See larger A photo of the x-ray of Bud Dangler, 77, after having partial knee replacement surgery using the RIO Robotic Arm Interactive Orthopedic System. Photos submitted by Dr. Frederick F. Buechel Jr.

A photo of the x-ray of Bud Dangler, 77, after having partial knee replacement surgery using the RIO Robotic Arm Interactive Orthopedic System. Photos submitted by Dr. Frederick F. Buechel Jr.

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