Slipping Rib Syndrome, or Tietze Syndrome, is the benign inflammation of one or more costal cartilages. This is what causes the horrible, heart-attack mimicking pain that many people with thoracic spine problems experience.
On Prolotherapy...IMHO, stay away, very far away. Injecting unknown, foreign substances, often with proprietary forumlations, is not high on my list of things to do to my body. Some less savory practicioners have even been known to inject industrial chemicals
If you are experiencing slipping rib syndrome, I would suggest seeing a chiropractor (DC, DABCO or DC, DACBSP) or physical medicine and rehabilitation specialist who can provide you with strengthening exercise regimines, along with manipulation and therapeutic modalities to help resolve this issue.