The effect of scapular position on subacromial contact behavior: a cadaver study

Takayuki Muraki, Nobuyuki Yamamoto, John W. Sperling, Scott P. Steinmann, Robert H. Cofield, Kai Nan An

研究成果: Article同行評審

7 引文 斯高帕斯(Scopus)

摘要

Background Patients with subacromial impingement were reported to show abnormal scapular positions during shoulder elevation. However, the relationship between the scapular positions and subacromial impingement is unclear. The purpose of this study was to biomechanically determine the effect of scapular position on subacromial contact behavior by using fresh frozen cadavers. Methods The peak contact pressure on the coracoacromial arch was measured with a flexible tactile force sensor in 9 fresh frozen cadaver shoulders. The measurement was performed during passive glenohumeral elevation in the scapular plane ranging from 30° to 75°. The scapular downward and internal rotations and anterior tilt were simulated by tilting the scapula in 5° increments up to 20°. The measurement was also performed with combination of scapular downward and internal rotations and anterior tilt positions. Results The peak contact pressure decreased linearly with anterior tilt, and a significant difference between neutral scapular position (1.06 ± 0.89 MPa) and anterior tilt by 20° (0.46 ± 0.18 MPa) was observed (P < .05). However, the scapular positioning in the other directions did not change the peak contact pressure significantly. Furthermore, any combination of abnormal scapular positions did not affect peak contact pressure significantly. Conclusion Scapular anterior tilt decreased peak contact pressure during passive shoulder elevation. In addition, scapular downward and internal rotations had little effect on peak contact pressure. The abnormal scapular motion reported in previous studies might not be directly related to symptoms caused by subacromial impingement.

原文English
頁(從 - 到)861-869
頁數9
期刊Journal of Shoulder and Elbow Surgery
26
發行號5
DOIs
出版狀態Published - 2017 5月 1

All Science Journal Classification (ASJC) codes

  • 手術
  • 骨科和運動醫學

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