Didn't read the whole thing but I noticed the hip replacement comment.
You need to call the doc that replaced your hips and tell him what happened. If it's not the same doc, call one of them.
I'm a nurse in the OR and one of the worst things I see is when a total joint gets injured. It goes from injury, to revision, to infection, to replacement, and every step along the way is bone and muscle trauma. It takes a long time to recover and some folks never quite do.
Everything else looks superficial. Pavement plus sand isn't solvable with tires. You needed to ride it out and take the turn once the sand ended. Doesn't matter, just call your doc.