Footage has emerged of a "disgusting and vicious" attack on a woman police officer which was captured on her body camera.
Sergeant Kerry Lawrence's head was repeatedly banged on the ground by a handcuffed suspect during the assault in Basingstoke, Hampshire.
It happened in the early hours of 6 July last year when she was responding to a report of a burglary in progress.
The video released by her force showed her attacker, Craig Radbourne, apparently drunk, in handcuffs and protesting in a squad car before he lashes out.
An unknown man is then heard calling the emergency services, saying: "We need police, ambulance, everything. Your officer is down, she's on the floor."
The man tried to reassure the officer and she appealed on her radio for colleagues to "hurry up". Back-up is heard arriving minutes later.
Radbourne, 25, of Newport Pagnell, Buckinghamshire, pleaded guilty to a charge of assault causing actual bodily harm.
He was sentenced at Winchester Crown Court to three years in prison.
The video was described by Judge Susan Evans QC as "nothing short of sickening" and she added the officer was fortunate not to be more seriously hurt.
She is now back at work on full duties.