PubMed Health⌕ Search
Home/Archive/PubMed

PubMed · 537349

Constraints and fixation for implanted joint replacements.

S A Swanson
View original source ↗Export metadata ↓

Abstract

Observations made on both cemented and uncemented joint prostheses after about two years of use show a layer of fibrous tissue next to the bone. The fibrous layer smooths over surface features up to 1mm in size, and must be assumed to be weak in tension and shear. Prosthesis-bone interfaces should therefore be designed to transmit all forces acting on the prosthesis as compressive stresses. The forces acting across prostheses are controlled by the constraints exerted by the articulating surfaces; if the useful ligaments present are allowed to do their job of transmitting tension, the articulating surfaces can be designed to transmit only such forces and moments as can safely be transmitted across the prosthesis-bone interfaces.

Explore related subjects

Bone and BonesConnective TissueHumansJoint ProsthesisJointsProsthesis DesignStress, MechanicalSurface PropertiesWound HealingJournal Article

Keep this discovery

Explore connections, maps & timelines

BibTeXRIS

S A Swanson. 1979. Constraints and fixation for implanted joint replacements.. https://doi.org/10.1016/0141-5425(79)90160-2

Cite the original work for its findings. Save a collection to share your selection of sources.

KEEP EXPLORING

Related citations

PubMed1992

[Rickets due to vitamin D deficiency--a reminder].

Vitamin D deficiency, because of prophylactic supplementation, has become a rare disorder in Switzerland and therefore is usually not considered in the clinical routine. In the few cases we could diagnose, the affected children either have been of East-Mediterranean origin with insufficient nutrition and vitamin supplementation, or were raised in families who, for philosophical or other reasons, refuse any "non-biological" measure including vitamin supplementation. For the orthopedic surgeon the challenging task is to screen out of the many children presented with physiologic gait "disturbance", bow-legs or flat feet the few children with true disorders. An important point is the history of vitamin D prophylaxis; in selected cases X-ray and laboratory findings are indicated. Finally the response to the treatment with vitamin D will confirm the diagnosis of rickets due to vitamin D deficiency.

Bone and Bones↗
PubMed1992

Spondylometaphyseal dysplasia, Sedaghatian type.

In 1980 Sedaghatian described an Iranian infant who died shortly after birth. At autopsy, he was found to have subacute myocarditis, cortical necrosis of kidneys, and adrenal and pulmonary hemorrhage. His skeletal abnormalities included mild rhizomelic shortness of his limbs and platyspondylyl and "laciness" of the iliac wings. In 1987 Optiz et al. described another Iranian infant with a similar perinatal course and roentgenograms. This infant was born to first cousins, suggesting an autosomal recessive single gene defect. We report our findings of another infant with a lethal course.

Bone and Bones↗