A prosthetic ankle assembly comprising a first prosthetic ankle component and a second prosthetic ankle component, the first prosthetic ankle component comprising: a first bearing surface configured to slidably engage a second bearing surface of the second prosthetic ankle component when the first and second prosthetic ankle components are in an installed configuration; and one or more protrusions protruding from the first bearing surface, the protrusions being configured to be received by one or more corresponding receiving portions provided on the second prosthetic ankle component, wherein the one or more protrusions are further configured such that the interaction with the receiving portions permits the first and second prosthetic ankle components to slide with respect to one another in an interface plane defined by the interface between the first and second bearing surfaces, and wherein the protrusions are further configured to restrict the first and second prosthetic ankle components moving away from one another in a direction with a component perpendicular to the interface plane; wherein the one or more receiving portions are in the form of a slot provided in the second bearing surface of the second prosthetic ankle component; wherein an opening to the slot is provided in an end wall of the second prosthetic ankle component, the opening being arranged to receive a corresponding protrusion during assembly of the first and second prosthetic ankle components; wherein the first prosthetic ankle component further comprises a lip, the lip being provided at or towards an edge of the first bearing surface, the lip being configured to limit sliding movement of the first and second prosthetic ankle components. a first bearing surface configured to slidably engage a second bearing surface of the second prosthetic ankle component when the first and second prosthetic ankle components are in an installed configuration; and one or more protrusions protruding from the first bearing surface, the protrusions being configured to be received by one or more corresponding receiving portions provided on the second prosthetic ankle component, wherein the one or more protrusions are further configured such that the interaction with the receiving portions permits the first and second prosthetic ankle components to slide with respect to one another in an interface plane defined by the interface between the first and second bearing surfaces, and wherein the protrusions are further configured to restrict the first and second prosthetic ankle components moving away from one another in a direction with a component perpendicular to the interface plane; wherein the one or more receiving portions are in the form of a slot provided in the second bearing surface of the second prosthetic ankle component; wherein an opening to the slot is provided in an end wall of the second prosthetic ankle component, the opening being arranged to receive a corresponding protrusion during assembly of the first and second prosthetic ankle components; wherein the first prosthetic ankle component further comprises a lip, the lip being provided at or towards an edge of the first bearing surface, the lip being configured to limit sliding movement of the first and second prosthetic ankle components.