The knee is made up of the tibia (leg bone), femur (thigh bone), and patella (knee cap). Ligaments hold the bones together, and the patella lies in the quadriceps muscle in front of the knee. Meniscus tear is a typical cause of knee pain when bending.
What Is It: A meniscus tear can happen once a forceful twist or rotation of the knee is performed. When there is tearing or fraying in the meniscus, it results in inflammation and reduces the joint’s cushioning. The torn fragment penetrates the joint, limiting any movement.
Causes: Wear and tear, sudden twisting of the knee, kneeling, deep squatting, or lifting massive objects.
Symptoms: Difficulty extending the knees fully. Pain when bending the knees, particularly going upstairs or squatting down. Limited knee movements and a feeling as if your knee is locked in place when attempting to move it.
Onset: May develop gradually from wear and tear or suddenly as a result of an injury.