Appearance of septic hip prostheses on plain radiographs.
OBJECTIVE
The purpose of this study was to evaluate the spectrum of plain radiographic findings in patients with septic hip prostheses.


METHODS
Radiographs of 20 confirmed infected hip prostheses were examined for the presence or absence of lucency, type of lucency (focal or nonfocal), rapidity of radiographic change, periostitis, subsidence, and cement fracture.


RESULTS
Findings were normal in 10 prostheses, but nonfocal lucencies mimicking mechanical loosening were seen in four cases. Two cases showed focal bone loss, indistinguishable from aggressive granulomatosis. A variety of findings, including subsidence and periostitis, were seen in the remaining four prostheses.


CONCLUSIONS
Plain radiographs of septic hip prostheses often show normal findings but can show focal bone loss that mimics aggressive granulomatosis.
Department of Radiology, Emory Clinic, Emory University School of Medicine, Atlanta, GA 30322.
S
S
Tigges
R G
RG
Stiles
J R
JR
Roberson
D006615:Hip / Q000000981:diagnostic imaging; D006621:Hip Joint / Q000000981:diagnostic imaging; D006622:Hip Prosthesis / Q000009:adverse effects*; D006801:Humans; D016459:Prosthesis-Related Infections / Q000000981:diagnostic imaging*; D011859:Radiography; D013203:Staphylococcal Infections / Q000000981:diagnostic imaging*; D013212:Staphylococcus epidermidis