Is that I know someone who had terrible ankle pain (a young woman in her early twenties, I worked with). She also has the genetic problem--Marfan's syndrome. Well, she sprained her ankle, and in reality the doctors minimized her, like they did to you, Daniella. She, unlike her mother who is also Marfan's has less other physiological signs (aorta etc). Marfan's females are often not diagnosed, since they don't "show" the signs like the males.
http://en.wikipedia.org/wiki/Marfan_syndrome
The only reason she knew she had it was that her Mom tested all the kids.
Otherwise she could have gone a LONG time before anything showed up, if it ever did!

What ultimately happened was that a whole tendon in her ankle dissolved away.
She had to have surgery to reconstruct one. Marfan's patients have problems with collagen formation, and combined with the damage from the sprain, that tendon just died and was reabsorbed. (this took about 3 yrs).
Her surgery was successful.