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Precoordinated expression representing fracture of tibia
| Identifier only | 31978002 |
With display term | 31978002 |fracture of tibia | | |
Graphic view of the defining relationships of the concept |fracture of tibia| |
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The second example shown below illustrates the fact that some SNOMED CT concepts provide quite a lot of detailed refinement, some of which might otherwise be captured separately. We will return to this example when considering postcoordination.
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Postcoordinated expressions may be created at run-time by selection of individual facets of a concept. For example, to indicate the nature and location of a fracture for a particular bone and, where relevant, whether the bone affected is on the right or left. Some applications allow generation of postcoordinated expression using natural language processing. Alternatively, postcoordinated expression can be selected during user interface design and bound to simple data entry options. In these cases, the user may not be aware that the information is being captured in a postcoordinated form.
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Representing Postcoordination
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Example: Postcoordination and concept model rules
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In some cases, postcoordination may be simply a matter of choosing one of the subtypes of a defining attribute value. For example the definition of |total hip replacement| includes the attribute |direct device| with the value |total hip replacement prosthesis|. The subtypes of this value include different types of prosthesis, some of which are shown in the graphical view of the concept definition below. One of these more specific values can be selected to specify the type of prosthesis actually used.
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