Imageless cup and stem navigation in dysplastic hips with the navitrack and vector vision systems

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Abstract

Total hip arthroplasty performed for developmental dysplasia of the hip has a higher incidence of complications than total hip arthroplasty for primary degenerative arthritis [8]. The poorer results appear to correlate with the severity of the hip deformity and thus with the misalignment of the hip prosthesis. With an incidence of between 1% and 10% in primary and in revision total hip replacements, dislocations and fractures are second in frequency only to aseptic loosening as a cause for revision surgery [9, 16]. Contrary to knee replacements, where deformities of the joint axis of only 10° are clinically apparent, mal-positions of one or both components of a stable, non-dislocated hip are difficult to recognize. Nevertheless, they are important factors influencing the incidence of impingement, polyethylene wear and aseptic loosening of hip endoprostheses [5, 10, 15]. In the past 10 years, computer-assisted surgery has been introduced for hip replacement [4]. The aim is even more precise placement of the prosthesis. The necessity of preoperative computed tomography (CT) scans in CT-based navigation has been a deterrent to practical application. For this reason, we have been involved in the development of the imageless navigation systems Navitrack (Orthosoft/Zimmer) and Vector Vision (Brainlab). These systems are intended to provide the surgeon with information not only about the anteversion and inclination of the cup, but also about the anteversion of the stem, changes in femoral offset and the resulting leg length. © 2007 Springer Medizin Verlag Heidelberg.

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Babisch, J., Layher, F., & Sander, K. (2007). Imageless cup and stem navigation in dysplastic hips with the navitrack and vector vision systems. In Navigation and MIS in Orthopaedic Surgery (pp. 344–351). Springer Berlin Heidelberg. https://doi.org/10.1007/978-3-540-36691-1_44

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