Purvis scratched out of last week 's Oregon Relays with a back problem .
The Ducks also need a return to health by sprinter Amber Purvis , who could be a factor at the NCAA meet in both short sprints and both relays .
factor scratched out of last week 's Oregon Relays with a back problem .
The Ducks also need a return to health by sprinter Amber Purvis , who could be a factor at the NCAA meet in both short sprints and both relays .