"Following surgery and rehabilitation on his injured hip, it was discovered that Jackson had avascular necrosis, as a result of decreased blood supply to the head of his left femur. This caused deterioration of the femoral head, ultimately requiring that the hip be replaced. Jackson missed the entire 1992 baseball season. When he announced soon after his surgery that he would play baseball again, many thought that goal to be unrealistic, especially at the Major League level."
Belle's White Sox contract had an unusual clause allowing him to demand that he would remain one of the three highest paid players in baseball. In October 1998, Belle invoked the clause, and when the White Sox declined to give him a raise, Belle immediately became a free agent. Belle again became the game's highest paid player, signing a five-year, $65 million deal with the Baltimore Orioles. However, Belle ended his career just two seasons later, retiring at age 34 as a result of degenerative osteoarthritis in his hip. However, he was kept on Baltimore's active 40-man roster for the next three years, as a condition of the insurance policy which largely reimbursed the Orioles for the remainder of Belle's contract.
Source: WikiPedia
Both Belle and Jackson had bone conditions. Unless his hip bone itself gets infected (the cyst, perhaps?) it's not nearly the same thing.