Portable imageless navigation system and surgeon’s estimate for accurate evaluation of acetabular cup orientation during total hip arthroplasty in supine position

2020 ◽  
Vol 30 (4) ◽  
pp. 707-712 ◽  
Author(s):  
Ryohei Takada ◽  
Tetsuya Jinno ◽  
Kazumasa Miyatake ◽  
Masanobu Hirao ◽  
Toshitaka Yoshii ◽  
...  
Keyword(s):  
Total Hip Arthroplasty ◽  
Hip Arthroplasty ◽  
Supine Position ◽  
Navigation System ◽  
Acetabular Cup ◽  
Accurate Evaluation ◽  
Total Hip ◽  
Imageless Navigation

Measuring leg length and offset with an imageless navigation system during total hip arthroplasty: is it really accurate?

2009 ◽  
Vol 5 (2) ◽  
pp. 192-197 ◽  
Author(s):  
Tobias Renkawitz ◽  
Tibor Schuster ◽  
Thomas Herold ◽  
Holger Goessmann ◽  
Ernst Sendtner ◽  
...  
Keyword(s):  
Total Hip Arthroplasty ◽  
Hip Arthroplasty ◽  
Navigation System ◽  
Leg Length ◽  
Total Hip ◽  
Imageless Navigation

Comparison of accuracy of cup position using portable navigation versus alignment guide in total hip arthroplasty in supine position

2020 ◽  
pp. 112070002090878 ◽  
Author(s):  
Masanori Okamoto ◽  
Masashi Kawasaki ◽  
Toshiaki Okura ◽  
Satoshi Ochiai ◽  
Hiroyuki Yokoi
Keyword(s):  
Total Hip Arthroplasty ◽  
Hip Arthroplasty ◽  
Supine Position ◽  
Navigation System ◽  
Direct Anterior Approach ◽  
Navigation Systems ◽  
Total Hip ◽  
Navigation Group ◽  
Portable Navigation ◽  
Alignment Guide

Background: Accelerometer-based portable navigation systems in supine total hip arthroplasty (THA) have been developed, but there are no reports on the accuracy of cup placement. We aimed to investigate and compare the accuracy of the accelerometer-based portable navigation system versus the acetabular alignment guide placed on the pelvis in THA using the direct anterior approach (DAA). Both devices tracked changes in the pelvic position. Methods: In this single-centre, retrospective study, we reviewed 115 hips in 113 patients who underwent primary THA via the DAA using an accelerometer-based portable navigation system in the supine position (portable navigation group) and 106 hips in 101 patients who underwent THA using an acetabular alignment guide (alignment guide group) as controls. Hips were evaluated postoperatively using computed tomography to measure cup orientation. The accuracy of cup orientation was compared between the 2 groups. Results: Absolute values of inclination error were 3.1° ± 2.2° and 2.9° ± 2.3° ( p = 0.708) in the portable navigation and alignment guide groups and those of anteversion error were 2.8° ± 2.3° and 3.7° ± 2.7°, respectively ( p = 0.005). The number of cups placed within 10° of error was 98.3% and 96.2% in the portable navigation and alignment guide groups, respectively ( p = 0.304). The portable navigation group had significantly more hips (72.2%) placed within a 5° margin of error than did the alignment guide group (56.6%) ( p = 0.016). Conclusion: High accuracy in cup placement was achieved using accelerometer-based portable navigation in supine THA. Using a navigation system may contribute to improved long-term outcomes.

scholarly journals Accuracy of cup orientation and learning curve of the accelerometer-based portable navigation system for total hip arthroplasty in the supine position

2019 ◽  
Vol 27 (2) ◽  
pp. 230949901984887 ◽  
Author(s):  
Tomoyuki Kamenaga ◽  
Shinya Hayashi ◽  
Shingo Hashimoto ◽  
Tomoyuki Matsumoto ◽  
Koji Takayama ◽  
...  
Keyword(s):  
Total Hip Arthroplasty ◽  
Learning Curve ◽  
Hip Arthroplasty ◽  
Supine Position ◽  
Navigation System ◽  
Total Hip ◽  
Portable Navigation

scholarly journals Validity of intraoperative imageless navigation (Naviswiss) for component positioning accuracy in primary total hip arthroplasty: protocol for a prospective observational cohort study in a single-surgeon practice

