Crabtree underwent surgery, may practice this week

The 49ers offense needs help.  Counting on Michael Crabtree to provide it is dangerous, but the team doesn’t have much of a choice. Coach Jim Harbaugh said the No. 10 pick of the 2009 draft it’s “possible” Crabtree will re-join practice this week after missing all of training camp. Matt Barrows of the Sacramento Bee…