing and
nutritional deficiencies after total hip arthroplasty. Clin. Orthop., 293:188-195,1993.
31.
Stern, S. H.; Insall, J. N.; Windsor, R. H.; Inglis, A. E.; and Dines, D. M.
 Total knee arthroplasty in
patients with psoriasis. Clin. Orthop., 248:108-111,1989.
32.
Park KK, Kim TK, Chang CB, Yoon SW, Park KU.
: Normative Temporal Values of CRP and ESR in
Unilateral and Staged Bilateral TKA. Clin Orthop Relat Res. 2008 Jan;466(1):179-88. Epub 2008 Jan 3.
33.
Larsson S, Thelander U, Friberg S.
: C-reactive protein (CRP) levels after elective orthopedic surgery.
Clin Orthop Relat Res. 1992 Feb;(275):237-42.
34.
Bilgen O, Atici T, Durak K, Karaeminoğullari, Bilgen MS.: 
C-reactive protein values and erythrocyte
sedimentation rates after total hip and total knee arthroplasty. J Int Med Res. 2001 Jan-Feb;29(1):7-12
 
35.
Niskanen, R. O.; Korkala, O.; and Pammo, H.
: Serum C-reactive protein levels after total hip and
knee arthroplasty. J. Bone and Joint Surg., 78-B(3): 431-433,1996.
36.
Shih, L.-Y.; Wu, J.-J.; and Yang, D.-J.
: Erythrocyte sedimentation rate and C-reactive protein values in
patients with total hip arthroplasty. Clin. Orthop., 225:238-246,1987.
37.
Austin MS, Ghanem E, Joshi A, Lindsay A, Parvizi J
.: A simple, cost-effective screening protocol to
rule out periprosthetic infection. J Arthroplasty. 2008 Jan; 23(1):65-8.
References
 
38.
Spangehl MJ, Masri BA, O'Connell JX, Duncan CP
.: Prospective analysis of preoperative and
intraoperative investigations for the diagnosis of infection at the sites of two hundred and two revision
total hip arthroplasties. J Bone Joint Surg Am. 1999 May;81(5):672-83.
39.
Greidanus NV, Masri BA, Garbuz DS, Wilson SD, McAlinden MG, Xu M, Duncan CP.
:Use of
erythrocyte sedimentation rate and C-reactive protein level to diagnose infection before revision total
knee arthroplasty. A prospective evaluation. J Bone Joint Surg Am. 2007 Jul;89(7):1409-16.
40.
Bernard L, Lübbeke A, Stern R, Bru JP, Feron JM, Peyramond D, Denormandie P, Arvieux C,
Chirouze C, Perronne C, Hoffmeyer P; Groupe D'Etude Sur L'Ostéite
.: Value of preoperative
investigations in diagnosing prosthetic joint infection: retrospective cohort study and literature review.
Scand J Infect Dis. 2004;36(6-7):410-6.
41.
Schinsky M, Della Valle C
. Perioperative testing for joint infection in patients undergoing revision total
hip arthroplasty. J Bone Joint Surg Am. 2008; 90: 1869 – 1875.
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Thank You
 
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Preoperative assessment for primary total knee arthroplasty should consider including ESR and CRP levels as routine tests due to their accuracy in diagnosing periprosthetic joint infection (PJI). Elevated postoperative ESR/CRP levels can serve as predictors of PJI, aiding in prompt diagnosis and treatment. Understanding the normal trends of ESR and CRP post-surgery is crucial in monitoring patient recovery and identifying potential complications such as aseptic loosening. Incorporating these simple and cost-effective tests in the preoperative workup can enhance the management of patients undergoing total knee arthroplasty.

