caa a22 4500 605458081 CHVBK 20210128100227.0 cr unu---uuuuu 210128e20150301xx s 000 0 eng 10.1007/s00167-013-2720-8 doi (NATIONALLICENCE)springer-10.1007/s00167-013-2720-8 Healing of human Achilles tendon ruptures: radiodensity reflects mechanical properties [Elektronische Daten] [Thorsten Schepull, Per Aspenberg] Purpose: This study tests the idea of using radiodensity from computed tomography to quantitatively evaluate the healing of ruptured Achilles tendons. Methods: The radiodensity of the healing tendons in sixty-five patients who were treated for Achilles tendon rupture was measured. The hypothesis was that density would correlate with an estimate for e-modulus, derived from strain, measured by radiostereometry with different mechanical loadings. Results: Radiodensity 7weeks after injury was decreased to 67% (SD 11) of the contralateral, uninjured tendon. There was no improvement in radiodensity from 7 to 19weeks, whereas at 1year, it had increased to 106% (SD 7). Only 2 of 52 measured values at 1year were lower than the highest value at 19weeks, i.e. there was minimal overlap. The variation in radiodensity could explain 80% of the variation in e-modulus, but radiodensity correlated only weakly with e-modulus at each time point separately. At 1year, both radiodensity and e-modulus correlated with functional results, although weakly. Conclusions: From 19weeks onwards, radiodensity appears to reflect mechanical properties of the tendon and might to some extent predict the final outcome. Radiodensity at 7weeks is difficult to interpret, probably because it reflects both callus and damaged tissues. Level of evidence: Prospective, diagnostic study, Level II. Springer-Verlag Berlin Heidelberg, 2013 Density nationallicence CT nationallicence Modulus of elasticity nationallicence Mechanical properties nationallicence Schepull Thorsten Orthopedics, Department of Clinical and Experimental Medicine, Faculty of Health Sciences, Linköping University, 58185, Linköping, Sweden aut Aspenberg Per Orthopedics, Department of Clinical and Experimental Medicine, Faculty of Health Sciences, Linköping University, 58185, Linköping, Sweden aut Knee Surgery, Sports Traumatology, Arthroscopy Springer Berlin Heidelberg 23/3(2015-03-01), 884-889 0942-2056 23:3<884 2015 23 167 https://doi.org/10.1007/s00167-013-2720-8 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s00167-013-2720-8 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Schepull Thorsten Orthopedics, Department of Clinical and Experimental Medicine, Faculty of Health Sciences, Linköping University, 58185, Linköping, Sweden aut NATIONALLICENCE 700 1- Aspenberg Per Orthopedics, Department of Clinical and Experimental Medicine, Faculty of Health Sciences, Linköping University, 58185, Linköping, Sweden aut NATIONALLICENCE 773 0- Knee Surgery, Sports Traumatology, Arthroscopy Springer Berlin Heidelberg 23/3(2015-03-01), 884-889 0942-2056 23:3<884 2015 23 167