Bo Jackson didn't want the Kansas City Royals to know how severe his hip injury was.

The Royals team doctor on Monday said Jackson asked him not to tell the club about the severity of the hip injury following an examination in February.Jackson, 28, was released by the Royals on Monday after the team determined his football-related hip injury would not allow him to play baseball this year.

General Manager Herk Robinson said the Royals would pay one-sixth of the $2,375,000 contract Jackson agreed to in February after the sides avoided arbitration. Jackson would have only made the full amount of his contract if he was on Kansas City's opening day roster.

"I did examine Bo prior to the arbitration hearing, and I did inform the Royals' trainer," Joyce said. "But Bo did ask me not to speak to Royals management.

"It was a balancing act between being realistic with the Royals and being positive with the patient."

Under the basic major league agreement, a player cannot be released because of injury, but the Royals consider this a football injury.

Jackson sustained the injury, described by Joyce as a fracture-disloaction, in the Los Angeles Raiders' Jan. 13 playoff game against the Cincinnati Bengals.

"It was thought to be a somewhat insignificant injury initially," Joyce said. "We found the normal cartilage face essentially destroyed. In the left hip, we found the weight-bearing cartilage gone. The condition is called chondrolysis."

News media reports have said that Jackson may have avascular necrosis. Medical experts say avascular necrosis generally does not arise from a sudden injury, instead taking years to develop, but that it is potentially disabling as the blood flow to the bone is cut.