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Pediatr Radiol. 1999 Aug;29(8):617-23.

Power Doppler evaluation of joint effusions: investigation in a rabbit model.

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1
Division of Pediatric Radiology, C. S. Mott Children's Hospital, University of Michigan Medical Center, 1500 East Medical Center Drive, Ann Arbor, MI 48109-0252, USA.

Abstract

OBJECTIVE:

To study the power Doppler findings of septic arthritis and noninfectious synovitis in an animal model.

MATERIALS AND METHODS:

The right knees of 10 rabbits were inoculated with an aqueous suspension of Staphylococcus aureus. The right knees of 5 rabbits were injected with talc suspension. The right knees of 5 rabbits were injected with saline. All 20 left knees were injected with saline. Serial power Doppler images were obtained using constant-imaging parameters. Images were reviewed by blinded observers who assessed for increased power Doppler signal.

RESULTS:

All 10 knees inoculated with S. aureus developed septic arthritis. Each infected rabbit knee demonstrated increased signal on power Doppler on at least one examination, ranging from 1-6 days after inoculation. Only 23 of 45 examinations of infected knees were unequivocally positive by power Doppler on examinations performed 1 to 6 days after inoculation. No knee with talc synovitis demonstrated increased power Doppler signal. No control knee demonstrated increased power Doppler signal.

CONCLUSION:

Increased power Doppler signal may be seen with septic arthritis; however, its intensity and timing may vary from subject to subject. A normal power Doppler examination does not exclude septic arthritis.

PMID:
10415191
DOI:
10.1007/s002470050662
[Indexed for MEDLINE]
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