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The upper limb consists of the arm, forearm, wrist, and hand bones. The humerus is the single bone of the upper arm region. Proximally, it has a large, spherical, smooth head that articulates with the glenoid cavity of the scapula to form the glenohumeral or shoulder joint. The margin of the head is the anatomical neck, a residual epiphyseal plate. Laterally it extends to form bony projections called the greater tubercle and the lesser tubercle. Next to the tubercles is the surgical neck, a...
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Measuring 3D In-vivo Shoulder Kinematics using Biplanar Videoradiography
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Glenoid-based reference system to differentiate shoulder pathologies on plain radiographs.

Austin F Smith1, Christian M Schmidt2, Ameer Tabbaa3

  • 1Florida Orthopaedic Institute, Shoulder & Elbow Department, Tampa, FL, USA; OrthoArizona, Phoenix, AZ, USA.

Journal of Shoulder and Elbow Surgery
|September 30, 2023
PubMed
Summary
This summary is machine-generated.

This study introduces a new method using shoulder radiographs to measure the geometric relationship between the humeral head and glenoid. This technique accurately distinguishes normal shoulders from those with osteoarthritis or cuff tear arthropathy.

Keywords:
Best-fit circleGrashey view radiographglenohumeralglenoidhumeral headshoulder

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Area of Science:

  • Orthopedic surgery
  • Radiology
  • Biomechanical analysis

Background:

  • Shoulder radiographs are crucial for diagnosing pathologies and planning treatments.
  • Current methods lack quantitative analysis of the humeral head-glenoid relationship.
  • A geometric relationship hypothesis was proposed for defining normal and pathological shoulders.

Purpose of the Study:

  • To develop and validate a novel geometric measurement technique for shoulder radiographs.
  • To quantify the relationship between the humeral head and glenoid using best-fit circles.
  • To differentiate between normal, osteoarthritis, and cuff tear arthropathy shoulders based on these measurements.

Main Methods:

  • 156 shoulders analyzed: 53 normal, 51 glenohumeral osteoarthritis (GHOA), 52 cuff tear arthropathy (CTA).
  • Defined humeral head best-fit circle (cHH) and glenoid best-fit circle (cG) using specific geometric rules.
  • Measured horizontal displacement angle (HDA) and vertical displacement angle (VDA) to define the humeral head's position relative to the glenoid.

Main Results:

  • Significant differences in mean HDA and VDA were observed across normal, GHOA, and CTA groups (P < .001).
  • HDA: Normal 61.0°, GHOA 79.9°, CTA 63.4°.
  • VDA: Normal 43.1°, GHOA 40.9°, CTA 59.7°.
  • Excellent interobserver (0.991) and intraobserver (0.998) reliability confirmed the method's consistency.

Conclusions:

  • A distinct geometric relationship exists between the humeral head and glenoid circle.
  • HDA and VDA effectively differentiate normal shoulders from those with GHOA or CTA.
  • This novel methodology shows promise as an accessible preoperative planning tool for shoulder pathologies.