Holger Badstuber is probably the worst case scenario. He injured it in 2012 @ at ~22 years old. Injured it again and his career went into a tail spin.
https://www.transfermarkt.us/holger-badstuber/verletzungen/spieler/54659
https://www.theguardian.com/sport/2017/may/11/acl-injuries-sports-athletes-careers
Not a defender but best case is Roberto Baggio. He tore his at age 18...
Ronaldo's sounded particularly severe.
https://www.fourfourtwo.com/us/performance/training/ronaldos-knee-cap-exploded-it-was-his-thigh
https://www.transfermarkt.us/holger-badstuber/verletzungen/spieler/54659
https://www.theguardian.com/sport/2017/may/11/acl-injuries-sports-athletes-careers
Not a defender but best case is Roberto Baggio. He tore his at age 18...
Ronaldo's sounded particularly severe.
https://www.fourfourtwo.com/us/performance/training/ronaldos-knee-cap-exploded-it-was-his-thigh

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