Takayuki Muraki1, Hiroaki Ishikawa2, Shuhei Morise2, Nobuyuki Yamamoto3, Hirotaka Sano3, Eiji Itoi3, Shin-ichi Izumi2. 1. Department of Physical Medicine and Rehabilitation, Tohoku University Graduate School of Medicine, Sendai, Japan. Electronic address: takayukimurakipt@yahoo.co.jp. 2. Department of Physical Medicine and Rehabilitation, Tohoku University Graduate School of Medicine, Sendai, Japan. 3. Department of Orthopedic Surgery, Tohoku University School of Medicine, Sendai, Japan.
Abstract
BACKGROUND: Although elasticity of the supraspinatus muscle and tendon is a useful parameter to represent the conditions of the supraspinatus muscle and tendon, assessment of the elasticity in clinical settings has not been established. The purpose of this study was to determine the elasticity of the supraspinatus muscle belly and tendon under different muscle contraction conditions using ultrasound real-time tissue elastography (RTE). METHODS: Twenty-three healthy individuals participated in this study. Ultrasound RTE was used for elasticity measurements of the muscle belly and tendon of the supraspinatus muscle. The elasticity was defined as the ratio of strain in the tissues to that in an acoustic coupler (reference). A greater ratio indicated that the tissue was softer. Measurements were performed with study subjects in the lateral decubitus position at 10° of shoulder abduction under conditions of (1) no contraction, (2) isometric contraction without a weight, and (3) isometric contraction with a 1-kg weight. RESULTS: The intraclass correlation coefficient (ICC1,3) of 3 measurements under each condition ranged from 0.931 to 0.998, showing high intraobserver reliability. Strain ratios for both the supraspinatus muscle belly and tendon significantly decreased with increases in muscle contraction (P < .001). CONCLUSIONS: Ultrasound RTE with the acoustic coupler has the potential to noninvasively detect changes in the elasticity of the supraspinatus muscle belly and tendon that accompany varying levels of muscle contraction in clinical practice.
BACKGROUND: Although elasticity of the supraspinatus muscle and tendon is a useful parameter to represent the conditions of the supraspinatus muscle and tendon, assessment of the elasticity in clinical settings has not been established. The purpose of this study was to determine the elasticity of the supraspinatus muscle belly and tendon under different muscle contraction conditions using ultrasound real-time tissue elastography (RTE). METHODS: Twenty-three healthy individuals participated in this study. Ultrasound RTE was used for elasticity measurements of the muscle belly and tendon of the supraspinatus muscle. The elasticity was defined as the ratio of strain in the tissues to that in an acoustic coupler (reference). A greater ratio indicated that the tissue was softer. Measurements were performed with study subjects in the lateral decubitus position at 10° of shoulder abduction under conditions of (1) no contraction, (2) isometric contraction without a weight, and (3) isometric contraction with a 1-kg weight. RESULTS: The intraclass correlation coefficient (ICC1,3) of 3 measurements under each condition ranged from 0.931 to 0.998, showing high intraobserver reliability. Strain ratios for both the supraspinatus muscle belly and tendon significantly decreased with increases in muscle contraction (P < .001). CONCLUSIONS: Ultrasound RTE with the acoustic coupler has the potential to noninvasively detect changes in the elasticity of the supraspinatus muscle belly and tendon that accompany varying levels of muscle contraction in clinical practice.
Authors: Luca Maria Sconfienza; Domenico Albano; Georgina Allen; Alberto Bazzocchi; Bianca Bignotti; Vito Chianca; Fernando Facal de Castro; Elena E Drakonaki; Elena Gallardo; Jan Gielen; Andrea Sabine Klauser; Carlo Martinoli; Giovanni Mauri; Eugene McNally; Carmelo Messina; Rebeca Mirón Mombiela; Davide Orlandi; Athena Plagou; Magdalena Posadzy; Rosa de la Puente; Monique Reijnierse; Federica Rossi; Saulius Rutkauskas; Ziga Snoj; Jelena Vucetic; David Wilson; Alberto Stefano Tagliafico Journal: Eur Radiol Date: 2018-06-06 Impact factor: 5.315
Authors: Timothy G Baumer; Jack Dischler; Leah Davis; Yassin Labyed; Daniel S Siegal; Marnix van Holsbeeck; Vasilios Moutzouros; Michael J Bey Journal: J Orthop Res Date: 2017-07-31 Impact factor: 3.494