What is the primary reason to avoid overextension when executing a knee bar, even if a tap is imminent?

The primary reason to avoid overextension when executing a knee bar, a submission hold that hyperextends the knee joint, even if a tap (submission signal) is imminent, is to prevent severe and permanent injury to the opponent's knee. While the goal of a submission is to force a tap, it should never be achieved at the cost of causing irreversible damage. Overextension in a knee bar can lead to significant ligament tears (ACL, MCL, PCL, LCL), meniscus damage, and even fractures. These injuries can require extensive surgery and rehabilitation, potentially ending an athlete's career or causing long-term chronic pain. Controlling the application of the knee bar and stopping immediately upon the tap demonstrates responsible technique and prioritizes the safety of the training partner. It's crucial to apply the pressure gradually and monitor the opponent's reaction to ensure they have ample opportunity to tap before reaching the point of overextension.