MOVABILITY on Instagram: "Craniocervical Instability: The Hidden Mechanisms. Most people are told it is anxiety. It is not. CCI is a systems problem with real biomechanics. I am Dr. Sina. I work with CCI every day. Here is the map I use in clinic. What CCI is: a spectrum. Structural plus functional, often together. Structural: bone or ligament failure at C0 to C2 can allow the junction to translate or angulate and compress brainstem, cord, or vertebral arteries. Symptoms can be severe. Functiona