Rotator Cuff/Shoulder question..
One year ago I had a rod put in my arm as I severely fractured by humerus. The rotator cuff was torn in the process (I believe to get the rod in) along with issues in biceps/triceps. Long story short, as I've been working through NLP my right arm has definitely been weaker but getting stronger (for example, it shakes a bit on working benches and presses), but doesn't "hurt". I can do full depth dips without pain as well as squat and deadlift. However, when I do chin-ups, I get a numbness/sharp pain that feels like it runs from behind my shoulder almost to my tricep area. It isn't debilitating by any stretch, but I can definitely feel it for a while after doing sets of chin-ups. What is the likely culprit? I'm thinking rotator cuff, but I am terrible with anatomy. The pain doesn't last that much longer, and I have been gradually getting stronger with chins, so my question is, should I keep doing them despite some pain, or hold off for a while?