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Biomedical subjects

M A Asher

Publications and source records attributed to M A Asher.

At least 55 records · Page 3Linked to original sources
PubMed1976

Compression fixation of subtrochanteric fractures.

Compression fixation with a blade plate was used in the treatment of 11 fresh and 9 nonunited subtrochanteric fractures. Fifteen fractures united as fixed. Three settled into varus with eventual union in 2 and a fibrous nonunion with metal failure in one. One fracture became infected and the patient died of metastatic fibrosarcoma and one was lost to accurate long-term follow-up. The average Harris Hip Rating for 18 patients was 84, an average of 24 postoperatively. In each instance, technical errors accounted for suboptimal results. Compression fixation is designed for the subtrochanteric region for either fresh or nonunited fractures.

Adolescent↗
PubMed1976

Dislocations of the upper extremity in children.

Traumatic dislocations and subluxations of the upper extremity in children have been surveyed. The elbow joint is most commonly dislocated and is dislocated more frequently in children than in adults. Severe neurovascular injury may be associated with dislocation of this joint. The most common subluxation is that of the radial head, secondary to a "pulled elbow." Otherwise dislocations and subluxations of the upper extremity are uncommon in children, apparently because of the relative weakness of the epiphyseal plate. Most of these injuries are the result of predictable indirect forces. Principles of reduction and immobilization are based on the unique anatomic structure of the joint involved and the known anatomic disruption resulting from the trauma.

Acromioclavicular Joint↗
PubMed1975

Some physical and mechanical factors affecting the simple shear strength of methylmethacrylate.

An investigation of the effect of kneading time on the simple shear strength of cold-cured plain methylmethacrylate bone cement and on the effect of anchor-hole configuration on the load-carrying capabilities of the cement anchor-hole configuration demonstrates that at a strain-rate of 10-3 rad/second, the mean simple shear strength of the cement was 251.65 (plus or minus 3%) for both 30-second and 2-minute kneading times. Increasing the loading rate to 10-1 rad/second increased the simple shear strength of 326.20 kg/cm-2 (plus or minus 2%). The geometric configuration did not significantly affect the maximum shear load-carrying capabilities of the methylmethacrylate.

Acetabulum↗
PubMed1975

Performance analysis of an ex vivo geometric total knee prosthesis.

Studies were made of a well functioning geometric total knee prosthesis, removed at autopsy from a sixty-one-year-old man, which had been used for eight months. The components were firmly embedded in bone with no evidence of loosening. There was significant deformation of the polyethylene tibial component, but no significant wear on the metallic component. Thin layers of fibrous tissue were found in some areas of the bone-cement interfaces.

Acrylates↗
PubMedDate not supplied

Correlation of coagulopathy and pulmonary insufficiency with blood transfusion in spinal fusions.

In a review of 210 spinal fusions, the platelet count and the arterial-alveolar oxygen tension ratio both decreased as the blood transfused increased, but were not correlated with positive fluid balance. In procedures that might require more than 70-80 ml/kg of blood, such as myelodysplastic, paralytic, and congenital spinal surgery, the coagulation system and arterial gases should be monitored frequently intraoperatively and postoperatively.

Adult↗
PubMedDate not supplied

Three-dimensional analysis of right thoracic idiopathic scoliosis.

Three-dimensional spinal analysis was performed on thirty-one female patients with untreated right thoracic idiopathic scoliosis to determine the relationship between the degree of scoliosis and the degree of kyphosis, maximal curvature, and apical vertebral displacement. The degree of scoliosis did not correlate with the degree of thoracic kyphosis. Six patients had thoracic kyphosis over 50 degrees, 19 patients had a kyphosis between 20-50 degrees, and the last six patients had a thoracic kyphosis less than 20 degrees. The apex of the scoliosis was at or below the apex of the thoracic kyphosis in all patients except one. The degree of displacement of the apical vertebrae had a positive correlation (r = 0.732) with the degree of scoliosis. The maximal curvature of the spine was correlated (r = 0.613) with the degree of scoliosis.

Adolescent↗
PubMedDate not supplied

Combined innominate and femoral osteotomy for the treatment of severe Legg-Calvé-Perthes disease.

Nine patients who underwent combined innominate and femoral osteotomy for the treatment of Legg-Calvé-Perthes disease were evaluated. All had Catterall group III or IV involvement, the average number of radiographic "head-at-risk" signs was 3.2, and the average epiphyseal extrusion was 26%. At an average follow-up of 50.5 months, the clinical results were seven good and two fair. The radiographic results were four good, four fair, and one poor. We believe this procedure is indicated in the older patient with severe Perthes disease in whom femoral head subluxation or deformity makes containment difficult or impossible by more conventional methods.

Child↗
PubMedDate not supplied

Effects of splitting the iliac apophysis on subsequent growth of the ilium: a rabbit study.

We wished to determine if splitting the iliac apophysis in a skeletally immature animal would affect subsequent growth of the ilium. Thirty-two rabbits were divided into six groups. One group was the sham group; the other five groups received different types of surgical splitting and repair of the iliac apophysis. The results suggested that any splitting of the iliac apophysis in an immature animal significantly affects subsequent growth of the ilium. The type of repair apparently does not affect the amount of growth retardation. Using electrocautery to split the iliac apophysis has a significantly greater effect on growth of the ilium.

Animals↗