BMJ Open ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. e037126
Author(s):  
Nalan Ektas ◽  
Corey Scholes ◽  
Alejandro M Ruiz ◽  
John Ireland
Keyword(s):  
Cohort Study ◽  
Total Hip Arthroplasty ◽  
Hip Arthroplasty ◽  
Navigation System ◽  
Observational Cohort Study ◽  
Prospective Observational Cohort Study ◽  
Leg Length ◽  
Total Hip ◽  
Imageless Navigation ◽  
Observational Cohort

IntroductionOptimal outcomes in total hip arthroplasty (THA) are dependent on appropriate placement of femoral and acetabular components, with technological advances providing a platform for guiding component placement to reduce the risk of malpositioned components during surgery. This study will validate the intraoperative data captured using a handheld imageless THA navigation system against postoperative measurements of acetabular inclination, acetabular version, leg length and femoral offset on CT radiographs.Methods and analysisThis is a prospective observational cohort study conducted within a single-centre, single-surgeon private practice. Data will be collected for 35 consecutive patients (>18 years) undergoing elective THA surgery, from the research registry established at the surgeon’s practice. The primary outcome is the agreement between intraoperative component positioning data captured by the navigation system compared with postoperative measurements using CT. A total of ten CT scans will be reassessed for interobserver and intraobserver reliability. The influence of patient and surgical factors on the accuracy of component position will also be examined with multivariable linear regression.Ethics and disseminationEthics approval for this study was provided through a certified ethics committee (Bellberry HREC approval number 2017-07-499). The results of this study will be disseminated through peer-reviewed journals and conference presentations.Trial RegistrationAustralian and New Zealand Clinical Trials Registry (ANZCTR) Trial ID: ACTRN12620000089932.

scholarly journals An accelerometer-based navigation system provides acetabular cup orientation accuracy comparable to that of computed tomography-based navigation during total hip arthroplasty in the supine position

2019 ◽  
Author(s):  
Tomonori Tetsunaga ◽  
Kazuki Yamada ◽  
Tomoko Tetsunaga ◽  
Tomoaki Sanki ◽  
Yoshi Kawamura ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Total Hip Arthroplasty ◽  
Hip Arthroplasty ◽  
Supine Position ◽  
Polyethylene Wear ◽  
Anterolateral Approach ◽  
Navigation Systems ◽  
Acetabular Cup ◽  
Total Hip ◽  
Significant Difference

Abstract Background: Inadequate acetabular component orientation is associated with postoperative impingement, dislocation, and accelerated polyethylene wear. Computed tomography (CT)-based navigation systems provide accuracy for total hip arthroplasty (THA) but are not available in all facilities. Accelerometer-based navigation systems are inexpensive, but their accuracy remains undetermined. This study compares the accuracy of cup orientation in THA using CT-based and accelerometer-based navigation systems. Methods: This retrospective study included 35 consecutive patients (11 males, 24 females; mean age, 65 years) who underwent primary cementless THA via an anterolateral approach in the supine position. Both CT-based and accelerometer-based navigation systems were used simultaneously. The accuracy of cup orientation was compared between the two systems using postoperative CT. Results: The accuracy of cup inclination was 2.7° ± 2.0° in the CT-based group and 3.3° ± 2.4° in the accelerometer-based group. The accuracy of cup anteversion was 2.8° ± 2.6° in the CT-based group and 3.4° ± 2.2° in the accelerometer-based group. No significant difference was observed in cup inclination ( p = 0.29) or cup anteversion ( p = 0.34) between CT-based and accelerometer-based navigation. Conclusions: The accuracy of cup positioning did not differ significantly between CT-based and accelerometer-based navigation systems.

scholarly journals The Accuracy And Influencing Factors of An Accelerometer-Based Portable Navigation System For Total Hip Arthroplasty In The Supine Position : A Prospective Multicenter Study Using 3D CT Measurement

