Clinics in Shoulder and Elbow

Korean Shoulder and Elbow Society (대한견·주관절의학회)
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Another Glenoid Measurements for Shoulder Surgery

  • Jeong, Yeon-Seok (Department of Orthopaedic Surgery, Sanggye Paik Hospital, Inje University School of Medicine) ;
  • Yum, Jae-Kwang (Department of Orthopaedic Surgery, Sanggye Paik Hospital, Inje University School of Medicine) ;
  • Lee, Jun-Seok (Department of Orthopaedic Surgery, Sanggye Paik Hospital, Inje University School of Medicine)
  • Received : 2018.06.01
  • Accepted : 2018.07.30
  • Published : 2018.12.01
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Abstract

Background: We analyzed the angle between the glenoid anterior surface and glenoid axis, the range of the glenoid apex and the location of the glenoid apex for assistance during shoulder surgery. Methods: Sixty-two patients underwent a computed tomography of the shoulder with a proximal humerus fracture. In the range of the glenoid apex, the ratios of the distribution of triangles with a Constant anterior and posterior area of the glenoid were measured. The location of glenoid apex was confirmed as the percentage of the position with respect to the upper part of the glenoid with the center of the part, analyzed the angle between the glenoid anterior surface and glenoid axis was measured. Results: The angle between the glenoid anterior surface and glenoid axis was $19.80^{\circ}{\pm}3.88^{\circ}$. The location of the glenoid apex is $60.36%{\pm}9.31%$, with the upper end of the glenoid as the reference. The range of the glenoid apex was $21.16%{\pm}4.98%$. When the height of the glenoid becomes smaller, the range of the glenoid apex tends to become larger (p=0.001) and the range of the glenoid apex becomes wider (p=0.001) as the glenoid width narrows. Conclusions: We believe the anatomical measurements of the glenoid will be helpful for a more accurate insertion in glenoid component. It is thought that more accurate insertion is possible if we can set other anatomical measurements using computed tomography imaging of the glenoid which can develop into the study of other anatomical measurements.

Keywords

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Fig. 3. Three-dimensional cursor tool for the apex of glenoid (arrows). First, in panel A, click on the apex of glenoid in axial plane. Panel B, C are the same level cut in coronal and sagittal plane.

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Fig. 4. Glenoid anterior surface angle. The angle between the glenoid axis and the glenoid anterior surface line, at which the anterior area and the posterior area are similar, was measured.

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Fig. 1. Measurement of glenoid. A: glenoid height, B: glenoid width, C: glenoid apex range, D: glenoid anterior surface angle.

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Fig. 2. The point of where anterior area and posterior area, along the glenoid axis, are similar on the axial plane (asterisks).

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Fig. 5. (A) The anterior surface line (dotted line) of glenoid body and glenoid neck is not linear. (B) The point of where the anterior area and the posterior area along the glenoid axis are similar (asterisk). (C) The posterior surface line (dotted line) of glenoid body and glenoid neck is not linear. The anterior area and the posterior area along the glenoid axis are similar. The point where the anterior surface line and the posterior surface line meet was measured in this study. (D) The location from the glenoid upper margin to the point where the anterior surface line and the posterior surface line meet was divided by the total length of the glenoid height to calculate the percent ratio.

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Fig. 6. The location of glenoid apex (L) is 60.36%, the range of glenoid apex (R) is 21.16% (circle).

Table 1. Demographic

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Table 2. Result of Glenoid Measurements (Sex)

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Table 3. Result of Glenoid Measurements (Age)

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Table 4. Statistical Analysis of Glenoid Apex (Pearson Correlation Coefficient)

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