restless, spasm of shoulder/arm

Hi - Often times after my patients that have separated their shoulder (I am assuming your AC joint in this case) will present with weakness after a period of inactivity of the involved extremity. The musculature which could present with weakness are and are not limited to: rotator cuff muscles, rhomboids, deltoids, biceps etc. Often times they may also test strong but don't have the strength/endurance required for increase activity level after the injury. I would also find trigger points in those muscles as well which need to be addressed. This involves performing techniques involving myofascial release or dry needling to release the trigger points. The weakness and trigger points could contribute to inefficient use of the muscle or muscle group and after increase activity level could contribute to "spasms and twitches". Without physically examining you this is what first came to my mind. I hope this helps.