It is one of the few complete fracture classification systems to remain in use today after validation. The English language version of the system  allows consistent in detail description of a fracture in defined terminology by creating a 5-element alphanumeric code:. First, each fracture is given to 2 numbers to describe which bone it affects, and where in the bone:. Each fracture is next given a letter A, B or C to describe the joint involvement of the fracture:. Subgroups are then used to describe the fractures in terms of displacement versus apposition, which is the degree to which the parts are in contact with each other , rotation, angulation and shortening.
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The strategic initiative to establish an AO Trauma division—with its full complement of education, research and community development commissions—became a restructuring process in , delivering a consistent structure within the international and regional operations. The membership launch was well received by the 2, existing members from European countries. Community development, education and research officers were nominated, and the regional education and community development committees of were very active throughout Europe continued to account for nearly 45 percent of all AO Trauma course participants globally.
In March , a country council general assembly facilitated by Paul Szypryt GB saw representatives from over 40 European countries agree on a representative voting method. With activities in over 40 countries, different languages and cultures, this remains a challenging task, but finding commonalities remains a strong driving force.
AO Trauma Europe and Southern Africa
Although its existence is widely known among the relevant subspecialty groups, its day-to-day use varies greatly from institution to institution and it is not safe to assume that clinicians reading a report are familiar with it. It is therefore not wise to simply describe an injury as "B2". As such, familiarity with them is worthwhile. The AO spine thoracolumbar classification system consists of only three classes of thoracolumbar injuries. Three separate components to every fracture are considered, with only the first fully assessable on imaging alone 4. Type B injuries involve the anterior or posterior tension band. Type C injuries involve displacement in any direction.
Müller AO Classification of fractures