According to Cal/OSHA ... the worker, listed as an employee of CBS Studio Center, was hospitalized for a dislocated shoulder, and an investigation into what happened is underway.
It's unclear if he was working on a specific production at the time of the accident. A CBS source says it was not one of their own shows. The location is known as the home to several popular shows -- for instance, "Big Brother" and "The Conners" -- but not all of them air on CBS.
As you may recall ... a 'Conners' crew member died at the site earlier this year after suffering a medical emergency.