Novel Measure of Acetabular Cup Inclination and Anteversion During Total Hip Arthroplasty

Abstract

Purpose The purposes of the present research were to assess the accuracy and usability of the inertial navigation system (INS). Materials and Methods The accuracy of the device navigation subsystem was assessed using benchtop testing. The usability was assessed through simulated use with surgeons. These results were compared to recent cadaveric results for the same system. Results The navigation subsystem had an overall mean absolute error of 1.21° and a maximum absolute error across all devices of 4.79°. The device was found to be usable and to add an estimated 7 minutes to surgery time. Conclusion The INS uses a novel approach to provide the surgeon with accurate and fast acetabular cup inclination and anteversion angles during THA.

Achieving Precise Cup Positioning in Direct Anterior Total Hip Arthroplasty: A Narrative Review

“…A cadaveric study by Shatrov et al found a difference of 2.3° for acetabular version when comparing the devices measurements to postoperative CT-scans [ 61 ]. Accuracy for cup positioning with the device seems to be good and the registration method using the table tilt has been validated [ 60 , 61 ]. However, the literature on this technique is very limited and it needs to be validated in larger cohorts of living patients.…”

“…The operating table then needs to be tilted in a certain sequence; thereby, the system defines the reference axes that serve as a coordinate system. The literature on this device is limited to a few cadaveric studies [ 60 , 61 ].…”

Combining inertial navigation with transacetabular ligament in total hip arthroplasty via direct anterior approach results in excellent accuracy compared to standard manual technique

“…As of the 27th of May 2021, the principal investigator consistently used an inertial imageless navigation device (Navbit Ò ) (NAV cohort). The same technique of registration was used as previously described by Walter et al [14] with one exception as the device was being used on the ipsilateral side instead of the contralateral side (Figure 2).…”

“…To date, there has been a low use of navigation in THA procedures [12]. Inertial imageless navigation devices were introduced to avoid some of these problems as they are easy to use, had no radiation exposure, and were sterile in use [13,14]. This way, a patient can be located in a 3-dimensional space by just tilting the operating table (table tilt method), resulting in a functional baseline to the operating table (coronal plane).…”

“…This way, a patient can be located in a 3-dimensional space by just tilting the operating table (table tilt method), resulting in a functional baseline to the operating table (coronal plane). This functional coronal plane is similar to the reference plane used when measuring acetabular angles on a standard supine anteroposterior radiograph [14].…”