Sorry to have taken a while to come back to you. From what I can gather you are saying that as a result of your accident - what a dreadful thing to happen to you - you have been left with this horrible chest bone pain. Costochondritis is not a condition that can, in my personal experience, be given a time limit. It has been coming and going with me now for years.
Just a bit more information on costo for you:-
Costochondritis is an inflammation of the cartilage that connects the inner end of each rib with the breastbone (sternum). It can occur in any age group and is most common in young adults. The risk of developing costo increases with any physical activity that causes trauma or strain to the ribcage. It is a benign condition usually of short duration that resolves completely. Sometimes though it can recur or become persistent.
The predominant symptom is a sharp pain in the affected area, most commonly involving the second or third ribs, which are often very tender to touch. (Ribs are counted down from the top and the first rib lies under the collar bone). The pain is usually related to movement, coughing and sneezing and can occur in more than one place simultaneously. Pain can also radiate into the arm and can be associated with a feeling of tightness in the chest.
There is another syndrome - Tietze - that is sometimes diagnosed as costo and vice versa. Perhaps this is worth you looking into, Ed. A bit of info here for you:-
Tietze syndrome has a sudden onset without any preceding respiratory illness or any history of minor trauma. In Tietze syndrome there is frequently radiation of pain to arms and shoulders as well as pain and tenderness associated with swelling at the spot that hurts.
I was interested in the latter beause of your saying that the pain was in your arm too. In costo though, there is normally no swelling or redness in the area. I am not medically qualified, but I am answering this because of your direct request to me, and I can only talk from my own experience
, but I would look in depth at both of these and then match your symptoms and pain to whichever one you think is more relevant.
I did have steroid injections into my ribs because of the costo and I am going to a clinic soon to have them done again. This is the only thing that works for me. I have numerous medical conditons, so things are a bit dicey when it comes to workable treatments for me. This one won hands down though he he. They are uncomfortable to have done done, but worth it.
I do so hope this has helped you in some small way Ed, and if I can help you further please let me know.