This definition appears rarely
See other definitions of PPU
Samples in periodicals archive:
A--A natural hydrostatic phenomenon, at the level of the ends of the plantar arcs, diffuses body weight, as PAIN plays the role of outsentry (fig. --1) (5); B--Plantar perforating ulceration.
(KudoZ) Romanian to English translation of mal perforant plantar: perforating foot ulceration [Medical: Health Care (Medical)].