Comparison of total hip replacements cup orientation and position using different navigation systems and the conventional manual technique

Background. Aim of this in-vitro study was to compare the hip cup placement for total hip replacement when using different navigation systems compared with the traditional, non-navigated technique. Methods. Five different navigation systems were used: the CT-less systems Navitrack™, Orthopilot™ and Surgetics Station™, as well as the CT-based Navitrack™ and VectorVision™. Three different surgeons carried out five cup implantations using all navigation systems and the manual approach on a surgery dummy. Cup orientation (inclination and anteversion) and the cup position (achieved cup center) were determined with a coordinate measuring machine. Results. In the manual group the variability of the cup orientation was higher in comparison and hardly influenced by the surgeon. Navigation was identified as a significant factor for smaller deviations from planned inclination and anteversion angles (p<0,001 for both). Cup position was not affected by surgeon in the manual group (p=0,966). Compared with manual technique, the cup misplacement vector was significantly smaller in the CT-Navitrack group (p<0,001) but higher in the Navitrack (CT-less) and VectorVision group (p<0,001). Conclusions. The use of computer navigation will help the surgeon to orientate the acetabular component more accurately but not necessarily with regard to cup positioning. © Springer Medizin Verlag 2005.

Subjects

Cup positioning

Endoprothesis

Navigation systems

Total hip replacement

DDC Class

610: Medicine, Health

620: Engineering

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Comparison of total hip replacements cup orientation and position using different navigation systems and the conventional manual technique