Kelsey Mitchell suffered a lower leg injury in Game 5 of the WNBA semifinals between the Indiana Fever and the Las Vegas Aces on Tuesday. After Mitchell shared her diagnosis on social media, a sports medicine doctor explained what could have happened to the Fever star had she not taken prompt action.In a statement on social media, Mitchell debunked the notion that she was suffering from cramps. She said she had rhabdomyolysis, a condition wherein muscle breaks down and causes pain and confusion. The left-handed guard added that she felt paralyzed for a few seconds, describing it as an out-of-body experience.Brian Sutterer, a sports medicine doctor and YouTuber, explained that the prompt action of the Fever and Aces medical staff saved Mitchell. According to Sutterer, rhabdomyolysis could lead to kidney failure and even death if left untreated. "This is one of the few sports medicine emergencies," Sutterer tweeted. "Left untreated, it can (and has before) lead to kidney failure and death. Job well done to recognize it and get her prompt treatment (loads of IV fluids to help the kidneys remove the muscle protein that has broken down). Had the team won, she almost certainly would have been out for the finals while letting her kidneys normalize and doing a gradual return to play."Kelsey Mitchell is out of the hospital, but it's unclear when she'll get cleared to return to the court. She's signed up to play at Unrivaled in January, joining teammates Aliyah Boston and Lexie Hull.Kelsey Mitchell will be a free agent this offseasonKelsey Mitchell will be a free agent this offseason. (Photo: IMAGN)The Indiana Fever could have a different roster next season, as they have only three players under contract in Caitlin Clark, Aliyah Boston and Makayla Timpson, who are all still on their rookie deals. The rest of the roster, including Kelsey Mitchell, are set to become free agents.According to the IndyStar's Chloe Peterson, Mitchell is still eligible to get a core designation, as long as it remains under the new CBA. But if the rules are changed, the lefty guard would become an unrestricted free agent.Mitchell is coming off her best season as a pro, finishing fifth in MVP voting. She averaged 20.2 points, 1.8 rebounds and 3.4 assists per game while leading the Fever to within one win of the WNBA Finals.