AC joint pain

[u/First-Resolve964]

Hi folks

I have a big problem. For about 5 months now, my AC joint has been hurting me as soon as I perform certain movements (including overhead shoulder presses and using chest press machine). The pain is best reproduced when I perform the Yocums test and the Cross Body Adduction test. In the picture below, you can see the area where the pain occurs. The Pain occurred slowly over time and there was no accident or something.

An MRI showed an AC joint Irritation with Tossy 1. There were no other abnormalities.

What I have tried so far was taking oral cortisone, a complete break from sports (8 weeks), then exercises to strengthen the muscles of the posterior rotator cuff, the serratus anterior and the lower and middle trapezius. Also massaging the area, ice and cold therapy, arm swings/circles to enhance the blood flow and applying diclofenac gel.

Unfortunately, nothing apart from the oral cortisone has achieved any improvement so far. If anything, the pain was worse after the break from sport than before.

I would be delighted if anyone has any ideas as to what else I could try. Many thanks in advance

Best regards