In a groundbreaking move, Knicks president Isiah Thomas has hired Dr. Lisa Callahan, who diagnosed Vin Baker's irregular heartbeat, to be the club's No. 1 medical decision-maker, The Post has learned.

Callahan, who served two years with the football Giants, joined the Knicks last week as the team's director of player care, responsible for all aspects of players' health, a team source said.

Callahan will oversee issues from minor dental work to the messy complexities of Allan Houston's knee rehab and, of course, Baker's heart condition. No other NBA team has created such a high-ranking medical position. Dr. Norman Scott remains as the club's orthopedist, but Dr. Callahan, who's here with the team, is in charge of recommending all courses of action.

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