Why Is It so Difficult to Find Medical Providers that Do Upper Cervical Facet Injections like C0-C1?

Why Is It so Difficult to Find Medical Providers that Do Upper Cervical Facet Injections like C0-C1 and C1-C2? ~-~~-~~~-~~-~ Please watch: "Cervical Disc Replacement Movement vs Normal Disc"    • Cervical Disc Replacement Movement vs Norm...   ~-~~-~~~-~~-~