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Morphological and mechanical analysis of the glenoid by 3D geometric reconstruction using computed tomography
B Couteau1, P Mansat, R Darmana
1INSERM U518 - Laboratoire de Biomécanique, Hôpital Purpan BP 3103, 31026 Cedex 3, Toulouse, France. beatrice.couteau@purpan.inserm.fr
Objective:
To provide a morphological and mechanical analysis of the glenoid by 3D geometric reconstruction using computed tomography.
Design:
For patients with different pathologies (Group A=control group, Group B=primary osteoarthritis, Group C=rheumatoid arthritis), the variation in shape of the scapula was characterized by measuring the glenoid version (beta).
Methods:
Mapping the computed tomography number and its 3D variation in the bone as a finite element structure.
Results:
In Group A, the mean value of version was 17 degrees (range 12-22 degrees ). In Groups B and C the mean value of version were 27 degrees (range 4-48 degrees ) and 31 degrees (range 25-31 degrees ) of retroversion. At the center of the glenoid there was a homogeneous area of bony tissue with low computed tomography values and the subchondral bone could be clearly identified. For Group B patients, the computed tomography values were increased at the posterior margin of the glenoid, with a thickening of the posterior area acting as a strengthening column. For the Group C patients, the anatomical modifications were not reproducible between two cases examined.
Conclusion:
Results reveal a great difference between a healthy and a pathological glenoid. RelevanceThe method will be the basis for future study of the pathological characteristics of the joint. Results should provide a new pre-operative insight to help guide the surgeon.