KAI ROONEY has been left heartbroken as he revealed he has suffered an injury after sharing pictures of himself with crutches.The son of Manchester United legend Wayne, insisted that “life can’t get worse” on Instagram.GettyKai Rooney has sufffered an injury[/caption]Eamonn & James ClarkeHe shared this image on social media[/caption]Kai, 15, took to the social media platform to share images of himself on crutches.The picture showed Kai wearing a medical boot and using crutches.He wrote on the image: “Life can’t get worse”.United supporters have reacted to the news and flooded social media with sympathy for the teenager.One posted: “Wishing him a speedy recovery.”A second commented: “Hope it gets better soon.”A third wrote: “Come back stronger young man.”A fourth said: “Need you on the pitch soon.”The injury comes just after his surprising call-up to the United U19s squad.More to follow…THIS IS A DEVELOPING STORY..The Sun is your go to destination for the best football, boxing and MMA news, real-life stories, jaw-dropping pictures and must-see video.Like us on Facebook at https://www.facebook.com/TheSunFootball and follow us from our main Twitter account at @TheSunFootball.