I Am 58yrs Old Weight 56-57kg Very Active Female. I

I am 58yrs old weight 56-57kg very active female. I have been told by 2 hip surgeons that I will need a hip replacement. I only have pain when I ride my horse(ridden professionally all my life), and never do I feel pain directly in my hip, only down the front of thigh and into knee. All other times of day I feel little aches and pains. I do a hard pilattes routine everyday. Is it normal to have pain from hip only in thigh and knee?
No thanks, just got to the bottom and have too pay, Not interested.