Your knee might be unable to bend due to a few key reasons, broadly categorized as a "true locked knee" or a "pseudo-locked knee".
Understanding Locked Knee Issues
Let's break down the possible causes in more detail:
1. True Locked Knee
- Cause: This occurs when torn knee cartilage gets physically stuck within the knee joint.
- Mechanism: The torn cartilage acts like a wedge, preventing the normal gliding and rotation needed for bending.
- Reference: "The inability to bend or straighten the knee may be the result of a true locked knee (in which torn knee cartilage becomes wedged in the joint)." (04-May-2023)
- Example: Imagine a small rock stuck in the gears of a machine. The knee can't move properly until the obstruction is removed.
2. Pseudo-Locked Knee
- Cause: This occurs when significant pain restricts knee movement.
- Mechanism: Pain triggers a protective muscle spasm. The muscles around the knee tighten up to prevent further injury, effectively limiting the range of motion. This defensive reaction inhibits knee movement.
- Reference: "The inability to bend or straighten the knee may be the result of... a pseudo-locked knee (in which severe knee pain triggers a defensive reaction that impedes knee movement)." (04-May-2023)
- Example: If you touch a hot stove, you quickly pull your hand away. Similarly, knee pain causes muscles to contract and prevent movement.
Therefore, the inability to bend your knee could be due to actual mechanical blockage or a pain-induced protective mechanism. Consulting a healthcare professional is crucial to identify the specific cause and receive appropriate treatment.
