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  • Bulls guard Lonzo Ball looks on as his head coach...

    Terrence Antonio James / Chicago Tribune

    Bulls guard Lonzo Ball looks on as his head coach Billy Donovan comments in the second half of a game against the Magic at the United Center on Jan. 3, 2022.

  • Lonzo Ball speaks as the Bulls discuss the end of...

    Brian Cassella / Chicago Tribune

    Lonzo Ball speaks as the Bulls discuss the end of their season April 28, 2022, at the Advocate Center.

  • Bulls guard Lonzo Ball celebrates after hitting a 3-pointer in...

    Chris Sweda / Chicago Tribune

    Bulls guard Lonzo Ball celebrates after hitting a 3-pointer in the second half of a game against the Pistons at the United Center on Oct. 23, 2021.

  • Bulls guard Lonzo Ball aims for a successful 3-pointer in...

    John J. Kim / Chicago Tribune

    Bulls guard Lonzo Ball aims for a successful 3-pointer in the first quarter against the Warriors at United Center on Jan. 14, 2022.

  • Lonzo Ball is seen in street clothes in the second...

    Terrence Antonio James / Chicago Tribune

    Lonzo Ball is seen in street clothes in the second half of a Bulls game against the Hawks at the United Center on Jan. 23, 2023. The Bulls won 111 - 100.

  • Bulls guard Lonzo Ball looks before making a three-point basket...

    Armando L. Sanchez / Chicago Tribune

    Bulls guard Lonzo Ball looks before making a three-point basket during the first half against the Lakers at the United Center on Dec. 19, 2021.

  • Lonzo Ball takes the court before the a Bulls preseason...

    Armando L. Sanchez / Chicago Tribune

    Lonzo Ball takes the court before the a Bulls preseason game against the Cavaliers at the United Center on Oct. 5 2021.

  • Lonzo Ball poses for pictures at Bulls media day at...

    Brian Cassella / Chicago Tribune

    Lonzo Ball poses for pictures at Bulls media day at the United Center on Sept. 27, 2021.

  • Bulls guard Lonzo Ball defends against his brother, Hornets guard...

    Terrence Antonio James / Chicago Tribune

    Bulls guard Lonzo Ball defends against his brother, Hornets guard LaMelo Ball, at the United Center on Nov. 29, 2021.

  • Lonzo Ball before a Bulls game against the Cavaliers at...

    John J. Kim / Chicago Tribune

    Lonzo Ball before a Bulls game against the Cavaliers at United Center on Oct. 22, 2022.

  • Lonzo Ball poses at Bulls media day at the United...

    Brian Cassella / Chicago Tribune

    Lonzo Ball poses at Bulls media day at the United Center on Sept. 27, 2021.

  • New Bulls players, including Lonzo Ball (left) and Alex Caruso...

    Chris Sweda / Chicago Tribune

    New Bulls players, including Lonzo Ball (left) and Alex Caruso (second from left), have a laugh on the field after throwing out the ceremonial first pitches before a game between the White Sox and the Angels at Guaranteed Rate Field on Sept. 15, 2021.

  • Bulls guard Lonzo Ball stands with his team near the...

    Armando L. Sanchez / Chicago Tribune

    Bulls guard Lonzo Ball stands with his team near the bench during the second half of a preseason game against the Cavaliers at the United Center on Oct. 5 2021.

  • Bulls guard Lonzo Ball yells after getting a foul called...

    Armando L. Sanchez / Chicago Tribune

    Bulls guard Lonzo Ball yells after getting a foul called on him during the second half against the Knicks at the United Center on Nov. 21, 2021.

  • Lonzo Ball arrives to speak as the Bulls discuss the...

    Brian Cassella / Chicago Tribune

    Lonzo Ball arrives to speak as the Bulls discuss the end of their season on April 28, 2022, at the Advocate Center following their playoff loss to the Bucks.

  • Bulls guard Lonzo Ball follows through on a shot in...

    Chris Sweda / Chicago Tribune

    Bulls guard Lonzo Ball follows through on a shot in the first half against the Pistons at the United Center on Oct. 23, 2021.

  • Guards Coby White and Lonzo Ball pose at Bulls media...

    Brian Cassella / Chicago Tribune

    Guards Coby White and Lonzo Ball pose at Bulls media day at the United Center on Sept. 27, 2021.

  • Guards Alex Caruso and Lonzo Ball pose at Bulls media...

    Brian Cassella / Chicago Tribune

    Guards Alex Caruso and Lonzo Ball pose at Bulls media day at the United Center on Sept. 27, 2021.

  • Rockets forward Kenyon Martin Jr. defends against Bulls guard Lonzo...

