I think you want to treat the first six months as recuperation time. You'll have the rest of your life to dive, you need to heal the hip during this time.
It's not just lifting the weight, but any movements that put undue pressure on the implant.
Remember a few things:
- You're having major surgery on your bones.
- Your muscles will have been put under major stress or been surgically modified.
- Your body will be trying to integrate a beneficial, but foreign object into your frame.
Think about it this way: If you just glued two things together, you would wait to make sure they set properly before you put pressure on them. If you didn't, you would not be surprised if they didn't hold and you needed to glue them again.
In our case, it's the same principle. The implant has to anneal itself to the bone. In the case of the femur, it may be aided by glue or not. In the case of the hip bone, glue is not usually used. The glue in this case is our natural bone growth into the implant, which takes time.
Over time, the bone sets and grows stronger and stronger. By the time six months have elapsed, they are very strong. But if you put too much pressure on too early, you may have issues, the worst of which would be a revision which most likely would mean a THR.
So I would ease into things and really pay attention to what's important, let it heal so you can go back to diving with abandon.