Defense doesn't measure up

The Celtics' struggles on defense this season have been cause for concern. Here are three things that stand out:

1. They are awful in transition. They're allowing 1.427 points per play in transition this season, last in the league. Boston's transition defense has steadily dropped off the last few seasons.

2. The defense does not travel well. While Boston has been solid defensively on its home court, allowing 98.9 points per 100 possessions (14th), the same has not been true on the road. Away from home, the Celtics have allowed 106.5 points per 100 possessions (25th in the league).

3. The defense crumbles when KG leaves the floor. When Kevin Garnett is on the court, Boston has a defensive rating of 94.6, which would be the best mark in the league. But he doesn't play 48 minutes a night. So when Garnett has been off the floor, Boston's defensive rating is 114.2, which would be the worst in the league by a large margin.