Adams has not played for the Grizzlies since suffering the injury in January, and Memphis said Sunday that “non-operative rehabilitation did not resolve ongoing knee instability.”
The Grizzlies said they expected Adams to make a full recovery for the 2024-25 season.
Adams was originally expected to miss three to five weeks when he was first injured diving for a loose ball during a game against the Phoenix Suns. But that absence extended into the rest of the 2022-23 season.
The 30-year-old is under contract through 2024-25 after reaching a two-year, $25.2 million extension during training camp last year. He has averaged 7.5 points and 10.6 rebounds per game since joining the Grizzlies in the 2021 offseason.