Advanced Knee Replacement
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The Advanced Knee Replacement is a device used in Portal to keep Test Subjects from injuring themselves due to falls from great heights. They protect the player from falling damage at any speed, even from terminal velocity. After being dragged back into the facility by the Party Escort Bot, Chell's advanced knee replacements are destroyed. They are superseded in Portal 2 by the Long Fall Boots.
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Trivia
- The idea for the Advanced Knee Replacement was recycled from a cut character from Half-Life 2, the Combine Assassin.