Kalteis, T Greater accuracy in positioning of the acetabular cup by using an image-free navigation system. [electronic resource] - International orthopaedics Oct 2005 - 272-6 p. digital Publication Type: Journal Article; Randomized Controlled Trial ISSN: 0341-2695 Standard No.: 10.1007/s00264-005-0671-5 doi Subjects--Topical Terms: AcetabulumAgedArthroplasty, Replacement, Hip--methodsFemaleHip ProsthesisHumansMaleMiddle AgedOsteoarthritis, Hip--surgeryProspective StudiesStatistics, NonparametricSurgery, Computer-AssistedTreatment Outcome