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What is 'Whip-lash’ injury is caused due to and explain in detail?
syn: acceleration injury, cervical sprain syndrome, soft tissue neck injury

* it is an unconventional & inconsequential ligamentous injury of the cervical spine allegedly due to an extension injury following a rear-end collision in an RTA
* clinical features: symptoms - upper neck pain becomes worse with movement - an occipital headache - neck stiffness - rarely vertigo, auditory or visual disturbance: sign - decreased range of movements - neck muscles spasm
* investigation - x-ray usually normal. MRI helps to make a diagnosis 
* treatment - conservative