I came across this really interesting x-ray of someone with a short metacarpal. It’s only on one hand and the doctors think trauma when the patient was young might have disrupted growing. It is painless and the patient and doctor decided to leave it be.
Source: http://congenitalhand.wustl.edu/2015/04/the-short-4th-metacarpal.html?m=1
thefancywalrus 