The terms "prosthetic" and "orthotic" are adjectives used to describe devices such as a prosthetic knee.
ðə tˈɜːmz "pɹəsθˈɛɾɪk" ænd "ɔːɹθˈɑːɾɪk" ɑːɹ ˈædʒɪktˌɪvz jˈuːzd tə dᵻskɹˈaɪb dɪvˈaɪsᵻz sˈʌtʃ ɐz ɐ pɹəsθˈɛɾɪk nˈiː.