ABSTRACT: In his A Conceptual Investigation of Justice, Kyle Johannsen suggests a theory of disability that holds that to have a disability just is to be worse off, sometimes referred to as the ‘medical’ or ‘individual’ model of disability. I argue that Johannsen’s understanding of disability might force some of his key claims into an uncomfortable position. In particular, for his theory to avoid the thrust of Elizabeth Anderson’s criticisms of luck egalitarianism, the assumption of the medical model of disability must be dropped, but this comes at the cost of his criticism of John Rawls’ difference principle. RÉSUMÉ : Dans son livre, A Conceptual Investigation of Justice, Kyle Johannsen semble invoquer une théorie du h...