Coach Mike Woodson and Raymond Felton expect Pablo Prigioni to miss Game 1 of the Knicks’ first-round playoff series against the Boston Celtics on Saturday. Prigioni, a 35-year-old rookie, sprained his right ankle in Wednesday’s regular-season finale against the Atlanta Hawks. He was on crutches as he watched Thursday’s practice. It was unclear whether Prigioni would be available for Game 2 on Tuesday. Woodson will have a traditional starting lineup for Saturday’s game instead of the smaller, two-point-guard lineup that he used for most of the season. Woodson said he could start Chris Copeland, who averaged 7.7 points in three games against the Celtics, at small forward. Iman Shumpert will be the shooting guard, Carmelo Anthony will be at power forward and Tyson Chandler, who missed the last six games, will play center. “Chris has shown that he can start and come off the bench,” Woodson said. “That’s been a plus for us.” Woodson made it clear Jason Kidd would stay on the bench, because he still needs a backup for Felton. “We’re definitely going to miss Pablo,” Felton said. “Hopefully we get him back for the second game.”