Man you've had some pretty bad injuries! Hope everything's OK now.
I haven't heard of hip pulls before i got mine. The board probably over rotates my lower body while my upper body is still , pulling the hip. the weird thing is it's only my right hip that gets pulled.
Anyhow I'm taking a couple of weeks off and working them out and stretching, so hopefully it doesn't happen again. And I got those impact pants last night - We'll see how that works out!