Rollins part or rotating middle infield

The Phillies used nine different Keystone Combinations this season.

by Bob Vetrone Jr.

Published Dec. 17, 2011, 2:45 p.m. ET

Originally posted as "Phillies Blogathon: Hour 62"

The knee injury that kept Chase Utley from starting the season was the first in a series of events that led to the Phillies using nine different Keystone Combinations this season.

(Editors Note: For those of you under 60 years of age, the Keystone Combination is the second baseman/shortstop.)