Your knees might hurt during leg extensions due to the specific stress this exercise places on the joint. Leg extensions are known for potentially causing knee issues because of the mechanics involved.
Here's a breakdown:
-
Increased Force on the Knee: Leg extensions uniquely load the knee joint. According to research, "because weight is placed on the ankles, the knee experiences a great deal of added force as it extends."
-
Patella and Tendon Strain: This added force can lead to strain and potential injury, specifically:
- Patella: The patella (kneecap) can experience excessive pressure.
- Quadriceps Tendon: The quadriceps tendon, which connects the quadriceps muscles to the patella, is also subjected to increased stress. This can potentially lead to a quadriceps tendon injury.
In essence, the leg extension exercise creates a mechanical disadvantage for the knee, making it vulnerable to pain and potential injury. Consider alternative exercises or modifications to reduce this stress.
