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. 2022 Jan 18:13:98-103.
doi: 10.1016/j.artd.2021.11.018. eCollection 2022 Feb.

Assessing Pelvic Tilt in Patients Undergoing Total Hip Arthroplasty Using Sensor Technology

Abhinav K Sharma  1 , Jonathan M Vigdorchik  2 , David A Kolin  2 , Ameer M Elbuluk  2 , Eric N Windsor  2 , Seth A Jerabek  2
Affiliations

Assessing Pelvic Tilt in Patients Undergoing Total Hip Arthroplasty Using Sensor Technology

Abhinav K Sharma et al. Arthroplast Today. .

Abstract

Background: The purpose of our study was to assess the accuracy of a commercially available wearable sensor in replicating pelvic tilt movement in both the sitting and standing position in patients before total hip arthroplasty.

Methods: This prospective study evaluated patients undergoing a primary unilateral total hip arthroplasty by a single surgeon. Patients were excluded if they had a body mass index (BMI) greater than 40 kg/m2. Two sensors were adhered directly to patients' skin at S2 and T12. The S2 angle was recorded on the sensor at maximum flexion and extension angles and compared with pelvic tilt measurements on both sitting and standing radiographs. The primary outcomes recorded were patients' pelvic tilts measured using radiographs (PT-RAD) and sensors (PT-SEN), with Pearson correlation coefficients and intraclass correlation coefficients (ICCs) calculated.

Results: Sixty-one patients (35 males and 26 females) with an average age of 61.5 ± 8.5 years and BMI of 26.9 ± 4.1 kg/m2 were analyzed. The mean prestanding PT-RAD and PT-SEN were 1.5 ± 8.3 and 1.0 ± 8.1, respectively, with an ICC of 0.98 (95% confidence interval, 0.96-0.99). The mean presitting PT-RAD and PT-SEN were -21.9 ± 12.5 and -20.9 ± 11.7, respectively, with an ICC of 0.97 (95% confidence interval, 0.95-0.98). The multiple R2 was 0.95 for the prestanding and presitting comparisons. The R2 for all comparisons between PT-RAD and PT-SEN was >0.85, regardless of BMI or sex.

Conclusions: Although the use of wearable technology may have limitations, based on our results, a wearable sensor is accurate in replicating pelvic tilt movement.

Keywords: Pelvic tilt; Total hip arthroplasty; Wearable technology.

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Conflict of interest statement

The authors declare the following financial interests/personal relationships which may be considered as potential competing interests: Jonathan M. Vigdorchik, M.D., reports stock ownership in Intellijoint Surgical and Motion Insights, receiving fees and research funding from Corin Group, and receiving fees from Intellijoint Surgical, Medacta, and Zimmer; Seth Jerabek, M.D., reports having stock ownership in Stryker and Imagen and receiving IP royalties, personal fees, and research funding from Stryker; the other authors declare no potential conflicts of interest.

Figures

Figure 1
Figure 1
Two sensors were placed, one at S2 and the other at T12, with sticky pads adhered directly to patients’ skin.
Figure 2
Figure 2
Pelvic tilt measurements on (a) standing and (b) sitting biplanar EOS images.
Figure 3
Figure 3
Correlation of prestanding sensor pelvic tilt with prestanding radiographic pelvic tilt stratified by body mass index. Equation: AA = 0.95 ∗Y -0.37; R-squared: 0.95.
Figure 4
Figure 4
Correlation of prestanding sensor pelvic tilt with prestanding radiographic pelvic tilt stratified by sex. Equation: AA = 0.95 ∗Y -0.37; R-squared: 0.95.
Figure 5
Figure 5
Correlation of presitting sensor pelvic tilt with presitting radiographic pelvic tilt stratified by body mass index. Equation: AB = 0.91∗Z-1.00; R-squared: 0.95.
Figure 6
Figure 6
Correlation of presitting sensor pelvic tilt with presitting radiographic pelvic tilt stratified by sex. Equation: AB = 0.91∗Z-1.00; R-squared: 0.95.
See this image and copyright information in PMC

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