Conversation so far:
What happened regarding the Deftones in 1988?
When Stephen Carpenter was 15 years old, he was hit by a car while skateboarding.
Was Stephen Carpenter seriously injured by the car?
Stephen Carpenter was confined to a wheelchair for several months.
When was Stephen Carpenter rehabilitated?

Question: was he in the wheelchair at this time?
Self-contained rewrite: Was Stephen Carpenter in the wheelchair during the Early years of Deftones?