I think that all Thai Boxers suffer from bruised shins.I remember this one time I threw a shin kick to the midsection of my sparring partner,he blocked it "text book perfect".As a result my shin slammed into his knee.At first it didnt hurt to much and I kept sparring.After my match(it was actually a MMA class not Muay Thai,we where just messing around before class) my clave started to lock up,alot!I kept training though,after class,my clave was in some serious pain!I managed to drive home and when I got out of the car I could barely walk.The pain was so bad(luckly it happend on Thursday) that I had to stay home from work the next day.Im not sure what happend but I think that I bruised the bone itself.I could barely walk for the next week and it took about a month and a half to heal.