n mdcn, prsthss (pl.: prsthss; frm ncnt Grk: πρόσθεσις, rmnzd: prósthss, lt. 'ddtn, pplctn, ttchmnt'), r prsthtc mplnt, s n rtfcl dvc tht rplcs mssng bdy prt, whch my b lst thrgh physcl trm, dss, r cndtn prsnt t brth (cngntl dsrdr). Prsthss r ntndd t rstr th nrml fnctns f th mssng bdy prt. prsn wh hs ndrgn n mpttn s smtms rfrrd t s n mpt, hwvr, ths trm my b ffnsv. Rhblttn fr smn wth n mpttn s prmrly crdntd by phystrst s prt f n ntr-dscplnry tm cnsstng f phystrsts, prsthtsts, nrss, physcl thrpsts, nd ccptnl thrpsts. Prsthss cn b crtd by hnd r wth cmptr-dd dsgn (CD), sftwr ntrfc tht hlps crtrs dsgn nd nlyz th crtn wth cmptr-gnrtd 2-D nd 3-D grphcs s wll s nlyss nd ptmztn tls.