The Adventure of Shoscombe Old Place (1927)
The Final Problem (2017)
(the gifs belong to @smoljohnlock )
This John slept on all his anatomy lessons. Bones are one of the first things you learn to identify in med school (because they are the easiest structures to identify) and it's a tibia, not a bloody carpal bone.
And I think Sherlock has a overestimated idea of how good John is, because the John in his drug trip can break every bone while naming it and this one can't even say the name of the bone in front of him. Or something is fishy because this would be really out of character (like ridiculously out of character, like all the series).