I remember from training in the 88 if you land with the gear doors open you have to stop straight ahead and get them pinned up and get towed in. It is in a couple QRH procedures, you do it in the sim. They have skid bumps on them so they don't get damaged but they will scrape across the ground as you land. You can't turn the airplane after landing though because the doors could shear off. I would guess this is what happened.