Morphological and mechanical analysis of the glenoid by 3D geometric reconstruction using computed tomography.
OBJECTIVE
To provide a morphological and mechanical analysis of the glenoid by 3D geometric reconstruction using computed tomography.


METHODS
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.


CONCLUSIONS
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.
Couteau
B
B
INSERM U518 - Laboratoire de Biomécanique, Hôpital Purpan BP 3103, 31026 Cedex 3, Toulouse, France. beatrice.couteau@purpan.inserm.fr
Mansat
P
P
Darmana
R
R
Mansat
M
M
Egan
J
J
D001172:Arthritis, Rheumatoid / Q000000981:diagnostic imaging* / Q000473:pathology* / Q000503:physiopathology; D001696:Biomechanical Phenomena; D006801:Humans; D010003:Osteoarthritis / Q000000981:diagnostic imaging* / Q000473:pathology* / Q000503:physiopathology; D012785:Shoulder Joint / Q000000981:diagnostic imaging* / Q000473:pathology* / Q000503:physiopathology; D014057:Tomography, X-Ray Computed