  • Total Knee Arthroplasty
  • ESR
  • CRP
  • Preoperative Workup
  • Periprosthetic Joint Infection

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  1. Should ESR and CRP be Included in the Routine Preoperative Workup for Primary Total Knee Arthroplasty? Dale T. Landry Jr., MD Vinod Dasa, MD

  2. Disclosures Dale T. Landry Jr., MD None Vinod Dasa, MD Paid Consultant Bioventus Myoscience Stock Pacira Research Support Cropper Medical Department of Defense

  3. Background Periprosthetic Joint Infection (PJI) Most devastating complication of total joint arthroplasty Most common reason for total knee arthroplasty 1 1% - 3% incidence with Primary Osteoarthritis 2-3 2% - 4% incidence with Rheumatoid Arthritis 4-5 3% - 7% incidence with Diabetes 6-7 Cost of treatment of PJI over $50,000 per patient 8 Overall yearly cost of greater than $300,000,000 2-3, 8 1. 2. Bozic KJ, et.al. The epidemiology of revision total knee arthroplasty in the United States. Clin Orthop Relat Res. 2010;468:45-51. Phillips JE, et.al.. The incidence of deep prosthetic infections in a specialist orthopaedic hospital: a 15-year prospective survey. J Bone Joint Surg Br. 2006;88:943-8. Della Valle CJ, et.al. PE. Periprosthetic sepsis. Clin Orthop Relat Res. 2004;420:26-31. Wilson, M. G.; et.al.. Infection as a complication of total knee-replacement arthroplasty. Risk factors and treatment in sixty-seven cases. J. Bone and Joint Surg., 12-A: 878-883, July 1990 Poss, R.; et.al.. Factors influencing the incidence and outcome of infection following total joint arthroplasty. Clin. Orthop., 182:117- 126,1984. England, S. P.; et.al.. Total knee arthroplasty in diabetes mellitus. Clin. Orthop., 260: 130-134,1990. Papagelopoulos, P, et.al.. Long term outcome and survivorship analysis of primary total knee arthroplasty in patients with diabetes mellitus. Clin. Orthop., 330:124-132,1996. Maderazo, E. G.; et.al. Late infections of total joint prostheses. A review and recommendations for prevention. Clin. Orthop., 229:131- 142,1988 3. 4. 5. 6. 7. 8.

  4. Background Erythrocyte Sedimentation Rate (ESR) & C-Reactive Protein (CRP) Simple, inexpensive, readily available, and accurate Measures of the Acute Phase Reaction Diagnosis of PJI Treatment of PJI by following the trends ESR/CRP in combination are effective tools for helping diagnose PJI Postop elevated levels of ESR/CRP are predictors of PJI 9-11 Normal trends of ESR/CRP following THA/TKA are well-studied 9. 10. Greidanus NV, et.al.. Use of erythrocyte sedimentation rate and C-reactive protein level to diagnose infection before revision total knee arthroplasty. A prospective evaluation. J Bone Joint Surg Am. 2007;89:1409-16. 11. Parvizi J, et.al.. Diagnosis of infected total knee: findings of a multicenter database. Clin Orthop Relat Res. 2008;466:2628-33.. Della Valle C, et.al.. Preoperative testing for sepsis before revision total knee arthroplasty. J Arthroplasty. 2007;22(6 Suppl. 2):90-3.

  5. Background Erythrocyte Sedimentation Rate (ESR) 12-13 Peaks on post-op day 5 Returns to normal at 7-9 months with TKA C-Reactive Protein (CRP) 14-15 Peaks on post-op day 2 Returns to normal by 3-4 weeks with TKA Remains WNL for aseptic loosening 16 ESR/CRP nonspecific for PJI, and can be elevated in a number of other medical conditions 17 12. Park KK, et.al: Normative Temporal Values of CRP and ESR in Unilateral and Staged Bilateral TKA. Clin Orthop Relat Res. 2008 Jan;466(1):179-88. Epub 2008 Jan 3. 13. Bilgen O, et.al..: C-reactive protein values and erythrocyte sedimentation rates after total hip and total knee arthroplasty. J Int Med Res. 2001 Jan-Feb;29(1):7-12 14. Larsson S, et.al..: C-reactive protein (CRP) levels after elective orthopedic surgery. Clin Orthop Relat Res. 1992 Feb;(275):237-42. 15. Niskanen, R. O, et.al., H.: Serum C-reactive protein levels after total hip and knee arthroplasty. J. Bone and Joint Surg., 78-B(3): 431- 433,1996. 16. Shih, L.-Y., et.al.: Erythrocyte sedimentation rate and C-reactive protein values in patients with total hip arthroplasty. Clin. Orthop., 225:238- 246,1987. 17. Nielen M, et.al.. Increased levels of C-reactive protein in serum from blood donors before the onset of rheumatoid arthritis. Arthritis & Rheumatology. 2004; 50: 2423 2427

