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The accompanying illustration shows a hand-print of the middle, ring and little fingers of a young man.
Between the metatarso-phalangeal joint and the distal end of the first phalanx of the little finger is what appears to be a joint. The bone is intact, but the tissue creases at this point when the man closes his hand. There are no symptoms and the peculiarity was discovered accidentally.
LAKE GB. A TISSUE JOINT OF THE LITTLE FINGER.. JAMA. 1906;XLVII(26):2158. doi:10.1001/jama.1906.25210260028002