hi sheri sorry it took me a bit to get back to you. been on the go!
i am certain you can google for a more "medical" explanation but in lay terms when i had my frozen shoulder it was in three stages that take about a year to go through all together!
i recall there are 3 stages and forgive my lapse in memory but like child birth i have put it behind me. it is much worse than basic arthitis in the shoulder. for unknown reasons scar tissue called adhesions form around the shoulder and make it impossible to move. the scar tissue actually has to be broken through to gain movement but you can not work on that until the inflammation has gone down. i still recall being bumped when leaving a book store and hearing and feeling the scar tissue rip in my shoulder which was great because it gave me some movement. this is so painful and you can not fed yourself, dress yourself, or move that arm for most any function when it is frozen. eventually the pain goes away and all motion comes back. i can do everything but wave at this point and even that is getting better! some people have surgery to improve this condition- i did not as it is not 100% certain to be successful i was told. good luck and sorry i have blocked so much of it out of my mind- but it was to painful to remember.