Prostheses are typically used to replace parts lost by injury (traumatic) or missing from birth (congenital) or to supplement defective body parts.
pɹˈɑːsθəsˌiːz ɑːɹ tˈɪpɪkli jˈuːzd tə ɹᵻplˈeɪs pˈɑːɹts lˈɔst baɪ ˈɪndʒɚɹi tɹɔːmˈæɾɪk ɔːɹ mˈɪsɪŋ fɹʌm bˈɜːθ kəndʒˈɛnɪɾəl ɔːɹ tə sˈʌplɪmənt dᵻfˈɛktɪv bˈɑːdi pˈɑːɹts.