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a–e Unstable knee prosthesis which required revision arthroplasty by means of a rotating hinged prosthesis. a Preoperative radiograph. b Intraoperative view of the removed components. c View of the components of the rotational hinge prosthesis to be implanted. d Intraoperative view of the rotating hinged prosthesis already implanted. e Anteroposterior post-operative view of the new prosthesis (satisfactory result)
