Which two ligaments cross inside the knee?

The two ligaments that cross inside the knee are the anterior cruciate ligament (ACL) and the posterior cruciate ligament (PCL). These ligaments are crucial for the stability of the knee joint. The ACL primarily prevents the tibia from sliding too far forward relative to the femur, while the PCL prevents the tibia from sliding backward. Their crossing formation resembles an "X," which is essential for maintaining proper joint function during movement and providing support during activities like running, jumping, and rapid directional changes. Understanding the role of these ligaments is key for both assessment and rehabilitation in a Pilates practice, as they greatly influence knee stability and mobility.