Biomedical subjects
Publications and source records attributed to R G Dussault.
Impaction fractures of the femoral head following anterior hip dislocation were noted in eight of 11 patients. This fracture is characterized by a depression or a flattening of the posterosuperior and lateral portion of the femoral head. It is usually seen on the standard anteroposterior view of the pelvis.
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Notable advances have been made in the investigation of pancreatic disorders. However, many of the diagnostic tests required are still of an invasive nature and are attended by difficulty and risk. The authors have found that the noninvasive method of axial tomography is highly reliable for the evaluation of pancreatic lesions, especially in cases in which a pancreatic mass is present or the duct of Wirsung is dilated. This procedure can also be helpful in the follow-up of patients who have suffered from acute or chronic pancreatitis. The same diagnostic problem is present at operation. To obtain a quick and reliable diagnosis of pancreatic lesions, the authors performed fineneedle aspiration biopsies followed by immediate staining and examination of the specimen. Among 43 patients an accurate diagnosis was obtained in 41 instances and no complication was ascribed to this diagnostic procedure.
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Intervertebral disk calcification and spine fusion were observed in patients with Klippel-Feil syndrome, myositis ossificans progressive, juvenile rheumatoid arthritis, ankylosing spondylitis, and surgical spine fusion. The fusion appears to come first, leading to calcification. This suggests that fusion prevents the normal mechanical stresses within the disk, leading to premature degenerative changes and calcification of the nucleus pulposus.
Unexplained pain following prosthetic replacement of the hip should be evaluated by a review of serial plain radiographs, hip aspiration and arthrography. The distinction between infection and loosening cannot be established on plain films. The preoperative diagnosis of infection and/or loosening should be attempted by hip aspiration and arthrography. Neither of the latter studies is definitive but in combination they correlate well with the surgical findings.
MR imaging of the wrist has the unique capability of simultaneously demonstrating bone and soft tissue structures. Its exquisite sensitivity for detecting bone marrow edema makes it and ideal screening tool for diagnosing radiographically occult osseous injuries and areas of AVN. This, together with its ability to provide a comprehensive, non-invasive assessment of the ligaments, tendons, nerves, and components of the TFC make MRI a very powerful tool for evaluating patients with wrist pain of uncertain etiology. Its exact role in the work-up of these patients has not been entirely established, but with further advances in technology and the radiologist's understanding of wrist anatomy and pathology, MRI is assuming a more central role in this clinical setting.
Appositional incremental acetabuloplasty using a self growing iliac crest graft pedicle on its epipyseal vessels was performed in 54 puppies 3 months old. Remodeling an adaptation to the shape of the acetabulum is excellent in most of the cases, issuing into a spherical composite cavity. Persistance of a hyaline cartilage is noted until the end of the first years, but long term morphological transmission electronmicroscopy studies demonstrate a progressive transformation into fibrocartilage. This experimental study demonstrates the possibility to use remodeling and growth properties of a pedicled iliac crest, transplanted as an iland flap on the extraarticular acetabular roof. This new surgical technique can be proposed for the care of difficult dysplastic hips in children.
This report describes a rare variant represented by the association of locked facets at C2-3 with a fracture of the neural arch of the axis. Fracture of the neural arch of the axis is a broad term including the Hangman fracture, traumatic spondylolisthesis of the axis, fractures of the arch of the axis, or the more recently described fractures of the ring of the axis.
Magnetic resonance imaging (MRI) of the knee is the most frequently performed musculoskeletal MRI examination and, after initial study with plain radiographs, has supplanted arthrography and arthroscopy as the imaging procedure of choice in the investigation of internal derangement and arthritic disorders of the knee. Knee MRI is a highly accurate, noninvasive procedure that provides exquisite depiction of the soft tissues and bone marrow. In this article a simplified approach to knee MRI is presented, including a practical discussion on the basics of MRI physics, review of the normal anatomy, and illustration of the most commonly encountered pathologic conditions.