011520 Robotic Surgery (MA)

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Northwestern Medicine's Susie Ranallo, left, helps Dr. John Daniels suite up to perform a partial knee replacement surgery using a Mako robotic-arm by Stryker at Northwestern Medicine Huntley Campus on Wednesday, Jan. 15, 2020 in Huntley.

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Northwestern Medicine's Dr. John Daniels laughs as he gets suited up to perform a partial knee replacement surgery using a Mako robotic-arm by Stryker at Northwestern Medicine Huntley Campus on Wednesday, Jan. 15, 2020 in Huntley.

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Northwestern Medicine's Dr. John Daniels prepares to perform a partial knee replacement surgery using a Mako robotic-arm by Stryker, left, at Northwestern Medicine Huntley Campus on Wednesday, Jan. 15, 2020 in Huntley.

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Northwestern Medicine's Dr. John Daniels prepares to perform a partial knee replacement surgery using a Mako robotic-arm by Stryker at Northwestern Medicine Huntley Campus on Wednesday, Jan. 15, 2020 in Huntley.

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Northwestern Medicine's Dr. John Daniels prepares to perform a partial knee replacement surgery using a Mako robotic-arm by Stryker at Northwestern Medicine Huntley Campus on Wednesday, Jan. 15, 2020 in Huntley.

hnews_0115_Robo_Surgery

Northwestern Medicine's Dr. John Daniels prepares to perform a partial knee replacement surgery using a Mako robotic-arm by Stryker at Northwestern Medicine Huntley Campus on Wednesday, Jan. 15, 2020 in Huntley.

hnews_0115_Robo_Surgery

Northwestern Medicine's Dr. John Daniels prepares to perform a partial knee replacement surgery using a Mako robotic-arm by Stryker at Northwestern Medicine Huntley Campus on Wednesday, Jan. 15, 2020 in Huntley.

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Northwestern Medicine's Dr. John Daniels scrubs his hands and arms as he prepares to perform a partial knee replacement surgery using a Mako robotic-arm by Stryker at Northwestern Medicine Huntley Campus on Wednesday, Jan. 15, 2020 in Huntley.

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Northwestern Medicine's Dr. John Daniels scrubs his hands and arms as he prepares to perform a partial knee replacement surgery using a Mako robotic-arm by Stryker at Northwestern Medicine Huntley Campus on Wednesday, Jan. 15, 2020 in Huntley.

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Northwestern Medicine's Dr. John Daniels sanitizes his hands and arms as he prepares to perform a partial knee replacement surgery using a Mako robotic-arm by Stryker at Northwestern Medicine Huntley Campus on Wednesday, Jan. 15, 2020 in Huntley.

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Northwestern Medicine's Dr. John Daniels prepares to perform a partial knee replacement surgery using a Mako robotic-arm by Stryker at Northwestern Medicine Huntley Campus on Wednesday, Jan. 15, 2020 in Huntley.

hnews_0115_Robo_Surgery

Northwestern Medicine's Dr. John Daniels prepares to perform a partial knee replacement surgery using a Mako robotic-arm by Stryker at Northwestern Medicine Huntley Campus on Wednesday, Jan. 15, 2020 in Huntley.