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Intermachine Variation of Ultrasound Strain Elastographic Measures of the Quadriceps and Patellar Tendons in Healthy Participants
Author(s) -
Dickson Diane M.,
Fawole Henrietta O.,
Hendry Gordon J.,
Smith Stephanie L.
Publication year - 2020
Publication title -
journal of ultrasound in medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 91
eISSN - 1550-9613
pISSN - 0278-4297
DOI - 10.1002/jum.15228
Subject(s) - medicine , repeatability , intraclass correlation , wilcoxon signed rank test , ultrasound , patellar tendon , coefficient of variation , elastography , nuclear medicine , rank correlation , physical therapy , tendon , orthodontics , surgery , mann–whitney u test , radiology , statistics , mathematics , clinical psychology , psychometrics
Objectives To evaluate intermachine variation and compare intraoperator and interoperator agreement and repeatability characteristics of 2 ultrasound (US) systems for measurements of quadriceps and patellar tendons by strain elastography (SE). Methods Forty tendons from 20 healthy participants were investigated by operators with different experience (operator 1, 12 years of US experience and >50 SE examinations; operator 2, no US experience and 1 day of SE training). Repeated measures were performed on GE Healthcare (Waukesha, WI) and Esaote (Genoa, Italy) US systems. The percentage of agreement, Cohen κ, intraclass correlation coefficient, and correlation tests assessed agreement, repeatability, and associations of SE measures. A paired t test and Wilcoxon signed rank test assessed differences in SE measures. Results The study participants included 5 male and 15 female volunteers (mean [range] age, 29.3 [21–39] years). Better agreement and repeatability characteristics were observed for the patellar compared to the quadriceps tendon and the color score (CS) method over the elasticity ratio (ER). Intraoperator agreement was better for the experienced operator. Intraoperator repeatability was achieved in 55% of ER (intraclass correlation coefficient, 0.40–0.91; P < .05) and 77% to 85% (κ = –0.25–1) of CS measures. Interoperator repeatability was achieved in 35% ( t / z , –2.93–7.94; P < .001–.048) of all ER measures. No significant differences in proximal ( z , –0.13– –0.78) and distal patellar ( z , –1.52–2.26; P > .5) patellar ER measures were observed. Seventy‐four percent to 75% mean agreement (κ = 0–0.5) for CS measures comparable across both US systems was observed. Intermachine ER associations were poor ( r = –0.39–0.13; P > .05), whereas greater than 70% agreement (κ = –0.87–0.53) for the CS was achieved. Conclusions The reproducibility of knee tendon SE measurements is influenced by the operator experience, US system, and tendon site.