Answer
These are two intracapsular ligaments in the knee joint:
1. The anterior cruciate ligament (ACL) prevents (limits) hyperextension of the extended knee.
2. The posterior cruciate ligamen (PCL) prevents backward displacement of the tibia when the knee is flexed; it also prevents the femur from sliding off the tibia, anteriorly.
Work Step by Step
These intracapsular ligaments are enfolded by the synovial bembrane and ar thus separated from the synovial cavity. Cruciate means "crossed," and the ACL and PCL cross on their way from their origins on the tibia to their points of attachment on the femur. The ACL gets damaged in about 70% of knee injuries but more often in men than in women
