Radiotherapy after a hip replacement and with historic urinary issues

I am 71 and recently diagnosed with prostate cancer.  My Gleason score was 3+4 and I’m Prognostic Grade Group 2 , possibly T stage 3A.   The surgeon suggested that radiotherapy might not be a good option as I have a metal hip and also a history of urinary/bladder problems (e.g. frequent urinating, leaking a little before and after, not emptying my bladder fully sometimes).  The oncologist thought that the hip replacement was not a concern, it would only be if I’d had both hips done. He didn’t see any additional risks to other organs around the prostate.  But he did think there is a risk of radiotherapy making my continence problems worse.  However no one has been able to say how likely that is to be say a little worse, much worse or very significantly worse.  And so no one is able to say what I would have to do if things were a little, much and very significantly worse.  No one has been able to say how likely these three scenarios are.  I currently wear pads and that’s no problem for me.  I’ve also been unable to find any studies looking at this issue.  I think this is likely to be the crucial issue in my choice of treatment, but I’m struggling to make an informed decision.  I’d appreciate any thoughts or experiences.