I am sorry for the bad news. My understanding is that cartlidge is not repairable. The exercises help compensate for the torn cartlidge. While I don't run, I do walk (altho not much lately cause I am overworked) and you can do that even on a treadmill. As long as there is no pain.

VOYAGER:
MC to FLL 11/07
MC/Dover 6/06
MARINER:
BCN / Ven 10/11
Alaska 2001|2006
Panama Canal 2003
NAV
Caribbean 11/06
Bermuda|New Eng/Canada 6/04
PG 5/05
OCEANIA
Nautica |Ist/Athens 6/07
Regatta|Baltics 6/08
Riviera 2013 Crossing -Istanbul to Miami