The medial epicondyle of the femur is a bony protrusion located on the medial side of the bone's distal end. Located above the medial condyle, it bears an elevation, the adductor tubercle, which serves for the attachment of the superficial part, or "tendinous insertion", of the adductor magnus. This tendinous part here forms an intermuscular septum which forms the medial separation between the thigh's flexors and extensors. Behind it, and proximal to the medial condyle is a rough impression which gives origin to the medial head of the Gastrocnemius.
If that sounds like an excerpt from an anatomical textbook, I suspect that's because it is. (I actually copied and pasted it from the opening section of the relevant Wikipedia page.)
On Wikipedia's diagram (extracted from Gray's Anatomy), you have to look quite hard to see the medial epicondyle.
What I'm trying to say here is that this strikes me as a particularly obscure fact to be included in a pub quiz.
On the other hand, someone in the quiz I took part in did know (or at least was able to guess) that it was to be found in the knee. So maybe it's not as obscure as I thought.
The humerus also has a medial epicondyle – hence the allowing of "elbow" as an alternative answer. This one is so insignificant that someone has helpfully included a great big arrow on the Wikipedia diagram!
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