Biomaterial Database

Slipped capital femoral epiphysis: factors affecting shear forces on the epiphyseal plate. 1984

H M Litchman, and J Duffy

Very little is known regarding the magnitude of physiological shear forces in the normal capital femoral epiphyseal plate. Changes in these forces related to deformities in the proximal femur have been postulated to increase significantly the shear forces and predispose to slipped epiphysis. By force analysis techniques, a three-dimensional model has been developed to study the change in shear forces that might be expected from abnormal angulation in the frontal and sagittal planes. This study suggests that within the range of normal activity, shear forces on the epiphyseal plate are well below the critical values required to cause a slip. Angular deformities of up to 30 degrees in either the frontal or sagittal planes, by themselves, are unlikely to raise these forces to a critical value.

UI	MeSH Term	Description	Entries
D008954	Models, Biological	Theoretical representations that simulate the behavior or activity of biological processes or diseases. For disease models in living animals, DISEASE MODELS, ANIMAL is available. Biological models include the use of mathematical equations, computers, and other electronic equipment.	Biological Model,Biological Models,Model, Biological,Models, Biologic,Biologic Model,Biologic Models,Model, Biologic
D001835	Body Weight	The mass or quantity of heaviness of an individual. It is expressed by units of pounds or kilograms.	Body Weights,Weight, Body,Weights, Body
D004839	Epiphyses, Slipped	A complete or partial separation of the EPIPHYSES from the DIAPHYSES.	Epiphysiolysis,Epiphysiolyses,Slipped Epiphyses
D005270	Femur Head	The hemispheric articular surface at the upper extremity of the thigh bone. (Stedman, 26th ed)	Femoral Head,Femoral Heads,Femur Heads,Head, Femoral,Head, Femur
D006801	Humans	Members of the species Homo sapiens.	Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D013314	Stress, Mechanical	A purely physical condition which exists within any material because of strain or deformation by external forces or by non-uniform thermal expansion; expressed quantitatively in units of force per unit area.	Mechanical Stress,Mechanical Stresses,Stresses, Mechanical