Intra‐ and Inter‐rater Reliability of Navigated Ultrasound in the Assessment of Pelvic Tilt in Symptom‐Free Young Adults

Marques, Carlos J.; Martín, Tobías; Fiedler, F; Weber, Max; Breul, Viktor; Lampe, Frank; Kozák, Josef

doi:10.1002/jum.14581

Cited by 10 publications

(16 citation statements)

References 19 publications

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“…While intra-rater reliability values were good, inter-rater reliability remained below acceptable marks [16], showing that both raters were probably locating the bony landmarks differently. Differences in localizing the right and left ASIS could have led to these discrepancies.…”

Section: Discussionmentioning

confidence: 99%

“…An ultrasound device is connected to the central unit via universal serial bus (USB) The intra-rater reliability of the system when measuring PT angles was good to excellent and moderate to excellent for the supine and upright positions, respectively. Inter-rater reliability remained below the expected values, probably due to the imaging protocols, which were probably not described with enough detail [16].…”

Section: Measurement Systemmentioning

confidence: 99%

“…The data used to investigate the research question was originally collected to investigate the intra-and inter-rater reliability of the smartphone-based navigated ultrasound system used as measurement tool [16]. The study used a repeated measures design.…”

Section: Methodsmentioning

confidence: 99%

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The Effects of Body Position on Pelvic Tilt Angles Measured with a Smartphone-Based Navigated Ultrasound System in Symptom-Free Young Adults

Marques

Martín

Fiedler

et al. 2018

JFMK

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Abstract:The study aimed to investigate whether pelvic tilt (PT) angles differ between the supine and upright position in symptom-free young adults. Additionally, the concurrent validity of the measurement system was tested on a pelvis phantom against a digital inclinometer. A new smartphone-based navigated ultrasound system was used to perform the measurements. The sample consisted of 12 symptom-free young adults. A multivariate regression model was used to analyze the data. The subjects' pelvis in supine position was significantly more tilted anteriorly (mean PT = −7.3 • , 95% C.I.: −10.6 to −3.9) than in upright position (mean PT = 0.8 • , 95% C.I.: −2.5 to 4.1) (mean. diff. 8.1 • ; p < 0.001). Rater and trial order had no significant effects on the measured PT angles (p = 0.5). The accuracy of the system when measuring PT angles on the pelvis phantom was 0.3 • (0.1 • to 0.7 • ) and 0.2 • (−0.09 • to 0.6 • ) for the supine and upright positions respectively. Pelvic tilt angles differed significantly between the supine and the upright position in symptom-free young adults. Concurrent validity showed no differences for measurements in the upright position and small (under 0.4 • ) significant differences for measurements in the supine position.

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Section: Discussionmentioning

confidence: 99%

Section: Measurement Systemmentioning

confidence: 99%

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The Effects of Body Position on Pelvic Tilt Angles Measured with a Smartphone-Based Navigated Ultrasound System in Symptom-Free Young Adults

Marques

Martín

Fiedler

et al. 2018

JFMK

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“…The data used for the present purpose was collected during two studies with the use of the same measurement system. One study investigated the intra- and inter-rater reliability of a navigated ultrasound system in the assessment of PT in Symptom-Free Young Subjects (SFYS) [ 18 ]. The second study assessed PT in patients scheduled for THA [ 17 ].…”

Section: Methodsmentioning

confidence: 99%

“…In view of the above-referred findings the data of two previous studies [ 17 , 18 ] were treated in a secondary data analysis. The aim was to test for factors that significantly affect PT angles.…”

Section: Introductionmentioning

confidence: 99%

Pelvic Tilt Angle Differences Between Symptom-Free Young Subjects and Elderly Patients Scheduled for THA: The Rationale for Tilt-Adjusted Acetabular Cup Implantation

Marques¹,

Martín²,

Kochman³

et al. 2018

TOORTHJ

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Background:The question whether Pelvic Tilt (PT) angles measured in the supine position are adequate for the alignment of the acetabular cup without an adjustment for anatomical differences between patients is of clinical importance. The aim of this work was to test for factors that can significantly affect PT angles.Methods:In the present retrospective cohort comparison, the PT angles of 12 Symptom-Free Young Subjects (SFYS) and 45 patients scheduled for Total Hip Arthroplasty (THA) were compared. The data was collected during two studies with the use of a novel smartphone-based navigated ultrasound measurement system. Multi-factorial analysis of variance was run to determine which factors significantly affect PT.Results:Body position (F= 126.65; P< 0.001) and group (SFYS vs. THA patients) (F= 17.52; P< 0.001) had significant main effects on PT. There was also a significant interaction between body position and group (F= 25.59; P< 0.001). The mean PT increased by 8.1° from an interiorly to a neutral tilted position (P< 0.001) and 21.4° from a neutral to a posteriorly tilted position (P< 0.001) with the transition from the supine into the upright position for the SFYS and THA patients, respectively.Conclusion:In both groups, PT changed significantly with a transition from the supine to the upright position. A position-dependent mean PT increase in the patient group showed that acetabular cup alignment based on PT in the supine position is not reliable without taking into consideration the inclination of the pelvis in standing position. This may lead to instability and dislocations.

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Implications of the uncertainty of postoperative functional parameters for the preoperative planning of total hip arthroplasty

Fischer

Tokunaga

Okamoto

et al. 2022

Journal Orthopaedic Research

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The functional parameters pelvic tilt (PT) and hip joint force (HJF) are required to calculate patient‐specific target zones based on the range of motion (ROM) and implant loading for preoperative planning of total hip arthroplasty (THA). Both functional parameters may change after THA. The preoperative prediction of the postoperative PT and HJF is associated with a specific amount of uncertainty. The prediction uncertainty has to be considered in the preoperative planning process to avoid a suboptimal implantation. So far, very little attention has been paid to the necessary reduction of patient‐specific target zones by the prediction uncertainties of postoperative functional parameters. Prediction models for the postoperative PT in standing position and for the HJF during one‐leg stance as a surrogate for the peak force phase during level walking were used to quantify the reduction of the ROM‐ and load‐based target zones of 196 Japanese THA patients. The prediction uncertainty was about 14° for the postoperative standing PT and ranged from 17% body weight to 37% body weight for the components of the HJF. On average, the prosthetic ROM‐based target zone had to be significantly reduced by 43% and the load‐based target zone by 39%. This led to a median reduction of the combined prosthetic ROM‐ and load‐based target zone of 96%. The study sharpens the awareness for the substantial reduction of ROM‐ and load‐based target zones by prediction uncertainties of the postoperative PT and HJF and highlights the importance of further research to improve prediction models for both functional parameters.

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Intra‐ and Inter‐rater Reliability of Navigated Ultrasound in the Assessment of Pelvic Tilt in Symptom‐Free Young Adults

Abstract: The intra-rater reliability values achieved were suitable. Intraclass correlation coefficient values for inter-rater reliability remained below an acceptable level. Possible reasons and overcoming strategies were presented. The 95% limits of agreement were good, at less than ±2°.

Cited by 10 publications

References 19 publications

The Effects of Body Position on Pelvic Tilt Angles Measured with a Smartphone-Based Navigated Ultrasound System in Symptom-Free Young Adults

The Effects of Body Position on Pelvic Tilt Angles Measured with a Smartphone-Based Navigated Ultrasound System in Symptom-Free Young Adults

Pelvic Tilt Angle Differences Between Symptom-Free Young Subjects and Elderly Patients Scheduled for THA: The Rationale for Tilt-Adjusted Acetabular Cup Implantation

Implications of the uncertainty of postoperative functional parameters for the preoperative planning of total hip arthroplasty

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