2021 ◽  
Author(s):  
Yukihide Minoda ◽  
Masayuki Ito ◽  
Kentaro Iwakiri ◽  
Katsufumi Uchiyama ◽  
Masashi Kawasaki ◽  
...  
Keyword(s):  
Total Hip Arthroplasty ◽  
Hip Arthroplasty ◽  
Supine Position ◽  
Navigation System ◽  
Pelvic Tilt ◽  
Intraoperative Navigation ◽  
3D Ct ◽  
Pelvic Rotation ◽  
Total Hip ◽  
Portable Navigation

Abstract This multicenter prospective study aimed to evaluate the accuracy of a newly introduced accelerometer-based portable navigation system for total hip arthroplasty (THA) in the supine position. Three hundred twenty-four THAs using supine position in 9 hospitals were prospectively enrolled in the study. An accelerometer-based portable navigation system was used for cup fixation and the intraoperative navigation data (cup alignment, pelvic tilt, and pelvic rotation) were recorded. Postoperative cup alignment was measured on 3D-CT images. The accuracy (absolute difference in cup alignment between the intraoperative navigation record and postoperative 3D-CT measurements) was 3 ± 3° (mean ± standard deviation) for cup inclination and 3 ± 3° for cup anteversion. The pelvis tilted anteriorly in 148 hips (46%) and posteriorly in 162 hips (50%), and did not tilt in 14 hips (4%). The pelvis rotated toward the operating side in 179 hips (55%), toward the contralateral side in 112 hips (35%), and did not rotate in 33 hips (10%). Multiple regression analysis showed that the patients’ characteristics, pelvic tilt, and pelvic rotation did not affect the accuracy of the navigation system. The accuracy was 3 ± 3° and not affected by patient characteristics, surgical factors, or substantial pelvic movement during cup fixation.

scholarly journals Which one is more affected by navigation-assisted cup positioning in total hip arthroplasty: Anteversion or inclination? A retrospective matched-pair cohort study in Asian physique

2018 ◽  
Vol 26 (2) ◽  
pp. 230949901878075 ◽  
Author(s):  
Kwang Jun Oh ◽  
Byung Kag Kim ◽  
Myung Il Jo ◽  
Byung Mun Ahn
Keyword(s):  
Total Hip Arthroplasty ◽  
Hip Arthroplasty ◽  
Matched Pair ◽  
Mean Deviation ◽  
Acetabular Cup ◽  
Total Hip ◽  
Imageless Navigation ◽  
Significant Difference ◽  
Matching Criteria ◽  
Cup Positioning

Introduction: The purpose of this study was to compare acetabular cup positioning using an imageless navigation-assisted total hip arthroplasty (THA) to a case-matched control group using the conventional technique in Asian physique. Methods: Case matching controlled study using retrospectively collected data for THAs was done. Matching criteria were gender, age ± 5 years, and body mass index ± 5 kg/m2. Thirty patients who had navigation THAs were manually matched to a conventional group of 30 patients. After measuring anteversion and inclination on 3-D CT, final cup anteversion was calculated using the mathematical formula (anteversion = arctan [tan (anatomic anteversion) × sin (inclination)]). Results: No significant difference was observed between mean inclination ( p = 0.420), anteversion ( p = 0.697), and the mean deviation from 15° for anteversion ( p = 0.649). However, there was a statistical significant difference for mean deviation from 40° for inclination ( p = 0.027). There was a significant difference in the percentage of correctly placed acetabular cup in safe zones with inclination ( p = 0.039). Conclusions: Although soft tissue overlying the pubic tubercle interfered with registration of the bony landmark and thereby induced inaccuracy of anteversion angles in the navigation group, the use of imageless navigation-assisted technique increases the placement within the safe zone for inclination and enhances the accuracy and the precision of inclination of the acetabular cup relative to the conventional THA rather than anteversion. This finding may be due to the effect of the patient’s physique on the anterior pelvic plane (APP)-based reference system of imageless navigation.

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