Fear muscle detaching from sternum. Or implant displacement? Implant falls to side, painful. How can this be best fixed? (Photo)

I had BA 10 years ago. 10 weeks post op suddenly got dent along sternum and looked like my muscle released more on one side ... Assymetry when lying down & painful. Ok for 10 years. However had trauma to same breast 1 year ago. Pushed down and out... Possible capsule tear. Implants not ruptured. Though now muscle covering breast very painful and keeps retracting upwards along sternum. Worsening. And pain to my arm and down to wrist... What is it? How can it be best fixed? Pocket too big?

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