I had surgery in May to repair a torn rotator cuff. I injured myself in a fall last summer. It took me a while to clue in that something was really wrong (I had also injured ribs and my collarbone so the shoulder was the least painful thing). I didn't have a complete tear...partial, about 75% torn...but I was continuing to irritate it in yoga class and such. I didn't have pain at rest either. It really only hurt after yoga or pilates class...anything plank/push-up-related made me really sore. And I noticed weakness when doing things like pulling wet laundry out of the washer or taking a full gallon of milk out of the fridge.