Impingement-free range of motion, cup coverage and early clinical results between femur first navigation and conventional total hip arthroplasty: a randomised controlled trial

  • We report the kinematic and early clinical results of a patient- and observer-blinded randomised controlled trial in which CT scans were used to compare potential impingement-free range of movement (ROM) and acetabular component cover between patients treated with either the navigated 'femur-first' total hip arthroplasty (THA) method (n = 66; male/female 29/37, mean age 62.5 years; 50 to 74) or conventional THA (n = 69; male/female 35/34, mean age 62.9 years; 50 to 75). The Hip Osteoarthritis Outcome Score, the Harris hip score, the Euro-Qol-5D and the Mancuso THA patient expectations score were assessed at six weeks, six months and one year after surgery. A total of 48 of the patients (84%) in the navigated 'femur-first' group and 43 (65%) in the conventional group reached all the desirable potential ROM boundaries without prosthetic impingement for activities of daily living (ADL) in flexion, extension, abduction, adduction and rotation (p = 0.016). Acetabular component cover and surface contact with the host bone were > 87% in both groups. There was a significant difference between the navigated and the conventional groups' Harris hip scores six weeks after surgery (p = 0.010). There were no significant differences with respect to any clinical outcome at six months and one year of follow-up. The navigated 'femur-first' technique improves the potential ROM for ADL without prosthetic impingement, although there was no observed clinical difference between the two treatment groups.

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Author:Tobias Renkawitz, Markus Weber, H.-R. Springorum, E. Sendtner, Michael Woerner, K. Ulm, Tim WeberORCiD, Joachim GrifkaORCiD
Parent Title (English):Journal of Bone & Joint Surgery
Document Type:Article
Year of first Publication:2015
Release Date:2020/05/12
Tag:THA; combined anteversion; computer-assisted orthopaedic surgery
GND Keyword:Hüftgelenkprothese; Operationstechnik; Computerunterstütztes Verfahren; Beweglichkeit
First Page:890
Last Page:898
Institutes:Fakultät Maschinenbau
Regensburg Center of Biomedical Engineering - RCBE
research focus:Lebenswissenschaften und Ethik