Knee Effusions - Arthrocentesis Interpretation
Inflammatory ...
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Description

Knee Effusions - Arthrocentesis Interpretation

Inflammatory arthritis:

 • Color: Yellow-> Green

 • Clarity: Opaque

 • Viscosity: Low

 • WBC/mm3: 2000->150,000

 • PMN's: > 50%

 • Mucin clot: Good to poor

 • Culture: Negative

Septic

 • Color: Yellow

 • Clarity: Opaque

 • Viscosity: Variable

 • WBC/mm3: 15,000> 200,000 

 • PMN's: ->75%

 • Mucin clot: poor

 • Culture: Mostly positive

Non-lnfiammatory:

 • Color: Yellow

 • Clarity: Transparent

 • Viscosity: High

 • WBC/mm3: 200> 2000

 • PMN's: < 25%

 • Mucin clot: Good

 • Culture: Negative

OTHERS:

 • Hemarthorosis- Large number of RBC's

Crystal analysis:

 • MSU: Gout

 • CPPD: Pseudogout

Additional DX:

 • Lyme: Serological testing

 • Gonococcal: Identify N gonorrhea via nucleic acid amplification of blood/synovial fluid

 • TB: Synovial membrane histo-anthology and culture

 • Fungal: Fungal stain and culture or synovial membrane histopathology



Dr. Ravi Singh @rav7ks



#Knee #Effusions #Arthrocentesis #Interpretation #diagnosis #septic #joint #fluid #analysis
Contributed by

Dr. Ravi Singh K
@rav7ks
Academic Hospitalist and APD @SinaiBmoreIMRes, Clinical reasoning,Simulation and POCUS enthusiast - https://twitter.com/rav7ks
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