Abstract: A lubricated joint assembly comprises joint means received in a boot having cuffs which allow coupling members to connect between the joint means and external mechanisms. The boot cooperates with the coupling members to fully enclose the joint means. The boot is pressurized with a lubricant charged thereto whereby the boot is expanded and compresses the lubricant therein. In the preferred embodiments, the lubricant is charged to the boot in a fashion which displaces all air from the boot, thus preventing oxidation of the lubricant. Further, in the present invention, the external shape of the expanded boot is controlled by controlling the shape of the boot before pressurization thereof and by also controlling the wall thickness of the boot in selected areas thereof.