I Need New Kneecaps

Because my current ones aren't doing their job. Instead of protecting my knees in a fall, they simply jump out of the way to avoid injury themselves, leaving the joint the take the brunt of the blow. My left kneecap, in particular, has done a horrible job of protecting my knee, allowing three rather badly bruising injuries in under a year. I think I need to replace them with something larger - something that encompasses the entire joint and flexes with it. They're doing amazing things with plastics these days. Maybe I should ask Torg and Riff where they got theirs.