caa a22 4500 605460094 CHVBK 20210128100237.0 cr unu---uuuuu 210128e20150201xx s 000 0 eng 10.1007/s00167-013-2542-8 doi (NATIONALLICENCE)springer-10.1007/s00167-013-2542-8 Supraspinatus tendon and subacromial space parameters measured on ultrasonographic imaging in subacromial impingement syndrome [Elektronische Daten] [Lori Michener, Sevgi Subasi Yesilyaprak, Amee Seitz, Mark Timmons, Matthew Walsworth] Purpose: To characterize the supraspinatus tendon thickness, subacromial space, and the relationship between tendon thickness and subacromial space to further elucidate the mechanisms of subacromial impingement syndrome. Methods: In a single-blind cross-sectional study, subjects were recruited with subacromial impingement syndrome (n=20) and asymptomatic controls (n=20) matched for age, gender, and hand dominance. Ultrasound images were collected using a 4-12-MHz linear transducer in B-mode of the supraspinatus tendon in the transverse (short axis) and the anterior aspect of the subacromial space outlet. Using image callipers, measurements of tendon thickness were taken at 3 points along the tendon and averaged for a single thickness measure. The subacromial space outlet was measured via the acromiohumeral distance (AHD) defined by the inferior acromion and superior humeral head. The occupation ratio was calculated as the tendon thickness as a percentage of AHD. Results: The subacromial impingement syndrome group had a significantly thicker tendon (mean difference=0.6mm, p=0.048) and a greater tendon occupation ratio (mean difference=7.5%, p=0.014) compared to matched controls. There were no AHD group differences. Conclusions: The supraspinatus tendon was thicker and occupied a greater percentage of AHD, supporting an intrinsic mechanism. An extrinsic mechanism of tendon compression is theoretically supported, but future imaging studies need to confirm direct compression with elevation. Treatment to reduce tendon thickness may reduce symptoms, and surgical intervention to increase subacromial space may be considered if tendon compression can be verified. Springer-Verlag Berlin Heidelberg, 2013 Rotator cuff disease nationallicence Impingement syndrome nationallicence Shoulder nationallicence Tendon nationallicence Subacromial space nationallicence Michener Lori COOR Laboratory, Department of Physical Therapy, Virginia Commonwealth University, Rm 100, West Hospital Basement, 23298, Richmond, VA, USA aut Subasi Yesilyaprak Sevgi School of Physical Therapy and Rehabilitation, Dokuz Eylül University, Izmir, Turkey aut Seitz Amee Physical Therapy Department, Bouve College of Health Science, Northeastern University, 02127, Boston, MA, USA aut Timmons Mark COOR Laboratory, Department of Physical Therapy, Virginia Commonwealth University, Rm 100, West Hospital Basement, 23298, Richmond, VA, USA aut Walsworth Matthew Department of Radiology, University of California Los Angeles, 757 Westwood Boulevard, 90095, Los Angeles, CA, USA aut Knee Surgery, Sports Traumatology, Arthroscopy Springer Berlin Heidelberg 23/2(2015-02-01), 363-369 0942-2056 23:2<363 2015 23 167 https://doi.org/10.1007/s00167-013-2542-8 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/s00167-013-2542-8 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Michener Lori COOR Laboratory, Department of Physical Therapy, Virginia Commonwealth University, Rm 100, West Hospital Basement, 23298, Richmond, VA, USA aut NATIONALLICENCE 700 1- Subasi Yesilyaprak Sevgi School of Physical Therapy and Rehabilitation, Dokuz Eylül University, Izmir, Turkey aut NATIONALLICENCE 700 1- Seitz Amee Physical Therapy Department, Bouve College of Health Science, Northeastern University, 02127, Boston, MA, USA aut NATIONALLICENCE 700 1- Timmons Mark COOR Laboratory, Department of Physical Therapy, Virginia Commonwealth University, Rm 100, West Hospital Basement, 23298, Richmond, VA, USA aut NATIONALLICENCE 700 1- Walsworth Matthew Department of Radiology, University of California Los Angeles, 757 Westwood Boulevard, 90095, Los Angeles, CA, USA aut NATIONALLICENCE 773 0- Knee Surgery, Sports Traumatology, Arthroscopy Springer Berlin Heidelberg 23/2(2015-02-01), 363-369 0942-2056 23:2<363 2015 23 167