MARS MRI is sensitive and specific for the diagnosis of periprosthetic hip joint infection (PJI) – new study published in the journal Radiology.

Julien Galley, Reto Sutter, Christoph Stern, Lukas Filli, Stefan Rahm, Christian W. A. Pfirrmann

Editorial by Marco Zanetti: The Expanding Role of MRI in the Evaluation of Periprosthetic Hip Joint Infection


Imaging is still not part of the 2018 PJI diagnostic criteria of the Musculoskeletal Infection Society – with these new results MARS MRI will play an important role in the management of PJI.

Periosteal reaction, capsule edema and intramuscular edema are sensitive and specific for PJI of the hip. Of note – periprosthetic osteolysis and bone marrow edema do not differentiate. 

  • The sensitivity and specificity of periosteal reaction for PJI were 78% and 90%, respectively.
  • The sensitivity and specificity of capsule edema for PJI were 83% and 95%, respectively.
  • The sensitivity and specificity of intramuscular edema for PJI were 95% and 86%, respectively.

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