The validity and reliability of the Achilles tendon moment arm assessed with dual-energy X-ray absorptiometry, relative to MRI and ultrasound assessments

JOURNAL OF BIOMECHANICS

卷:116

Article

Buffey, Aidan J.^1,2,3  Onambele-Pearson, Gladys L.¹  Erskine, Robert M.^4,5  Tomlinson, David J.¹ 

[1] Manchester Metropolitan Univ, Musculoskeletal Sci & Sports Med Res Ctr, Manchester, Lancs, England

[2] Univ Limerick, Dept Phys Educ & Sport Sci, Limerick, Ireland

[3] Univ Limerick, Hlth Res Inst, Limerick, Ireland

[4] Liverpool John Moores Univ, Res Inst Sport & Exercise Sci, Liverpool, Merseyside, England

[5] UCL, Inst Sport Exercise & Hlth, London, England

关键词: Achilles tendon;    Moment arm;    Dual-energy X-ray absorptiometry;    Magnetic resonance imaging;    Tendon excursion;   

DOI  :  10.1016/j.jbiomech.2020.110204

来源: Elsevier

【 摘 要 】

Dual-energy X-ray absorptiometry (DXA) in single energy mode has been shown to permit the visualisation of bone and soft tissue, such as the patellar tendon through two-dimensional sagittal imaging. However, there is no validated DXA-based measurement of the Achilles tendon moment arm (dAT). The aims of this study were: 1) to compare in vivo DXA derived measurements of the dAT at rest against two previously validated methods: tendon excursion (TE) and magnetic resonance imaging (MRI) at three ankle angles (-5 degrees, 0 degrees and +10 degrees). 2) analyse the intra-day reliability of the DXA method at all ankle angles and compare between methods. Twelve healthy adults (mean SD: 31.4 +/- 9.5 years; 174.0 +/- 9.5 cm; 76. 2 +/- 16.6 kg) participated in this study, involving test-retest DXA scans, ultrasound scans and one MRI scan. The dAT was defined as the distance from the centre of the calcaneal-tibial joint axis to the Achilles tendon (AT) muscle-tendon line of action. DXA derived dAT measures were significantly greater than MRI measurements (19.7-24.9%) and were 45.2% significantly larger than the TE method. The test- retest reliability of the DXA technique at 0 degrees was high [CV = 1.38%; ICC = 0.96] and despite the consistently larger dAT lengths obtained using DXA, MRI and DEXA data were strongly correlated (r = 0.878, p < 0.001). In conclusion, the DXA technique allowed for highly reproducible in vivo dAT measurement at rest, which has implications for the calculation of AT forces in vivo and the ability to predict the measurement from one tool to the other, thereby providing a novel basis to contrast existing and future studies.

【 授权许可】

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