  6. Background Sensitivity for PJI 18-19 Elevated ESR .82 Elevated CRP .96 Excellent Negative Predictive Value when both are WNL Combination of ESR/CRP shown to be a cost-effective screening protocol for diagnosis of PJI 20 Similar findings of the usefulness of combined ESR and CRP in the setting of PJI following TKA or THA have been reported 21-22 18. Spangehl MJ, et. al.. Prospective analysis of preoperative and intraoperative investigations for the diagnosis of infection at the sites of two hundred and two revision total hip arthroplasties. J Bone Joint Surg Am. 1999 May;81(5):672-83 19. Greidanus NV, et. al.. Use of erythrocyte sedimentation rate and C-reactive protein level to diagnose infection before revision total knee arthroplasty. A prospective evaluation. J Bone Joint Surg Am. 2007 Jul;89(7):1409-16. 20. Austin MS, et. al. .: A simple, cost-effective screening protocol to rule out periprosthetic infection. J Arthroplasty. 2008 Jan; 23(1):65-8 21. Bernard L, et. al.: Value of preoperative investigations in diagnosing prosthetic joint infection: retrospective cohort study and literature review. Scand J Infect Dis. 2004;36(6-7):410-6. 22. Schinsky M, Della Valle C. Perioperative testing for joint infection in patients undergoing revision total hip arthroplasty. J Bone Joint Surg Am. 2008; 90: 1869 1875.

  7. Background Normal Range of ESR 23-24 Patient < 50 yrs Males < 15 mm/hr Females < 25 mm/hr Patient > 50 yrs Males < 20 mm/hr Females < 30mm/hr Normal Range of CRP 25 CRP < 8.2mg/L 23. Caswell M. Effect of patient age on tests of the acute-phase response. Arch Pathol Lab Med 1993;117:906 909 24. Bottinger LE, et. al. Normal erythrocyte sedimentation rate and age. Br Med J. 1967 Apr 8;2(5544):85-7 25. Shine B, et. al.. Solid-Phase Radioimmunoassays for C-reactive protein. Clin. Chim. Acta. 1981; 117:13 23.

  8. Background However, patients undergoing Total Knee Arthroplasty have other comorbid medical conditions that may affect ESR/CRP Urinary Tract Infection 26 Rheumatoid Arthritis 27 Hepatitis-C 28 Crohn s Disease 29 Systemic Lupus Erythematosis 30 Psoriasis 31 Obesity 32 26. Rohrmann S, et. al. Serum C-reactive protein concentration and lower urinary tract symptoms in older men in the Third National Health and Nutrition Examination Survey (NHANES III). The Prostate. 2005; 62: 27 33. Nielen M, et. al.. Increased levels of C-reactive protein in serum from blood donors before the onset of rheumatoid arthritis. Arthritis & Rheumatology. 2004; 50: 2423 2427. Salter M, et. al.. Correlates of Elevated Interleukin-6 and C-Reactive Protein in Persons With or at High Risk for HCV and HIV Infections. Journal of Acquired Immune Deficiency Syndromes. 2013; 24: 488 495. Fagan E, et. al.. Serum levels of C-reactive protein in Crohn's disease and ulcerative colitis. European Journal of Clinical Investigation. 1982; 12: 351 359. Borg E, et. al. C-reactive protein levels during disease exacerbations and infections in systemic lupus erythematosus: a prospective longitudinal study. The Journal of Rheumatology. 1990; 17: 1642 1648 Stern, S. H.; et. al.. Total knee arthroplasty in patients with psoriasis. Clin. Orthop., 248:108-111,1989. Wilson, M. Get. Al.. Infection as a complication of total knee-replacement arthroplasty. Risk factors and treatment in sixty-seven cases. J. Bone and Joint Surg., 12-A: 878-883, July 1990 27. 28. 29. 30. 31. 32.

