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Evaluation of three-dimensional glenoid structure using MRI

Published online by Cambridge University Press:  24 August 2001

HIROAKI INUI ,
KAZUOMI SUGAMOTO ,
TAKASHI MIYAMOTO ,
AKITOSHI MACHIDA ,
JUN HASHIMOTO  and
KATSUYA NOBUHARA
HIROAKI INUI
Affiliation:
Department of Orthopaedic Surgery, Osaka University Medical School, Osaka
KAZUOMI SUGAMOTO
Affiliation:
Department of Orthopaedic Surgery, Osaka University Medical School, Osaka
TAKASHI MIYAMOTO
Affiliation:
Department of Orthopaedic Surgery, Osaka University Medical School, Osaka
AKITOSHI MACHIDA
Affiliation:
Nobuhara Hospital and Institute of Biomechanics, Hyogo, Japan
JUN HASHIMOTO
Affiliation:
Nobuhara Hospital and Institute of Biomechanics, Hyogo, Japan
KATSUYA NOBUHARA
Affiliation:
Nobuhara Hospital and Institute of Biomechanics, Hyogo, Japan
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Abstract

The tilting angle and the shape of the glenoid cavity are considered to relate closely to shoulder stability. They are also important when planning arthroplasty and developing new designs. This study examines the glenoid cavity using 3-dimensional MRI. Forty volunteers (20 men, 20 women; average age 21.4; range 18–35 y) were enrolled in the study. The tilting angles of the glenoid bone were measured in 5 consecutive axial planes perpendicular to the glenoidal long axis. Cross sections were divided into 3 types (concave, flat, convex) according to the shape on each plane.

The average tilting angles for the 5 planes from the bottom to the top were 3.3±4.1, 1.4±3.8, −0.6±1.9, −1.4±3.3, and −6.2±3.3 degrees anteriorly, indicating that the 3-dimensional bony structure of the glenoid was twisted anteriorly to posteriorly. Images on the bottom plane consisted of 82.5% concave type, 15% flat type and 2.5% convex type, while only 3 cases (7.5%) showed concave at the top plane. The shape of the glenoid cavity is thought to be conducive to glenohumeral motion and stability.

Keywords

Glenoid cavity3D imagingMR imagingfunction
Type
Paper
Information
The Journal of Anatomy , Volume 199 , Issue 3 , September 2001 , pp. 323 - 328
Copyright
© Anatomical Society of Great Britain and Ireland 2001

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