Posted 9/25/2019 12:40 PM (GMT -5)
Prostate surgery is a significant risk factor for Peyronie's Disease but, as far as I am aware, radiation for prostate cancer is not. I did some Googling and the relationship between radiation and Peyronie's in the research seems to center on radiation as a (not-very-good) treatment for PD.
As for whether your contracture was the cause of your so-so erections, anything is possible but it's more likely that causation runs the other way. Peyronie's is caused by minor (often unnoticed) injuries to the penis that form unfortunate scars. That sort of injury is often caused by the bending of an imperfectly erect member. That may explain, in part, why prostate surgery is a risk factor for PD. We surgery guys spend quite a bit of time making do with a damaged (but hopefully recovering) erectile response.
But, where the problem came from is not that important. The important thing is that it's treatable. Be sure your urologist knows what is going on and be proactive about seeking treatment.