Glossary /// Alias
Cervical flexion crank escape
Also known as Can Opener Escape — the canonical term used on this site.
Anatomical — forced flexion of the cervical spine
Cervical flexion crank escape is the anatomical name for can opener defence, describing the loading precisely: forced flexion of the cervical spine, chin driven toward chest.
Etymology. The clinical phrasing is used where the injury mechanism matters more than the grappling context — coaching notes on neck safety, for instance. It makes clear that this is a spinal load rather than a joint lock, which is why the tapping guidance is stricter.
Mechanics. Cervical structures give poor and late warning under flexion load, so the correct response is positional rather than sensory: open the guard on recognition rather than waiting to judge severity. Tucking the chin early shortens the lever the attacker’s hands are working.
Cross-reference. “Neck crank guard break defence” is the functional name. Full escape coverage on Can Opener Escape.