Hi, Thank you for providing the brief history of you. As you mentioned you had an injury 7 years ago and for which you under went a surgery. Now, since you have a pain in your mid back region , I will suggest you to take some ultrasound therapy via the physical therapist. Also you need to do regular breathing exercises, As breathing exercise is not only going to move the rib cage but also the thoracic vertebrae as well. As your spinal is ok, may be your physician must have told you this, we need to look for the exercise rehabilitation which can help ease the pain. As you should know that the thoracic vertebrae which is your mid back region, this vertebrae do not have much movements except for a few degree of movement. You must be having a paraspinal muscle spasm which can be helped with ultrasound therapy, Physical therapist will perform this. Post that a rehabilitation plan to be implemented in two formats 1. short term goals 2. long term goals. Short term goals, Reduce the pain improve respiration increase strength in upper and lower limbs Long term goals Focus on core stability Improve shoulder girdle muscles Strengthen the spinal muscles On the long term goals, You need to keep practicing this exercises as you should always safe guard your spine. Due to the injury of the past, The physics of the load bearing spine has been modified. So a proper care is always a good way to good health I hope to see you cheerful soon Regards Jay Indravadan Patel