caa a22 4500 605460310 CHVBK 20210128100238.0 cr unu---uuuuu 210128e20150201xx s 000 0 eng 10.1007/s00167-013-2475-2 doi (NATIONALLICENCE)springer-10.1007/s00167-013-2475-2 Partial supraspinatus tears are associated with tendon lengthening [Elektronische Daten] [Nadja Farshad-Amacker, Florian Buck, Mazda Farshad, Christian Pfirrmann, Christian Gerber] Purpose: Tendon tear may result in muscular retraction with the loss of contractile amplitude and strength of the rotator cuff muscles. Currently, neither a validated method of measuring supraspinatus tendon length nor normal values are known. It was therefore the purpose of this study to measure the normal length of the supraspinatus tendon and to determine whether partial tears are associated with changes in tendon length. Methods: MR examinations of 49 asymptomatic volunteers and 37 patients with arthroscopically proven, isolated partial tears of the supraspinatus tendon were compared. The ratio of the extramuscular tendon length to the distance between the footprint and the glenoid surface was calculated (TL/FG ratio). Tendon length measurements were taken by two independent readers at the bursal and articular surfaces at the anterior, the central and the posterior parts of the tendon. Results: TL/FG ratios at the bursal surface of tendons with partial tears were significantly higher than those in the control group [anterior: 0.78±0.20 vs. 0.66±0.15 (p<0.05); central: 0.61±0.13 vs. 0.52±0.10 (p<0.05); posterior: 0.57±0.15 vs. 0.52±0.10 (p<0.05)]. At the articular surface, differences were significant only anteriorly [0.60±0.13, vs. 0.54±0.10 (p<0.05)]. A cut-off TL/FG ratio of 0.63 for measurements at the bursal surface in the center of the tendon achieved a sensitivity of 46% and a specificity of 92% for the identification of partial cuff tearing. Conclusion: A reproducible method for measurement of extramuscular supraspinatus tendon length is described. Partial tearing of the supraspinatus tendon is associated with significant tendon lengthening, suggesting failure in continuity, and this is most reliably measured on the bursal surface. Level of evidence: III. Springer-Verlag Berlin Heidelberg, 2013 Supraspinatus nationallicence Tendon nationallicence Partial tears nationallicence Tendon length nationallicence Rotator cuff tear nationallicence Farshad-Amacker Nadja Division of Radiology, Balgrist University Hospital, University of Zurich, Forchstrasse 340, 8008, Zurich, Switzerland aut Buck Florian Division of Radiology, Balgrist University Hospital, University of Zurich, Forchstrasse 340, 8008, Zurich, Switzerland aut Farshad Mazda Department of Orthopaedics, Balgrist University Hospital, University of Zurich, Forchstrasse 340, 8008, Zurich, Switzerland aut Pfirrmann Christian Division of Radiology, Balgrist University Hospital, University of Zurich, Forchstrasse 340, 8008, Zurich, Switzerland aut Gerber Christian Department of Orthopaedics, Balgrist University Hospital, University of Zurich, Forchstrasse 340, 8008, Zurich, Switzerland aut Knee Surgery, Sports Traumatology, Arthroscopy Springer Berlin Heidelberg 23/2(2015-02-01), 408-414 0942-2056 23:2<408 2015 23 167 https://doi.org/10.1007/s00167-013-2475-2 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/s00167-013-2475-2 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Farshad-Amacker Nadja Division of Radiology, Balgrist University Hospital, University of Zurich, Forchstrasse 340, 8008, Zurich, Switzerland aut NATIONALLICENCE 700 1- Buck Florian Division of Radiology, Balgrist University Hospital, University of Zurich, Forchstrasse 340, 8008, Zurich, Switzerland aut NATIONALLICENCE 700 1- Farshad Mazda Department of Orthopaedics, Balgrist University Hospital, University of Zurich, Forchstrasse 340, 8008, Zurich, Switzerland aut NATIONALLICENCE 700 1- Pfirrmann Christian Division of Radiology, Balgrist University Hospital, University of Zurich, Forchstrasse 340, 8008, Zurich, Switzerland aut NATIONALLICENCE 700 1- Gerber Christian Department of Orthopaedics, Balgrist University Hospital, University of Zurich, Forchstrasse 340, 8008, Zurich, Switzerland aut NATIONALLICENCE 773 0- Knee Surgery, Sports Traumatology, Arthroscopy Springer Berlin Heidelberg 23/2(2015-02-01), 408-414 0942-2056 23:2<408 2015 23 167