The bone scan record was sealed by the court and not released to the family until 2002, that's why.
Ahem. That's an urban legend. It's become increasingly clear the Schindlers say stuff to stir up their supporters but under oath they admit the truth, which doesn't back up the stuff ya'll have fallen for.
The Schindler atty admitted the bone scan had been available to them and did not even try to say it was kept secret:
http://abstractappeal.com/schiavo/trialctorder11-02-scan.pdf