Biomaterial Database

[A contribution to the biostatic analysis of the hip joint III (author's transl)]. 1980

H Legal, and M Reinecke, and H Ruder

Following description of a model which can be applied in clinical practice for planning an operation with regard to the load and strain placed on the hip joint, as expounded in previous articles, the present article explains two more realistic possibilities of calculation of the pressure on the joint. We now have, therefore, three pressure models which can be compared with each other: 1. Assumption of equal distribution of the pressure over the hip joint with calculation of the maximal pressure. 2. Assumption of a linear drop in pressure from the acetabulum in the direction of the floor of the acetabulum. 3. Assumption that the articular cartilage displays an ideally elastic behaviour (calculation of pressure according to Hooke's Law). The last-named model No. 3 is probably the most realistic one, but in view of the fact that it requires complicated calculations, it will be employed in specific cases only, which will usually be mostly of a theoretical nature; Model No. 1 requires a reasonable amount of calculation and will suffice, as shown in the present article, for daily routine surgical planning.

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
D002358	Cartilage, Articular	A protective layer of firm, flexible cartilage over the articulating ends of bones. It provides a smooth surface for joint movement, protecting the ends of long bones from wear at points of contact.	Articular Cartilage,Articular Cartilages,Cartilages, Articular
D006617	Hip Dislocation	Displacement of the femur bone from its normal position at the HIP JOINT.	Hip Displacement,Hip Dysplasia,Dislocation, Hip,Dislocations, Hip,Displacement, Hip,Displacements, Hip,Dysplasia, Hip,Dysplasias, Hip,Hip Dislocations,Hip Displacements,Hip Dysplasias
D006621	Hip Joint	The joint that is formed by the articulation of the head of FEMUR and the ACETABULUM of the PELVIS.	Acetabulofemoral Joint,Acetabulofemoral Joints,Hip Joints,Joint, Acetabulofemoral,Joint, Hip,Joints, Acetabulofemoral,Joints, Hip
D006801	Humans	Members of the species Homo sapiens.	Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D001696	Biomechanical Phenomena	The properties, processes, and behavior of biological systems under the action of mechanical forces.	Biomechanics,Kinematics,Biomechanic Phenomena,Mechanobiological Phenomena,Biomechanic,Biomechanic Phenomenas,Phenomena, Biomechanic,Phenomena, Biomechanical,Phenomena, Mechanobiological,Phenomenas, Biomechanic
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
D013718	Tensile Strength	The maximum stress a material subjected to a stretching load can withstand without tearing. (McGraw-Hill Dictionary of Scientific and Technical Terms, 5th ed, p2001)	Strength, Tensile,Strengths, Tensile,Tensile Strengths