New city, same problems.

The Philadelphia 76ers announced Monday they are shutting down newly acquired center Andrew Bynum for three weeks to "maximize therapy" on a right-knee bone bruise.

The team describes shutting down Bynum as "precautionary," and he can still participate in "low-impact conditioning drills."

As a result, the Sixers have added veteran center Mikki Moore to their training camp roster.

Bynum has a long history of knee problems, missing 154 games over the last five seasons because of various injuries. In 2008, he suffered a dislocated kneecap. In 2009, he tore his right MCL. In 2010, he injured his knee again but played through it, undergoing knee surgery in the offseason. Last season was really the first year in which Bynum has managed to stay mostly injury free.

During the offseason, Bynum had Orthokine therapy done on his knee -- better known as the Kobe knee treatment.

The expectation is Bynum will miss most of preseason but be ready to go for the entire regular season assuming there are no setbacks or complications. If the three weeks goes as planned, Bynum would play in Philly's last preseason game on Oct. 22.

The seven-footer was dealt to the Sixers in the four-team Dwight Howard trade that sent Andre Iguodala from Philadelphia to Denver.