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Hi @Bob57 as @jumpinjeff asked options depend on what arm is immobilized. In either case I bet there are ways to continue although with a change of technique. For strumming picking an electric guitar maybe best as it doesn’t extend the joint much. You can try practicing strumming now using only your wrist – no shoulder movement same with finger picking. For the fretting hand it may help to stabilize the guitar so you don’t have to support the neck and go easy with the fretting. If playing is not possible it might be a great time to really work on listening and visualizing how different sounds are made.
Anyway stay engaged the break maybe a way to reignite your passion for guitar! 👍