    Terrence Antonio James / Chicago Tribune

    Rockets forward Kenyon Martin Jr. defends against Bulls guard Lonzo Ball in the first half at the United Center on Dec. 20, 2021.

  • Injured Bulls guard Lonzo Ball, right, greets his little brother,...

    John J. Kim / Chicago Tribune

    Injured Bulls guard Lonzo Ball, right, greets his little brother, Hornets guard LaMelo Ball after a 133-117 loss at the United Center on April 8, 2022.

  • Injured Bulls guard Lonzo Ball sits on the bench in...

    John J. Kim / Chicago Tribune

    Injured Bulls guard Lonzo Ball sits on the bench in the first quarter against the Bucks at United Center on April 5, 2022.

  • Ayo Dosunmu and Lonzo Ball watch the Bulls in the...

    Armando L. Sanchez / Chicago Tribune

    Ayo Dosunmu and Lonzo Ball watch the Bulls in the playoffs against the Bucks at Fiserv Forum on April 17, 2022.

  • Bulls guard Lonzo Ball walks to the locker room before...

    Armando L. Sanchez / Chicago Tribune

    Bulls guard Lonzo Ball walks to the locker room before the a preseason game against the Cavaliers at the United Center on Oct. 5 2021.

  • Bulls guard Lonzo Ball smiles after making a three-point shot...

    Armando L. Sanchez / Chicago Tribune

    Bulls guard Lonzo Ball smiles after making a three-point shot during the second half against the Pistons at the United Center on Jan. 11, 2022.

  • Bulls guard Lonzo Ball throws the ball off the backboard...

    Chris Sweda / Chicago Tribune

    Bulls guard Lonzo Ball throws the ball off the backboard for an assist on a Zach LaVine dunk in the first half against the 76ers at the United Center on Nov. 6, 2021.

  • Bulls guard Lonzo Ball gestures after making a three-point basket...

    Armando L. Sanchez / Chicago Tribune

    Bulls guard Lonzo Ball gestures after making a three-point basket during the first half against the Mavericks at the United Center on Nov. 10, 2021.

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Chicago Bulls point guard Lonzo Ball underwent a cartilage transplant in his left knee Monday, a rare procedure that could decide the fate of his return to the court.

This was the third surgery on Ball’s left knee in the last 14 months. Uncertainty has shrouded every step of Ball’s recovery since the injury occurred in January 2022, but this procedure throws Ball’s future into completely unprecedented territory.

Cartilage transplants are rare in professional sports. The procedure is relatively new, designed as a step down from a full knee replacement to maintain the integrity of the knee joint. No NBA player has undergone a cartilage transplant and returned to the court.

Coach Billy Donovan said Ball’s doctors were optimistic after the procedure Monday. But with no clear timetable or standard of success to look toward, the Bulls don’t know what to expect from the next stage of Ball’s recovery.

“There’s nothing that’s out there that says that, ‘Hey, here’s how guys have come back and been able to respond to this,'” Donovan said. “But I do know that Lonzo — just based on the information he was able to gather from different sets of doctors making the decision — felt like this was the best chance to be able to get him back on the court.

“I think we all understand that’s going to be an uphill battle for him, but I know that he’s going to do everything possible in his rehab to get himself back on the court.”

Growth in sports medicine continues to bear improvements in athletes’ ability to recover from major injuries.

Donovan cited Bernard King — a former New York Knicks and Washington Bullets star who became one of the first players to return in full from a major ACL reconstruction in 1987 — as a reminder of hope. A torn Achilles used to be similarly catastrophic, but Phoenix Suns star Kevin Durant and New York Liberty star Breanna Stewart made full returns from the injury in 2019.

But the Bulls also know this procedure is a reflection of desperation. For Ball, the goal isn’t just to reclaim his starting role with the Bulls — it’s to get back on the court at all.

The target date for that return is another area of uncertainty. Reports from The Athletic suggest Ball could miss the entire 2023-24 season. Donovan did not rule out Ball playing next season, but the Bulls will plan to enter their second consecutive year without him.

“It’s indefinite,” Donovan said. “I did not really get a timetable, just that he is going to be out indefinitely. My feeling would be next year’s training camp, you’ve got to go in there with him not being available.

“I think you have to prepare like that, but I just don’t know what the length of time actually will be for him being able to get at some point back on the court playing again.”

Ball has played only 35 games in his first two seasons with the Bulls after signing a four-year, $80 million deal in August 2021. As he faces a potential third season on the sidelines, the Bulls will need to make adjustments in the offseason to account for their lack of a starting point guard.

That could come in the form of retaining Patrick Beverley, who has offered a significant lift since signing with his hometown team last month. But regardless of whether it comes from the current roster or elsewhere in the league, the Bulls must find an answer at the point as Ball’s future remains a mystery.