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Biomedical subjects

A J Verbout

Publications and source records attributed to A J Verbout.

At least 19 recordsLinked to original sources
PubMed1991

Magnetic resonance imaging in acetabular residual dysplasia.

Eighteen hips in 15 children showed persistent roentgenographic evidence of congenital acetabular residual dysplasia at four- to eight-year follow-up evaluations. The mean follow-up period was 5.8 years. These hips were subsequently evaluated by magnetic resonance (MR) imaging. MR imaging studies revealed thick unossified chondroepiphyseal cartilage of the acetabular roof adjoining the ilium in all hips. The cartilage in these hips counterbalanced the steep acetabular slope seen on roentgenograms. Initially these hips were regarded as candidates for an acetabular reconstruction, but 11 hips displayed sufficient cartilaginous acetabular coverage on MR images. MR imaging promotes more accurate selection of patients for acetabular reconstruction and aids in the choice of the most appropriate type of acetabular reconstruction.

Acetabulum↗
PubMed1991

Treatment of severe kyphosis in myelomeningocele by segmental spinal instrumentation with Luque rods.

Myelomeningocele leads to kyphosis of the dysplastic spine in 12-20% of cases, resulting in a severe gibbus. In three patients (at the age of 9, 13 and 16 years) with a thoracolumbar kyphosis (90 degrees, 120 degrees and 95 degrees respectively), and a compensatory thoracic lordosis (35 degrees, 105 degrees and 90 degrees) a resection or a wedge osteotomy of the gibbus was performed with segmental sublaminar wire fixation to Luque rods. In addition, a spondylodesis with autogenous bone and an allograft was performed. Correction of the kyphosis (to 30 degrees, 60 degrees and 50 degrees) and lordosis (to 15 degrees, 65 degrees and 55 degrees) was attained. This posterior procedure was sufficient for correction; there was no need for an anterior release. Cord and dura were left intact. During follow-up (27, 60 and 30 months) no progression of the curves has been noted. This one-stage posterior correction with L-rod fixation proved to be a method of choice for this difficult-to-treat spinal deformity.

Adolescent↗
PubMed1990

A correlative study of MR images and cryo-sections of the neonatal hip.

The complex anatomy of the neonatal hip is often difficult to image. Recently, magnetic resonance imaging (MRI) has been used to evaluate the normal and abnormal neonatal hip. We correlated the MRI scans of the hip of a newborn cadaver with multiplanar cryo-sections stained according to Mallory-Cason, to detail the anatomic structures of the normal hip joint space. In our experience, MRI was shown to provide excellent depiction of hip anatomy.

Hip Joint↗
PubMed1989

A model of the human knee, derived from kinematic principles and its relevance for endoprosthesis design.

A mainly deductive kinematic model of the human knee is described. The modelling procedure is based upon the application of a four-bar mechanism. Emphasis has been laid upon elucidating the functional anatomical relationship between several morphological characteristics concerning the shape of the articular surfaces and the constellation of the cruciate ligaments. Starting from a simple planar model, which simulates motions in a sagittal plane only, a spatial model was developed, which allowed an additional longitudinal rotation of the tibia also. The conclusions drawn from this modelling procedure have been used to evaluate from an functional anatomical point of view the current designs of presently available endoprostheses for the knee.

Humans↗
PubMed1988

Free vascularized fibular graft for tibial pseudarthrosis in neurofibromatosis.

Four patients with neurofibromatosis and a dysplastic type of congenital pseudarthrosis of the tibia were treated by resection of the lesion and reconstruction of the extremity with a free vascularized fibular graft. Solid union of the graft was achieved within 3 months in 3 children. However, valgus malalignment of the tibia progressed in all 3. One child was treated with resection of a lateral fibrotic band and another with distal tibial epiphysial distraction and realignment. In the fourth patient, who was skeletally mature, a nonunion developed proximally.

Adolescent↗
PubMed1988

[Congenital defects of tibia and fibula].

This study comprised 7 patients with longitudinal anomalies of the knee and leg classified in accordance with the 'classification of congenital limb deficiencies' introduced by Frantz and O'Rahilly. The anomalies were paraxial hemimelia of the fibula (4 instances), paraxial hemimelia of the tibia (6 instances). In the absence of the proximal tibia, therapy consisted of knee reconstruction according to Brown. In the absence of the distal part of the tibia a proximal tibiofibular synostosis was performed. In one instance corrective osteotomy of the tibia was required in the absence of the fibula. Exarticulation according to Syme was resorted in order to cope with an incorrigible abnormal position of the foot and for leg length inequality. The therapy should aim at giving the child walking ability at a normal time. Exarticulation has to be preferred to amputation in the treatment of these patients.

