Upper deltoid works, Lower deltoid or post-terior doesn't

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Upper deltoid works, Lower deltoid or post-terior doesn't

Hello everyone. I was in a motorcycle accident about 7 months ago. Initially, I couldn't move my arm in two directions (no deltoid or superscapular muscle working). After two months, the rotator cuff muscles came back and I could raise my arm again. At about 6 months the upper deltoid started to come back. However, the lower deltoid hasn't come back yet. So, I can't reach my arm backwards or to the side when I spin my wrist to face outwards. The doctor said that I have one week to decide if I want to have surgery. I am leaning towards "no" at this point because he stated that the chance of recovery is 60% and it could be worse than now. Any comments would be appreciated. I am a 28 year old male and I hope to play softball again. thank you.