The differences appear to be straight forward in that internal hex implant
has the hex component internal to the implant, that is, it is a female type
hex receptacle, if you would, and the external hex implant has an external
hex component, that is, like a hex nut.
Pictures are supposed to speak louder than words, so please look at page 27
of this PDF file on the MIS Implants website for an example of an internal
Note that you do not see the hex component on the exterior of the implant,
but rather only a smooth round collar at the top of the implant. The hex
component is internal to the implant, as seen from the above view on the
To compare and contrast, please look at page 28 of this PDF file, also on
the MIS Implants wensite, for an example of an external hex implant.
Note that above the thin round collar at the top of the implant is the hex
component of the implant, and external to the implant.
To visualize this further, one would have to use a male hex tool (think
hex driver) to tighten or loosen an internal hex implant, and use a female
hex tool (think hex socket) to tighten or loosen an external hex implant.
If you need any clarification, please feel free to ask.
Looking Forward, denco-ga - Google Answers Researcher