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. 2022 Jun 4;23(1):537.
doi: 10.1186/s12891-022-05495-3.

Accuracy of a novel accelerometer-based navigation (Naviswiss) for total hip arthroplasty in the supine position

Masahiro Hasegawa  1 , Yohei Naito  2 , Shine Tone  2 , Akihiro Sudo  2
Affiliations

Accuracy of a novel accelerometer-based navigation (Naviswiss) for total hip arthroplasty in the supine position

Masahiro Hasegawa et al. BMC Musculoskelet Disord. .

Abstract

Background: This study aimed to determine the accuracy of acetabular cup insertion using a novel accelerometer-based navigation system in total hip arthroplasty (THA).

Methods: A single-surgeon study was conducted in which 62 prospective patients with navigation and 42 retrospective patients without navigation in a supine position were compared. Absolute values for errors of radiographic inclination and anteversion were calculated. Navigation error was also calculated. Factors that affected absolute value of navigation error in cup alignment were determined.

Results: In the navigation group, mean absolute errors for radiographic inclination and anteversion were 4.1° and 4.3°, respectively. In the control group, mean absolute errors were 6.6° in inclination (p < 0.01) and 5.9° in anteversion (p = 0.04). Mean absolute values of navigation error were 2.8° in inclination and 2.8°in anteversion. Factors affecting navigation errors were not found.

Conclusion: This novel accelerometer-based navigation system significantly increased the accuracy of cup placement during THA in the supine position.

Keywords: Accelerometer; Acetabular cup; Navigation; Supine position; Total hip arthroplasty.

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Conflict of interest statement

MH is a member of the editorial board (Associate Editor) of this journal. Other authors declare that they have no competing interests.

Figures

Fig. 1
Fig. 1
A Cup insertion with the direct anterior approach (DAA). B Cup insertion with the anterolateral supine approach (ALS). Navigation tags are attached to fixation pins at the pelvis and cup inserter
Fig. 2
Fig. 2
The Naviswiss monitor after cup insertion showing 40° of inclination and 15° of anteversion
Fig. 3
Fig. 3
Scatter plot of absolute value of navigation error in radiographic inclination and anteversion
See this image and copyright information in PMC

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