Zach Lavine, the Bulls star shooting guard, has missed the team's last two game with a nagging left knee injury that could keep him out through the All-Star break.Lavine reportedly traveled to Los Angeles this week to see a knee specialist for the recurring discomfort.The 26-year-old reportedly said he plans to participate in All-Star weekend, including the 3-point contest, but that might not be the best course of action, according to the ProBasketballDocs.Lavine missed five games after landing awkwardly on his left knee on January 14. He had reportedly playing through swelling in that knee before aggravating the knee on that play in mid-January.The ProBasketballDocs say the key is to determine why the swelling is happening. Clearly it is a recurring issue now with the knee.Lavine previously tore the ACL in his left knee in February 2017. The ProBasketballDocs project that Lavine will likely undergo a platelet-rich plasma (PRP) injection and require a short shutdown period.Using the All-Star break for that short shutdown period would make the most sense.The hope is he can avoid or delay surgery through load management.At 37-21, the Bulls sit in second place in the East and will need Lavine healthy for the playoffs.Lavine ranks 12th in the league with 24.9 points per game. His teammate DeMar DeRozan ranks third with 27.9 points per game.