Is the lab useful to distinguish septic arthritis versus transient synovitis
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Is the lab useful to distinguish Septic Arthritis versus Transient Synovitis? PowerPoint PPT Presentation


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Is the lab useful to distinguish Septic Arthritis versus Transient Synovitis?. Laboratory rounds Jan 30, 2003 Rob Hall PGY3. 3yo Refuses to weight bear on left hip No hx of trauma or fever URTI recently T 38.0 Painful ROM right hip Kid looks well. What is your differential?

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Is the lab useful to distinguish Septic Arthritis versus Transient Synovitis?

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Is the lab useful to distinguish septic arthritis versus transient synovitis

Is the lab useful to distinguish Septic Arthritis versus Transient Synovitis?

Laboratory rounds

Jan 30, 2003

Rob Hall PGY3


Is the lab useful to distinguish septic arthritis versus transient synovitis

3yo

Refuses to weight bear on left hip

No hx of trauma or fever

URTI recently

T 38.0

Painful ROM right hip

Kid looks well

What is your differential?

What tests would you order?

How useful are your tests going to be?

Case


Differential of limp

Differential of Limp

  • Trauma

    • fracture, sprain, strain, contusion, abuse

  • Infection

    • Septic arthritis, osteomyelitis, cellulitis, fascitis, myositis

  • Inflammation

    • Toxic synovitis, JRA, HSP, serum sickness, rheumatic fever

  • Other

    • AVN, SCFE, tumor, leukemia, sickle cell


Are a wbc esr or crp useful for distinguishing septic arthritis vs transient synovitis

Are a wbc, ESR, or CRP useful for distinguishing septic arthritis vs transient synovitis?

  • Small retrospective studies with poor design

    • Molteni 1978

    • McCarthy1980

  • Potentially meaningful studies

    • Kunnamo 1987

    • Del Beccaro 1992

    • Kocher 1999


Kunnamo 1987 american journal of the diseased child

Kunnamo 1987American Journal of the Diseased Child

  • Prospective study of all kids referred to a tertiary pediatric referral center with arthritis

  • N = 278, only 18 with septic arthritis

  • Gold standard was based on follow up if joint not tapped and no follow up data given


Kunnamo 1987 american journal of the diseased child1

Kunnamo 1987American Journal of the Diseased Child

  • Variable Sensitivity Specificity

    • CRP > 20 94% 92%

    • ESR > 20 94% 68%

    • WBC > 12 59% 95%

    • T > 38.5 77% 95%

    • T>38.5 or 100% 87% CRP >20


Kunnamo 1987 american journal of the diseased child2

Kunnamo 1987American Journal of the Diseased Child

  • Small study

  • Method problems

  • Wide confidence intervals

    • CRP > 20: sensitivity 94% (95%CI 72 – 99%)

  • Doesn’t answer the question


Del beccaro 1992 annals of emergency medicine

Del Beccaro 1992Annals of Emergency Medicine

  • Retrospective chart review

  • Method problems

  • N = 132

    • Septic arthritis 38

    • Transient synovitis 94

  • Gold standard problems

    • Transient synovitis defined based on clinical course but 13% lost to follow up


Del beccaro 1992 annals of emergency medicine1

Del Beccaro 1992Annals of Emergency Medicine

  • Statistically significant differences

    • Variable Septic Arthritis Transient synovitis

    • Temp38.137.2

    • ESR 4419

    • WBC13.211.2


Del beccaro 1992 annals of emergency medicine2

Del Beccaro 1992Annals of Emergency Medicine


Del beccaro 1992 annals of emergency medicine3

Del Beccaro 1992Annals of Emergency Medicine

  • Wide confidence intervals

  • Huge overlap between groups with each variable

  • How can we use this information?

    • ESR, CBC, temp not that helpful in isolation

    • Combinations may be useful


Kocher 1999 journal of bone and joint surgery

Kocher 1999Journal of Bone and Joint Surgery

  • Retrospective chart review of 282 patients

  • Same metholodogical problems

  • Found statistical differences b/w septic arthritis and transient synovitis for……

    • Hx of fever

    • Ability to weight bear

    • Joint effusion on Xray

    • Temp

    • ESR

    • WBC


Kocher 1999 journal of bone and joint surgery1

Kocher 1999Journal of Bone and Joint Surgery

  • Multivariant analysis found four predictors of septic arthritis

    • History of fever

    • Non-weight bearing

    • ESR > 40

    • WBC > 12

  • Developed an algorithm based on above 4 variables


Kocher 1999 journal of bone and joint surgery2

Kocher 1999Journal of Bone and Joint Surgery


Kocher 1999 journal of bone and joint surgery3

Kocher 1999Journal of Bone and Joint Surgery

  • This is NOT a validated prediction rule

  • Again suggests that combination of information is useful


Approach to the irritable hip

Approach to the Irritable Hip


Surprise the lab alone is not the answer

Surprise! The lab alone is NOT the answer…………


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