Hi Lee,
Congratulations on you new hip, you can now look forward to being pain free and active.
I have been boxing for many years and mma, I am almost eight month's post op and back to training to 80%, the 20% is made up from not being slammed to the floor from stand up or with some of the guys I train with....no tai kick to the leg, I really do not fancy a full kick on the thigh. That said I was messing with my son in the kitchen and he swiped my leg and I hit the floor hard and I was fine, and that was a hard floor, not matts !!!
I have been stretching from 6-8 weeks, and if you are flexible then you should be able to get back to full flexibility within twelve months, but you need to check with you doctor mate.
I am not a big kicker but I have been able to axe kick to shoulder/head height for some time now, my personal bench march is I can move around the dojo really easily and I spent an hour on the matts today grappling at a good level with some good guys.
I hope have I have helped, good luck with your recovery, keep us posted.
Best wishes
Terry