Patient Case: Hematoma, or A Fractured Patella?

Doctors use Sermo to collectively solve challenging patient cases and get help with diagnoses. Sometimes doctors just need a second opinion for family members or friends, and look to their peers for support. An ophthalmologist in the US recently posted:

My sister fell while walking the dogs yesterday.  She rapidly developed a large swelling over her patella. She says it is kind of purplish and fairly firm but not rock hard. It is mechanically preventing her from straightening her leg but she can walk. She denies numbness or paresthesia of the leg below the knee and can move her foot normally. As of last night the hemorrhage had not migrated around to the backside of the knee.

To me this just looks like a whalloping hematoma. Does she need to be worried about anything? Any useful treatment?

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