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tibiofibular crests

While I was adding to my character list for my upcoming coelurosaur
analysis, I came across the synapomorphy of a tibiofibular crest.  I noticed
this is homologous to the ectocondylar tuber.  Can anyone tell me when an
ectocondylar tuber becomes a tibiofibular crest?  What is the characteristic
that distinguishes them?  Thanks in advance.

Mickey Mortimer