The knee surgery Mavericks forward Chandler Parsons had in May was more serious than the team initially indicated, ESPN’s Tim MacMahon reports.

The knee surgery Mavericks forward Chandler Parsons had in May was more serious than the team initially indicated, ESPN’s Tim MacMahon reports.

When Parsons had the surgery on May 1, the team described it as “arthroscopic surgery ... to address a cartilage injury to his right knee.” The surgery was actually “a ‘minor hybrid’ microfracture operation,” MacMahon reports.

The surgery “included a bone marrow transplant from Parsons’s right hip to help regenerate the cartilage damage,” MacMahon adds.

Because of the injury, Parsons was inactive for 13 of Dallas’s last 25 regular season games. He played in the first game of the Mavs’ opening-round playoff series against the Rockets but was forced to sit out Game 2 and was shut down for the season the next day. He had the surgery one week later.

• Parsons ranked 66th in SI’s Top 100 Players | Southwest division grades

Parsons signed a three-year, $46 million contract with the Mavericks before last season and averaged 15.7 points and 4.9 rebounds in his first season with Dallas.

The Mavericks open training camp on Tuesday and Parsons has to be cleared for action. New arrivals Wesley Matthews and JaVale McGeeare also injured.

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- Dan Gartland