Examination of the Shoulder Joint Using True Anterior-posterior Photography, Employing a Body Surface Index

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  • Morita Shunsuke
    Department of Radiology, Showa University Fujigaoka Rehabilitation Hospital
  • Fujisawa Hironobu
    Department of Radiology, Showa University Fujigaoka Hospital
  • Kato Kyoichi
    Department of Radiology, Showa University Fujigaoka Hospital Showa University Graduate School of Nursing and Rehabilitation Sciences
  • Nishinaka Naoya
    Department of Orthopaedics, Showa University Fujigaoka Hospital
  • Tsutsui Hiroaki
    Department of Orthopaedics, Showa University Fujigaoka Hospital Department of Orthopaedics, Showa University Fujigaoka Rehabilitation Hospital
  • Nakazawa Yasuo
    Showa University Graduate School of Nursing and Rehabilitation Sciences Department of Radiology, Showa University

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Other Title
  • 体表指標を用いた肩関節True Anterior-Posterior 撮影の検討
  • タイヒョウ シヒョウ オ モチイタ カタカンセツ True Anterior-Posterior サツエイ ノ ケントウ

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Description

Radiographic examination of the anterior part of the shoulder includes routine anterior-posterior imaging that enables easy visualization of traumatic injuries and true anterior-posterior imaging that enables the visualization of intra-articular injuries. The X-ray incident angle of true anterior-posterior imaging is affected by physique and posture. However, in many reports, the angle is uniformly determined on the basis of the antero-posterior axis and the horizontal plane. We previously reported that the glenohumeral joint can be visualized with good reproducibility by establishing a reference line on the basis of three points on the body as indicators, namely the posterior view of the under-surface of the acromion, the coracoid process, and the inferior angle of the scapula. However, visualizing the undersurface of the acromion using physical indicators to set the angle for imaging remains problematic. In previous reports, the angle was consistently set at 20° to the horizontal plane, regardless of physique or posture, which resulted in poor reproducibility. After examining the imaging techniques described in previous reports, we describe here an imaging technique using a reference line based on indicators on the surface of the scapula that enables the glenohumeral joint and the undersurface of the acromion to be visualized with good reproducibility.

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