sorry to hear this , but moderation is the key... heavy weights are great when you're in your 20's to early 30's but as you age it's better to decrease the weights and increase the reps[in my humble opinion]it took me 6 hip replacements to learn this valuable lesson... hope you get better soon.
Hope your hips are good now. I would imagine it's never the same. I look at Ronnie Coleman, Paul Anderson, Grimek, and even Clarence Bass had either hip replacement or worn out hips. I hardly ever hear about this in the running community. I would think with all the miles and pounding the pavement it would be a common problem but it's not. Maybe our joints weren't meant to lift heavy weights in advancing years?
I remember Wilf Sylvester the British bodybuilding champion who won the short class Universe in 1975 I believe had a unique method for training legs that year. He used leg extensions and leg curls. What was unusual is that he used body weight squats. No bar. He said he worked up to 400 reps. I don't know if it was for one set or a couple. He said it worked as good as squats with a barbell for him. Maybe for bad shoulders various bench movements for chest should be variations of push ups for me now. Who knows, my chest might get better?
Any way I remember reading an article by Eddie Guiliani how an older guy should train. He said high reps like you said. He also said to have short rests between sets so a light weight becomes heavy. I have also heard other guys use a similar phrasing. "Make a light weight heavy." I think doing sets of 10 to even 15 reps with short rests in between with smooth cadence could go a long way to preserving joints I speculate.