181,183 research outputs found
Corwin Labrum
No full textCorwin Tucker Labrum is pictured his school year at Roosevelt Elementary. He is the son of Lloyd and Erma Labrum. He married Virginia R. Gradner. He was born December 15, 1928 and died September 26, 1996
Norman Labrum
No full textNorman Labrum is pictured his sophomore year at Roosevelt High School. He is the son of Lloyd R. and Erma Labrum. He served in the Navy during World War II. He married Arlene Ross in 1945. He was born January 23, 1927 and died October 21, 1970
Vascular supply to the acetabular labrum
No full textThe acetabular labrum plays an important role in hip joint stability and protection of the articular cartilage of the hip. Despite this, few investigators have evaluated its microscopic vasculature and, to our knowledge, none has assessed its macroscopic blood supply. The purposes of this study were to identify the origin and course of the vascular supply to the acetabular labrum to determine if this blood supply is affected by a labral tear
Norman Labrum
No full textNorman Labrum is pictured his freshman year at Roosevelt High School. He is the son of Lloyd R. and Erma Labrum. He served in the Navy during World War II. He married Arlene Ross in 1945. He was born January 23, 1927 and died October 21, 1970
Lloyd Levere Labrum
No full textLoyd Levere Labrum is pictured his school year at Roosevelt High School. He is the son of Lloyd R. and Erma Labrum. He served in the Army during World War II. He married Oleta Salyer in 1945. He was born June 4, 1925 and died December 13, 2002
Lloyd Levere Labrum
No full textLoyd Levere Labrum is pictured his school year at Roosevelt High School. He is the son of Lloyd R. and Erma Labrum. He served in the Army during World War II. He married Oleta Salyer in 1945. He was born June 4, 1925 and died December 13, 2002
The influence of the acetabular labrum on hip joint cartilage consolidation : a poroelastic finite element model
No full textThe goal of this study was to investigate the influence of the acetabular labrum on the consolidation, and hence the solid matrix strains and stresses, of the cartilage layers of the hip joint. A plane-strain finite element model was developed, which represented a coronal slice through the acetabular and femoral cartilage layers and the acetabular labrum. Elements with poroelastic properties were used to account for the biphasic solid/fluid nature of the cartilage and labrum. The response of the joint over an extended period of loading (10,000 s) was examined to simulate the nominal compressive load that the joint is subjected to throughout the day. The model demonstrated that the labrum adds an important resistance in the flow path of the fluid being expressed from the cartilage layers of the joint. Cartilage layer consolidation was up to 40% quicker in the absence of the labrum. Following removal of the labrum from the model, the solid-on-solid contact stresses between the femoral and acetabular cartilage layers were greatly increased (up to 92% higher), which would increase the friction between the joint surfaces. In the absence of the labrum, the centre of contact shifted towards the acetabular rim. Subsurface strains and stresses were much higher without the labrum, which could contribute to fatigue damage of the cartilage layers. Finally, the labrum provided some structural resistance to lateral motion of the femoral head within the acetabulum, enhancing joint stability and preserving joint congruity.
Author Keywords: Hip joint; Labrum; Finite elemen
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
"Closing the R&D Gap, Evaluating the Sources of R&D Spending"
Get PDFBoth spending and tax policies have been implemented in the United States with the goal of stimulating private sector research and development (R&D). Karier questions whether current R&D policy, especially the research and experimentation tax credit, can contribute to closing the gap between nondefense expenditures on R&D in the United States and such expenditures in other countries, such as Japan and Germany. He also explores possible changes to our current R&D policy to make it more effective.
The acetabular labrum seal: a poroelastic finite element model.
No full textObjective. The aim of the study is to investigate the labrum’s ability to seal a pressurised layer of synovial fluid within the joint, and to study the influence of this sealing mechanism on cartilage deformation, interstitial fluid pressure and collagen solid matrix stresses.
Background. Cartilage degeneration has been observed in conjunction with labrum pathology. However, little is known about the function of the labrum. Experimental observations have been reported which are consistent with a sealing function of the labrum.
Methods. The model was an axisymmetric geometric approximation of the acetabular and femoral cartilage layers and the surrounding labrum. A poroelastic formulation was used to account for the solid and fluid components of these hydrated tissues. A sensitivity analysis of the labrum material properties was carried out.
Results. With a compressive load of 1200 N applied across the joint model, the labrum could seal a layer of pressurised fluid between the femur and acetabulum, thus preventing contact of the articulating surfaces. With this sealing effect, loads were transferred across the joint predominantly by uniform pressurisation of the interstitial fluid of the cartilage layers. In the absence of this sealing, strains within the solid matrix of the cartilage layers were higher (e.g. 20% vs. 3%).
Conclusions. The labrum can seal against fluid expression from the joint space. This sealing function protects the cartilage layers of the hip.
Relevance
Current treatments for labrum damage and early arthrosis may compromise the sealing function of the labrum. With continued study of the function and importance of the labrum, new surgical repair strategies can be developed to maintain the overall function of the hip joint
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