In addition to his knee condition, Williams has also dealt with tendinitis in his left knee, which he revealed to reporters during the Las Vegas Summer League in 2018. He also suffered a left knee contusion during the first quarter of a summer league game, causing him to miss two of the team's three games.

Williams played through pain due to a left knee injury sustained during the Celtics' 2022 playoff run. The injury was the result of surgery to repair a torn meniscus he suffered a few weeks before the end of the NBA season. Although he returned within the minimum time allotted, he was in and out of the Celtics' lineup during the playoffs due to soreness and other complications with his surgically repaired knee. Despite the prognosis, Williams did not miss a game during the NBA Finals, as the Celtics' medical staff assured him that he wouldn't do more damage to his knee.

However, former Celtics star Isaiah Thomas cast doubt on the medical staff's assessment. Thomas experienced a similar situation with the Celtics when he played through pain in his hip to help the team reach the Eastern Conference Finals in 2017. Thomas felt that the Celtics didn't explain the extent of his injury or the risks of playing through it, which later led to a torn labrum and hip problems.

Williams expressed that he has no regrets about playing through his injuries, stating that his dream was to play in the NBA Finals. While injuries are an unfortunate part of any athlete's career, it's clear that Williams is determined to continue playing at the highest level despite any challenges he may face.

Despite the potential risks, it seems unlikely that the Celtics would risk Williams' long-term health even to win another NBA title, especially considering he is under contract with Boston for another four years with a total value of $48 million. Nonetheless, Williams takes his treatment day by day, admitting that it gets to him a lot and that he has to manage his knee to be able to play.

PAES is a condition that could potentially affect Williams' performance on the court due to cramping and calf pain during exercise. However, the sources describe the condition as "not too serious" and note that there are no signs at this time of it getting any worse than it has previously been. Williams made his season debut for the Celtics on December 16, 2022, after missing the first 29 games of the season following a second knee surgery.

In conclusion, Robert Williams III has been dealing with various injuries throughout his NBA career. He has shown great determination in playing through pain, but the risks associated with playing through injuries like PAES and knee injuries are evident. Nonetheless, the Celtics have assured Williams that he won't do more damage to his repaired knee, and he will continue to manage his knee to be able to play at the highest level possible.