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Medical image of a 61-year-old male who presented to the emergency department with hip problems 43 months after having a titanium/titanium (Ti/Ti) modular neck-stem total <a href="https://en.wikipedia.org/wiki/Hip_replacement" class="extiw" title="en:Hip replacement">hip arthroplasty</a> (MTHA) (Wright Medical Systems, Arlington, Tennessee). It was diagnosed as aseptic hip <a href="https://en.wikipedia.org/wiki/pneumarthrosis" class="extiw" title="en:pneumarthrosis">pneumarthrosis</a>. This <a href="https://en.wikipedia.org/wiki/CT_scan" class="extiw" title="en:CT scan">CT scan</a> shows extra-capsular gas from a hip <a href="https://en.wikipedia.org/wiki/Pneumarthrosis" class="extiw" title="en:Pneumarthrosis">pneumarthrosis</a> (gas in the joint).
Yoav Morag, Corrie M. Yablon, Alexander E. Weber, Catherine Brandon, David J. Blaha
<cite style="font-style:normal"> (2014). "Aseptic hip pneumarthrosis following modular total hip arthroplasty: a potential mimic of hip infection". <i>Emergency Radiology</i> <b>22</b> (2): 211–214. <a href="https://en.wikipedia.org/wiki/Digital_object_identifier" class="extiw" title="w:Digital object identifier">DOI</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.1007/s10140-014-1286-1">10.1007/s10140-014-1286-1</a>. <a href="https://en.wikipedia.org/wiki/International_Standard_Serial_Number" class="extiw" title="en:International Standard Serial Number">ISSN</a> <a rel="nofollow" class="external text" href="https://www.worldcat.org/issn/1070-3004">1070-3004</a>.</cite>