Child, Preschool↗
PubMed1988

[Bacterial infantile coxitis and its sequelae].

Septic arthritis constitutes a serious threat for the infant hip. Literature data mention a favourable outcome only after surgical drainage within 3-4 days after the onset of symptoms. Clinical observations impose the idea that recognition of this disease often occurs too late, which brings about a subsequent serious damage to the hips involved. In order to verify this idea and to demonstrate the grave sequela of late recognition an investigation was carried out among 18 patients known as having suffered from this disease, collected from 2 children's hospitals and one university clinic. Thereby literature data were confirmed. The variety of hip joint damage is described.

Anti-Bacterial Agents↗
PubMed1987

Surgery for hip dislocation in cerebral palsy.

In 10 children seriously disabled by cerebral palsy, 12 dislocated hips were surgically reduced. The main indications for surgery were impaired perineal care, decreasing sitting balance, and pain. Furthermore, the operations were considered in order to anticipate major problems in the future, such as the wind-swept hip phenomenon and pain in the hip. At follow-up, it appeared that all the children had profited from the surgical procedures.

Cerebral Palsy↗
PubMed1986

Normal shoulder: MR imaging.

Relatively poor spatial resolution has been obtained in magnetic resonance (MR) imaging of the shoulder because the shoulder can only be placed in the periphery of the magnetic field. The authors have devised an anatomically shaped surface coil that enables MR to demonstrate normal shoulder anatomy in different planes with high spatial resolution. In the axial plane, anatomy analogous to that seen on computed tomographic (CT) scans can be demonstrated. Variations in scapular position (produced by patient positioning) may make reproducibility of sagittal and coronal plane images difficult by changing the relationship of the plane to the shoulder anatomy. Oblique planes, for which the angle is chosen from the axial image, have the advantage of easy reproducibility. Obliquely oriented structures and relationships are best seen in oblique plane images and can be evaluated in detail.

Humans↗
PubMed1976

A critical review of the 'neugliederung' concept in relation to the development of the vertebral column.

The literature on the early embryonic development of the vertebral column in various animal species was analyzed to evaluate so many unrelated or contradictory observations. The recurring problems are described. One of the first was the lack of correspondence between the metameric boundaries of the 'primitive vertebral bodies' arising from the somites and those of the adult vertebral bodies, as presumably shown by their relationship to the vertebral processes and spinal nerves. A century ago, Remak introduced the concept of 'Neugliederung', according to which the ultimate vertebral body boundaries are determined by a shift of a half segment in comparison with the earlier segment boundaries. Another question was about the nature of the structures the primitive segments give rise to (axial skeletal tissue and/or muscular tissue and/or nervous tissue), which led to the fundamental problem which system (skeleton or musculature) retains its segmentation. The observation of what was called the intervertebral fissure led to a far-reaching modification of the 'Neugliederung' concept, making a regrouping of parts of the primitive vertebral bodies both possible and probable. The functional necessity for the alternation of muscle and skeleton primordia was also assumed. Although the difference in rostro-caudal level between the boundaries of the somites and the definitive vertebral bodies, measured for instance in relation to the position of the intersegmental vessels, does not support a resegmentation of the vertebral column, because the somite is not a precursor of the adult vertebra, few authors have rejected this view. Subsequently, the discussion focussed on the problem of a) the animal species in which and b) the time at which the intervertebral fissure occurs, and the relationship of this fissure to the primitive vertebral cavity. Under the influence of comparative embryology, a number of authors concentrated mainly on identifying certain embryonic primordia as homologues of phylogenetic vertebral elements, and also on attempting to determine the recombination by which such elements could form a definitive vertebra. According to these authors, not only the vertebral bodies but also the arches and ribs undergo a 'Neugliederung'. Another variant of the 'Neugliederung' concept envisages a gradual shift of the original boundaries of the somites with respect to the transverse level of the definitive vertebrae with or without migration of cellular material. A critical consideration of the concepts at issue, and notably of the 'Neugliederung' concept, is presented. Certain phenomena held to be pillars of the 'Neugliederung' theory could not be confirmed. The functional interpretation of the resegmentation was also reduced to its proper proportions by the analysis. A development of the axial skeleton without resegmentation is just as conceivable in functional terms as one in which resegmentation occurs. A functionally meaningful relationship between muscles and skeletal elements is possible in both cases...

Animals↗