Cameron Fanning, 21, previously admitted an offence of inflicting grievous bodily harm on the woman and an offence of criminal damage on June 15, 2019, in Ludlow.
He was sentenced at Shrewsbury Crown Court after a judge heard how an argument between him and the woman with whom he'd had an "on-off" relationship turned violent.
Prosecuting barrister Miss Lynette McClement said the pair had spent the previous evening drinking at a pub in the town with a group of friends before visiting a property, in Dodmore Lane.
She said when the woman declined to go home with the defendant he accused her of "wanting to go to see another man".
Miss McClement said they left the property together on foot at about 3am and argued on the way during which Fanning pushed her and grabbed her handbag by the strap, resulting in it falling in the road.
"She turned to walk away at which point the defendant kicked out at her on the right leg. She described it as a sweeping kick that took both legs from under her.
"She landed on her back and was lying in the road and was crying. He shouted at her saying 'I will give you something to cry about'. The contents of her bag were strewn on the ground.
"The defendant picked up her phone – he threw it down on the road with force to break it," Miss McClements said.
She said the next day a hospital scan showed that she sustained a fracture below her right knee. She also suffered pain and bruising to her right elbow and left leg.
Mr Andrew Green, mitigating, said: "This was an ugly and serious offence. Cameron Fanning is under no illusion from the first moment that this was a serious matter that would be taken seriously by the court and crosses the custody threshold."
He said in his favour Fanning had no previous convictions and that his employer had given him a good reference.
But Judge Barrie said: "The violence in this case is too serious. I have come to the conclusion that it is a sentence that must be served."
For the assault Fanning, of Sandpits Avenue, in Ludlow, was jailed for 12 months, and for wrecking the phone he was jailed for one month to run concurrently.
He must serve half and on release will be subject to supervision for 12 months. He will be subject to a restraining order preventing him from contacting the victim in any way for for 10 years. He must also pay the victims' surcharge.