An acetabular implant for use in a hip joint prosthesis is disclosed. The housing unit includes first and second housings coupled together. In one embodiment, machine data is turned into a machine data web by organizing machine data into events and then linking events together. At least a portion of the free end of the blade has an increased width such that the blade is locked within the slot of the fastener when torque is applied to the driver bit. One of the first and second electrically conductive switch portions of the first proximity switch forms at least a portion of an electrode of the electroluminescent element. , each of which uses an information recording medium with a file thereof managed by a file system.