Foreign body induced knee synovitis

Case contributed by Dr Maulik S Patel


14 yrs. boy with a history of wood splinter injury to knee about a year ago. 1 surgery and 2 aspirations done so far. MR showing synovitis. Referred for USG to look for any residual wood splinter - foreign body.

Patient Data

Age: 14 years
Gender: Male

XRay - Prominent supra and infrapatellar soft tissue.


Synovitis in suprapatellar region with a foreign body ( 5 mm ) embedded within synovium. A second foreign body ( 10 mm ) posterior to posterior cruciate ligament. A third foreign body ( 15 mm ) posterior to calf vessels.

Foreign body granuma is noted here; abutting vessels. No thrombosis was present.

Popliteal cyst as well as extra-articular collection.  Reactive node in popliteal fossa adjacent to popliteal vessels.


Case Discussion

Fragmentation and migration are major casues for false nevative ultrasound when you are looking for this kind of foreign body.  

Presence of gas in soft tissue can result in false negative or false positive ultrasound finding.

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Case information

rID: 13658
Published: 4th May 2011
Last edited: 9th Jan 2016
Inclusion in quiz mode: Included

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