Naslov
Shear-wave sonoelastography evaluation of Achilles tendons after surgery

Autori
Ivanac, Gordana ; Lemac, Domagoj ; Čavka, Mislav ; Brkljačić, Boris

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
European Congress of Radiology: abstracts / - , 2012, C-1507

Skup
European Congress of Radiology

Mjesto i datum
Beč, Austrija, 01.03.2012. - 05.03.2012

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Musculoskeletal soft tissue; Ultrasound; Diagnostic procedure; Athletic injuries

Sažetak
Elastography is a new dynamic technique that uses ultrasound to estimate the stiffness of tissues by measuring the degree of distortion under application of external force. Elastography has been mostly applied in studies of liver and breast pathology and most elasography techniques utilize external compression. Shear wave elastography (SWE) generates, captures and quantifies velocity of the shear wave and enables quantitative analysis of lesion elasticity by producing real-time quantitative color coded map of local tissue elasticity. In our study sonoelastographic features of Achilles tendons after surgery were compared with healthy contralateral tendons using SWE.Fourteen patients (average age 44 years) with complete Achilles tendon rupture were examined by single physician 7-79 months (mean 35.4) after surgery by B-mode, color-Doppler, and shear- wave sonoelastography (Supersonic Aixplorer scanner, linear 15 MHz transducer). Findings were compared to normal contralateral tendons. Tendon thickness was measured, degree of vascularisation was evaluated and resistance- index (RI) measured when possible. Elastographic patterns were cathegorized qualitatively into four groups: 1) completely blue ; 2) inhomogeneous, mixed blue and red (Fig. 2) ; 3) predominantly red ; 4) completely red – stiff (Fig. 1). Maximum, minimum and mean elasticity values in kPa were measured. Tendons were divided into thirds. Healthy tendons demonstrated no vascularisation, their thickness was 4.5-5.4 mm (proximal to distal third), and elastographic patterns were in the 3.5-3.7 range. Mean elasticity values for distal, middle and proximal third in kPa were 258.9±17.7 ; 250±18.4 ; 191.8±19.8. Operated tendons had visible vascularisation in 4/14 (29%) patients with average RI of 0.52 (Fig. 3) ; their thickness was 11-13.5 mm and elastographic pattern was cathegorized as 1.9. Mean elasticity values in kPa for distal, middle and proximal third were 212±20.8 ; 190±18.8 ; 182±22 in stiff parts and 60±9.1 ; 7.2±4 ; 35±15.3 in elastic parts of operated tendons. We used small parts preset for SWE stadies of breast as well as for musculoskeletal stadies since we obtanied very good B- mode quality of images. However using musculoskeletal preset we noted that elasticity values in kPa for healthly tendons are higher and we will further stady the effect of various scanner presets on measured values obtained. Tendons after surgery demonstrate reduced stiffness compared to normal contralateral tendons. They are also significantly thicker, and sometimes vascularized with low- resistance waveforms. Shear-wave elastography can be used in addition to conventional and Doppler ultrasound to follow patients after Achilles tendon surgery.

Izvorni jezik
Engleski

Znanstvena područja
Kliničke medicinske znanosti

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