All of his injuries (3, really - 2 dislocations and 1 hyperextension) were freak things - none were just the knee going out on him. One was knee-on-knee contact, one was getting bent back in the air to land with the leg bent under him, and one was his shoe losing grip on a wet spot on the floor. So, at least none of the injuries were due to the knee just giving out or the patella slipping during normal activity.
Still, each injury makes another more likely. Dislocations create microtears in ligaments and tendons, which then have microscarring... which just leads to a looser joint over time. Will it go out again next year? No guarantee it would, or that it wouldn't. It's more likely to be injured than another player without prior knee injuries, though, to be sure.