I had a minor but painful back injury in my 40s and a severe knee injury in my mid-50s. I am now 81 and still have to do the exercises for both. It's a life-long PT program! Let it go and you risk re-injuring the affected part! The previously injured part will always need the support of your muscles.
May your trails be crooked, winding, lonesome, dangerous, leading to the most amazing view--E. Abbey