Occasionally, and typically following trauma, but not always, one can sustain an injury to the juncture between the ribs and the cartilage between the breast bone (the sternum) and the ribs. Alternatively, the irritation can arise between the sternum and the cartilage. I usually see these sorts of injuries after a motor vehicle accident where the seat belt coming across the rib cage creates the injury or when the chest is driven into the steering wheel is the cause. I have one recent case where the irritability was not traumatic at all, but came on after a case of severe and persistent coughing. Patients following open heart surgery often have to deal with this injury.
This is a difficult injury to manage because there is not much blood supply, and it is made more difficult to treat in hitting and throwing athletes because the rib cage needs to be able to rotate forcefully in those situations.
The pain is felt on the outer third of the chest wall, and is seemingly irritated with breathing deeply. Palpation of the joint line can illicit pain. The pain can be bilateral, but is most often unilateral.
The best treatment for this condition is a combination of aerobic exercise, even though it might hurt to breath at first, ice on the irritated chest wall, and a therapeutic dose of NSAID's on board as tolerated. Physical therapy in the form of manual therapy is valuable to oscillate the joints to promote healing, but this is tricky and needs to be done very carefully. Also, mobilizing the thoracic spine through exercise is key. I really like the TRX as a tool here.
The bottom line is that this is an injury that takes a long time to heal, and is easily irritated again, so the return to sport must be managed on a gradient. For example, in the case of a baseball player returning to practice, I would suggest short toss until that was pain free, then gradually working their way to long toss before trying any hitting drills or throwing in form the outfield. As for hitting drills, swing next to a fence until that was pain free before hitting off a tee, before hitting any soft toss pitches, before hitting any regularly pitched balls, before throwing in from the outfield. In the case of tennis for example, ground strokes before overhead strokes and so on.
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