Some good news, bad news for MMA legend Rampage Jackson ...
GOOD NEWS -- He beat up Wanderlei Silva at Bellator 206 last month.
BAD NEWS -- He broke his left hand while punching the dude in the head!
It was the 4th meeting between the two -- and Rampage was able to even the series with a 2nd round TKO.
"I feel good," 40-year-old Rampage told TMZ Sports ... "I needed that."
Rampage revealed he was injured going into the fight -- "I hurt my right hand in my last sparring" -- but says he jacked up his other fist while inside the cage.