  9. Background Little data exists on interpretation of preoperative Elevated ESR/CRP No data exists on how to interpret postoperatively elevated ESR/CRP levels in the setting of preoperative elevation

  10. Study Purpose Primary Define the prevalence of preoperatively elevated ESR and CRP within a cohort of healthy patients undergoing primary Total Knee Arthroplasty Secondary Define any comorbidities that may contribute to preoperatively elevated ESR and CRP

  11. Materials & Methods Retrospective chart review of patients who underwent Primary TKA with one surgeon between October 2009 May 2011 Demographics Including Age Gender BMI Medical Comorbidities Pre-Op Lab Values Recorded CRP ESR WBC

  12. Materials & Methods Overall Cohort Inclusion Criteria Total Knee Arthroplasty from October 2007 May 2011 Pre-Op Labs Within 30 Days of Procedure WBC/ESR/CRP At Least Six Months of Follow-Up 94 Patients Idiopathic Cohort Exclusion Criteria Previous Arthroplasty Performed Pre-Op Infection/UTI Chronic Inflammatory Process 78 Patients

  13. Results Overall Cohort Elevated ESR 41.5% (31/94) Elevated CRP 28.7% (27/94) Idiopathic Cohort Elevated ESR 38.5% (30/78) Elevated CRP 26.9% (21/78)

  14. Comparison of Overall Cohort and Idiopathic Cohort of Elevated ESR/CRP by Percent vs BMI (kg/m2) Patients with BMI of 18.5 24.9 0% Elevated ESR 0% Elevated CRP Patients with BMI of 25 29.9 23.5% Elevated ESR 11.8% Elevated CRP Patients with BMI of 30 39.9 36 % Elevated ESR 19.5% Elevated CRP Patients with BMI > 40 64.7% Elevated ESR 64.7% Elevated CRP

  15. Comparison in Idiopathic Cohort of BMI Classification to Mean ESR and CRP

  16. Conclusions Significant number of otherwise healthy patients undergoing TKA with idiopathically elevated ESR/CRP Elevated ESR 38.5% Elevated CRP 26.9% It is inappropriate to assume that an otherwise healthy patient has a normal ESR/CRP prior to undergoing primary joint arthroplasty

  17. Conclusions Direct correlation between BMI category and ESR/CRP Preoperatively, as patient s BMI category increases, one should assume that their ESR/CRP levels are likely elevated Patients with BMI of 18.5 24.9 kg/m2 0% Elevated ESR 0% Elevated CRP Patients with BMI of 25 29.9 kg/m2 23.5% Elevated ESR 11.8% Elevated CRP Patients with BMI of 30 39.9 kg/m2 36 % Elevated ESR 19.5% Elevated CRP Patients with BMI > 40 kg/m2 64.7% Elevated ESR 64.7% Elevated CRP

  18. Conclusions As BMI category increases, so to does the mean of both elevated ESR/CRP as well as the mean of normal ESR/CRP If periprosthetic infection is present, what threshold ESR/CRP levels in different BMI classes should be used to determine infection clearance and timeliness of arthroplasty re-implantation? Suggests that large scale prospective studies should be performed to determine more accurate BMI category-specific normal reference ranges for ESR/CRP

  19. Conclusions Until the results of this study are validated or refuted with large scale trials, one should consider attaining preoperative ESR/CRP values on all patients undergoing joint arthroplasty Cheap & Readily available May help put elevated post-op ESR/CRP values into perspective in a patient with a painful arthroplasty Do these elevated values represent true periprosthetic infection? Are these lab values being interpreted as elevated when in fact they are WNL with respect to the patient s BMI?

  20. Acknowledgments Vinod Dasa, MD Louisiana State University Health Sciences Center Department of Orthopaedic Surgery Ochsner Medical Center Kenner

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