An insider revealed to People that Zac, who slipped in a puddle, had to have his jaw wired shut as a result of his fall, and received stitches.
The California-born star also had to delay plans to promote his new film, That Awkward Moment.
"This is incredible -- you're all an inspiration. So excited for the future. Love you guys! - Z"
In September, it was revealed that Zac had completed a stint in rehab earlier in 2013. Sources said that after ascending to A-list status following the success of the second High School Musical film, he fell in with the wrong crowd.
Later in September, Zac broke his silence for the first time since news of his attempt to get help became public knowledge.
Posting an Instagram picture of himself at the Machu Picchu mouton ruins in Peru, he wrote in the caption, "Hey guys! Just returned from an incredible trip to Peru with my dad and wanted to thank you all for your support these past few weeks… means the world to me. Love you guys — Z."