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Biomedical subjects

M Mansat

Publications and source records attributed to M Mansat.

90 records · Page 5Linked to original sources
PubMedDate not supplied

Anatomic variation of the mechanical properties of the glenoid.

Finite element analysis modeling is an important tool in the design of total joint replacements. However, to use a finite element analysis the material properties of the studied bone must be known. The aim of the study was to measure the elastic properties of the glenoid bone in the axial, coronal, and sagittal planes with an ultrasound transmission technique. The relative density and Houndsfield computed tomography numbers were also assessed. Three pairs of scapulas were obtained from unembalmed human cadavers. Seventy-four cubic cancellous bone specimens of 6 mm were used for ultrasonic measurements. The study showed significant differences with anatomic location. Mechanical properties of cancellous bone were found to be higher near the direction of application of the resultant force, perpendicular to the articular surface of the glenoid. Mechanical properties were found to be significantly higher at the center and posterior edge of the glenoid (p < 0.01). Significant differences were also found in the three planes studied. The lateromedial Young's modulus (E1) was higher than the anteroposterior modulus (E2) and the superoinferior modulus (E3) (E1 = 372 +/- 164 MPa, E2 = 222 +/- 79 MPa, E3 = 198 +/- 75 MPa).

Analysis of Variance↗
PubMedDate not supplied

In vivo characterization of glenoid with use of computed tomography.

Improvement in the treatment of the shoulder could be achieved by accurately describing the pathologic characteristics of the joint. The goal of this study was to characterize, in vivo, glenoids with 3 different diagnoses by using computed tomography (CT): rotator cuff pathology with a limited rupture and without bony changes (group A, n = 15), primary osteoarthritis (group B, n = 13), and rheumatoid arthritis (group C, n = 4). The bone density distribution was assessed by means of the CT value expressed in Hounsfield units. The version angle was also measured. The examination of the CT value showed different distributions according to the pathology. In group A, the cancellous bone presented a central area with a relatively homogeneous and low density. In group B, the reinforcement of the density along with the posterior region seemed to be correlated with the retroversion angle. In the rheumatoid arthritis group, the main characteristic was the loss of the subchondral bone margin. The cartography of the CT value was not reproducible among the 4 cases examined. These in vivo descriptions provide guidelines for the surgeon before total shoulder arthroplasty, helping preoperative planning as well as simulation of implantation.

Adolescent↗
PubMedDate not supplied

CT and MRI of massive osteolysis of Gorham.

Massive osteolysis of Gorham is a clinical, radiographic, and histologic entity characterized by histologically benign vascular proliferation involving bone associated with extensive osteolysis. We present CT and MRI findings of the disease and serial radiography following the progressing bone destruction.

Adult↗
PubMedDate not supplied

[MRI in subacromial pathology. Report of 20 cases].

The authors report the results of MRI performed in 20 patients presenting clinical symptoms of subacromial pathology. The MRI results are correlated to the results of arthrography or arthro CT scan and also to surgical results. MRI is an excellent technique if a precise protocol with T2 weighted images is respected in order to visualize tears or minor perforations of the supraspinatus muscle.

Acromioclavicular Joint↗
PubMedDate not supplied

[The Maffucci syndrome. Apropos of a case].

Maffucci's syndrome is a particularly rare clinical form of dyschondroplasia. It combines angiomatosis, chondromatosis and sometimes dyschromic cutaneous lesions (Kast). It evolves into a neoplastic context in 20 to 50 p. cent of the cases, dominated by the risk of sarcomatous degeneration. The lesions are preferably located on the hands and the feet.

Chondroma↗