In California, I am pretty sure there is no statute of limitations on reporting an injury sustained at work.
That being said, since you have lagged in reporting it, you probably will take a ration of sh*t from management. You should not let this intimidation tactic stop you. Report it, go through the bull that is to come (from Workman's comp AND your employer- we are talking about a state run organization after all) and stick to the facts. Write down everything that has happened since the initial injury and give 'em hell. Get on the paper trail and don't miss a chance to document any/all events, conversations,
etc...related to this.
As a bit of encouragement, a buddy of mine just got off his butt six months after the fact of an injury and he still got treatment for it courtesy of worker's comp. Your results may vary.