Knee extension is the straightening of the leg at the knee joint, moving it from a bent (flexed) position to a straight position.
In simpler terms, it's what happens when you kick your leg out straight in front of you. It's the action of unbending the knee. Typically, knee extension refers to returning the leg to a neutral, straight position where the leg is aligned.
However, in some instances, knee extension can go beyond this neutral point, leading to hyperextension. Hyperextension is when the knee bends slightly backward, beyond its normal range of motion.
Here's a breakdown:
- Normal Knee Extension: Bringing the lower leg in line with the upper leg, creating a straight leg.
- Knee Hyperextension: Extending the knee beyond straight, causing a slight backward bend. This is not always desirable or safe and can lead to injury.
Think of these examples:
- Example of Knee Extension: Kicking a ball straight ahead.
- Example of Knee Hyperextension: Locking your knees back when standing for a long time.
In summary, knee extension is the act of straightening your leg at the knee, while hyperextension is an overextension that goes beyond the normal straight position.
