Celtics  forward Brian Scalabrine  cannot participate in one-on-one drills until April 1, he said prior to Friday’s game against the Cleveland Cavaliers . In the meantime he will do excercises that do not involve “bouncing,” including the stationary bike and stairclimber. Scalabrine, who was diagnosed with post concussion syndrome, has not suffered from blurred vision since Tuesday. (A plus considering he said he parked Eddie House’s car.) He has not played since February 19 against the Utah Jazz .