The Beverly Hills, 90210 star, 50, shared the news of 16-year-old Liam via Instagram. "To everyone that's asked, Liam fell down the stairs at home and has been in pain and immobile since (sic).” "(Six) weeks plus no healing, we got many opinions, and Liam's navicular accessory fractured bone in (his) right foot needed to be removed, and then tendon reattached to his main bone with a metal hook rod." "Now, the recovery process begins. It's going to be a long journey, but we take it day by day."