A method of providing a modular prosthetic socket for a residual limb of a patient may involve receiving digital data defining a three-dimensional digital profile of the residual limb and selecting prosthetic socket components from component-specific inventories, based at least in part on the digital profile. The selected prosthetic socket components may include: multiple longitudinal struts; one or more proximal brim members for attachment to the longitudinal struts; and a distal socket base to which the longitudinal struts attach at or near their distal ends. The method may further involve providing the selected prosthetic components to an operator for assembling into the modular prosthetic socket. The prosthetic socket, when assembled, defines an internal space substantially complementary to the profile of the residual limb.