These termite infested wood posts are approximately 37 years old as the home was built in 1971. The patio/deck posts were connected to the foundation with less structurally sound "architectural style" post to footing brackets. Those brackets are hidden from view from the exterior. They are internal in the posts and place the posts directly on the concrete. The problem with placing the wood posts directly on the concrete slab is that the wood posts may get wet and termites love wet wood.
Descriptions of the repair work to replace the terminte infested wood posts can be seen at this web site: