caa a22 4500 605460140 CHVBK 20210128100237.0 cr unu---uuuuu 210128e20150201xx s 000 0 eng 10.1007/s00167-013-2381-7 doi (NATIONALLICENCE)springer-10.1007/s00167-013-2381-7 Effect of posterior shoulder tightness on internal impingement in a cadaveric model of throwing [Elektronische Daten] [Teruhisa Mihata, Jeffrey Gates, Michelle McGarry, Masashi Neo, Thay Lee] Purpose: Posterior shoulder tightness is common in throwing athletes, especially those with symptomatic shoulder internal impingement. The role of posteroinferior capsular contracture in the pathoetiologies of throwing-related injuries caused by shoulder internal impingement remains unclear. The purpose of this study was to assess effect of posterior shoulder tightness on internal impingement in a cadaveric model of throwing. Methods: Seven fresh-frozen cadaveric shoulders were tested with the shoulder abducted to 90° and at maximum external rotation to simulate the late cocking phase of throwing motion. Glenohumeral joint contact pressure and area through internal impingement, humeral head shift, and the maximum humeral rotation angle were measured. Posteroinferior capsular plication was performed to simulate posteroinferior capsular tightness and induce glenohumeral internal rotation deficit. Results: Following generation of simulated posteroinferior capsular tightness with resultant glenohumeral internal rotation deficit, glenohumeral contact pressure was significantly increased (P<0.05), the impinged area of rotator cuff tendon was significantly decreased (P<0.05), and the humeral head shifted posteriorly (P<0.05) during shoulder internal impingement. Conclusion: Excessive posteroinferior capsular tightness can cause forceful internal impingement of the shoulder at maximum external rotation position. Springer-Verlag Berlin Heidelberg, 2013 Posterior tightness nationallicence Rotator cuff nationallicence Internal impingement nationallicence Throwing nationallicence Shoulder nationallicence Mihata Teruhisa Department of Orthopedic Surgery, Osaka Medical College, 2-7 Daigaku-machi, 569-8686, Takatsuki, Osaka, Japan aut Gates Jeffrey Orthopaedic Biomechanics Laboratory, Long Beach VA Healthcare System, Long Beach, CA, USA aut McGarry Michelle Orthopaedic Biomechanics Laboratory, Long Beach VA Healthcare System, Long Beach, CA, USA aut Neo Masashi Department of Orthopedic Surgery, Osaka Medical College, 2-7 Daigaku-machi, 569-8686, Takatsuki, Osaka, Japan aut Lee Thay Orthopaedic Biomechanics Laboratory, Long Beach VA Healthcare System, Long Beach, CA, USA aut Knee Surgery, Sports Traumatology, Arthroscopy Springer Berlin Heidelberg 23/2(2015-02-01), 548-554 0942-2056 23:2<548 2015 23 167 https://doi.org/10.1007/s00167-013-2381-7 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/s00167-013-2381-7 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Mihata Teruhisa Department of Orthopedic Surgery, Osaka Medical College, 2-7 Daigaku-machi, 569-8686, Takatsuki, Osaka, Japan aut NATIONALLICENCE 700 1- Gates Jeffrey Orthopaedic Biomechanics Laboratory, Long Beach VA Healthcare System, Long Beach, CA, USA aut NATIONALLICENCE 700 1- McGarry Michelle Orthopaedic Biomechanics Laboratory, Long Beach VA Healthcare System, Long Beach, CA, USA aut NATIONALLICENCE 700 1- Neo Masashi Department of Orthopedic Surgery, Osaka Medical College, 2-7 Daigaku-machi, 569-8686, Takatsuki, Osaka, Japan aut NATIONALLICENCE 700 1- Lee Thay Orthopaedic Biomechanics Laboratory, Long Beach VA Healthcare System, Long Beach, CA, USA aut NATIONALLICENCE 773 0- Knee Surgery, Sports Traumatology, Arthroscopy Springer Berlin Heidelberg 23/2(2015-02-01), 548-554 0942-2056 23:2<548 2015 23 167