The Anterior Stability Test of the Atlanto-occipital Joint is a manual test used to assess the stability of the uppermost joint in the neck. It involves manually palpating and manipulating the joint to assess its resistance to movement and stability. This test is used to diagnose stability and mobility issues of the joint as well as to identify signs of pathological conditions such as osteoarthritis, cervical instability, traumatic injury, congenital alignment issues, and severe sprains and muscle spasms