My right arm is weaker than I thought - he had me sit on the exam table, and, keeping my elbows at my side, spread my arms, palm down, making fists. He then pushed my hands up and in, telling me to resist as hard as I could.
He couldn't budge my left hand. My right hand gave him no resistance at all.
My x-ray showed nothing. I'm going in for an MRI next Thursday. He seems to suspect the rotator cuff, but won't say anything for sure until after the results come in.