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Dislocations

Dislocations are joint injuries that force the ends of your bones out of position. The cause is often a fall or a blow, sometimes from playing a contact sport. When a dislocation occurs, you can't move the joint. You can dislocate your ankles, knees, shoulders, hips and elbows. You can also dislocate your finger and toe joints. Dislocated joints often are swollen, very painful and visibly out of place.

If you dislocate a joint, seek medical attention. Treatment depends on which joint you dislocate and the severity of the injury. It might include manipulations to reposition your bones, medicine, a splint or sling, and rehabilitation. When properly repositioned, a joint will usually function and move normally again in a few weeks. Once you dislocate a shoulder or kneecap, you are more likely to dislocate it again. Wearing protective gear during sports may help prevent dislocations.

Dislocation on Wikipedia

:''For the syntactic operation, see Dislocation (syntax)'' :''For the medical term, see Dislocation (medicine)'' In materials science, a '''dislocation''' is a linear crystallographic defect, or irregularity, within a crystal structure. The presence of dislocations strongly influences many of the properties of real materials. The theory was originally developed by Vito Volterra in 1905. Some types of dislocations can be visualised as being caused by the termination of a plane of atoms in the middle of a crystal. In such a case, the surrounding plane (mathematics) are not straight, but instead bend around the edge of the terminating plane so that the crystal structure is perfectly ordered on either side. The analogy with a stack of paper is apt: if a half a piece of paper is inserted in a stack of paper, the defect in the stack is only noticeable at the edge of the half sheet. There are two major types of dislocations: #Edge dislocations; and #Screw dislocations.

Dislocation geometry

Any dislocation can be described by the Burgers vector and the dislocation line. However, an introduction to these and other terms used to describe dislocations can be difficult and it is easer to begin with a simple description of an edge dislocation.

Edge dislocations

''Edge dislocations'' can be visualised as being formed by adding an extra half-plane of atoms to a perfect crystal, so that a defect is created in the regular crystal structure along the line where the extra half-plane ends (Figure 1). Such visualisations can be difficult to interpret. Initially, it can be helpful to follow the process of simplification involved in arriving at such representations.One approach is to begin by considering a 3-d representation of a perfect crystal lattice, with the atoms represented by spheres (Figure A). The viewer ...   [ Read More ]


External Resources

Unorthodox Reel: Dislocated Structure and the Vagueness of Memories - Analysis of the film's structure.

Dislocated Hipsters, The - History, song list, lyrics, video files, and reviews for the rock, pop, and rockabilly band.

Dislocate - Print and online journal published by graduate students at the University of Minnesota. Current issue, archives, and submission information.

Dislocate Records - New releases, rare, and collectable punk rock, mod, ska, indie and alternative vinyl and CDs. Based in England.

Peter Stefanovic - Computational materials science, nanocrystalline materials, mechanical properties of matter, dislocations theory.

Dislocated Clothing - USA. Provides short-sleeve shirts for men and women and accessories.

Twin Cedars Investments, LLC - Chicago-based hedge fund with a multi-strategy approach that includes both fundamental and directional investing in growth (technology, emerging markets) and value (price dislocation) opportunities in U.S. and global equity and fixed income markets. The Fund has the ability to invest in both long and short opportunities.

Dislocated Fictions - Writer, critic, polemicist and agent provocateur, Gabe Chouinard.

All About Shoulder Dislocation - Shoulder dislocation from a patient's point-of-view. Detailed illustrations accompanying text.

eMedicine Health - Finger Dislocation - Consumer health resource center providing information on the causes, symptoms, and treatment.



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