Thanks for the query to H.C.M. Forum.
As 8 years ago Brodie's abscess
was drained completely as you were symptom free .
In Brodie's abscess infection closely contained so as to create a chronic bone abscess containing pus or jelly like granulation like tissue surrounded by sclerotic bone.
Here I want to explain you that your present injury
will not effect your past illness ,so don't take a tension.
Wait just 2-3 days and spontaneously this contusion
) will resolve.
Still if you don't get relief then consult a surgeon and get his opinion .
If no improvement within 2-3 days then also get in an X-ray of injured part and consult a surgeon.
Hope I have provided information required by you.