The story in these drawings is about advanced disease, or chronic disease. The day will probably not come that no horse will experience founder (for those that do this is important work), but each day more people are becoming familiar with the early signs of laminitis, reacting appropriately, and fewer horses are foundering.
I am working on these drawings with some reluctance. The story these drawings tell is a very different story from the one this page is about. I'm using this short trip through founder/resection to highlight the importance of avoiding it.
When PIII is allowed to rotate the laminae stretch, die, and become hard. This is the lamellar wedge. In order to restore health to the hoof capsule PIII must be replaced to it's pre-rotation position. The wedge occupies the space where PIII should be. So, the wedge has got to go.
After the lamellar wedge has been removed PIII can be restored to It's pre-founder position.
If the tissues that produce new growth are still healthy, horn and laminae should begin to grow normally or near normally (this is a big topic and here is not the place to get into it).