I wasn't worried about Shaw patching him up, the Fusco was too "Manly" to be taken down by a knife that sized. I was talking more about the aftermath of what happened at the police station. His investigation gets revealed seemingly implicating him to Sammy's murders, he is outed as a dirty cop, The Man in the Suit is exposed as his partner, the Captain is on the floor, police station pulls guns on both of them, dudes that take them away are shot dead nowhere near where they were suppose to be. Has to explain away why/how he got stabbed.
It's almost a joke like how in that episode where Fusco gets to escort the supermodel and it ends with him firing pistols akimbo and the model pawing at him. That was neat for Fusco, but yeah his ending was a bit of a shoulder shrug.