Christ Hospital's board of trustees voted unanimously last night to approve filing a bankruptcy plan in the wake of Prime Healthcare Services withdrawing its bid to purchase the Palisade Avenue medical facility, hospital officials revealed today. The board will make the Chapter 11 reorganization filing "if necessary" to maintain the hospital's financial stability and to preserve its commitment to its patients, according to a press release issued this morning. Christ Hospital spokesman Paul Hebert said he had no further comment.