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Carpal instability

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Abstract

This review addresses the pathoanatomical basics as well as the clinical and radiological presentation of instability patterns of the wrist. Carpal instability mostly follows an injury; however, other diseases, like CPPD arthropathy, can be associated. Instability occurs either if the carpus is unable to sustain physiologic loads (“dyskinetics”) or suffers from abnormal motion of its bones during movement (“dyskinematics”). In the classification of carpal instability, dissociative subcategories (located within proximal carpal row) are differentiated from non-dissociative subcategories (present between the carpal rows) and combined patterns. It is essential to note that the unstable wrist initially does not cause relevant signs in standard radiograms, therefore being “occult” for the radiologic assessment. This paper emphasizes the high utility of kinematographic studies, contrast-enhanced magnetic resonance imaging (MRI) and MR arthrography for detecting these predynamic and dynamic instability stages. Later in the natural history of carpal instability, static malalignment of the wrist and osteoarthritis will develop, both being associated with significant morbidity and disability. To prevent individual and socio-economic implications, the handsurgeon or orthopedist, as well as the radiologist, is challenged for early and precise diagnosis.

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Acknowledgement

We are grateful to Dr. Claudia Lipke, University of Regensburg, for critical proofreading of the manuscript.

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  1. Herz- und Gefäßklinik GmbH, Institut für Diagnostische und Interventionelle Radiologie, Salzburger Leite 1, 97616, Bad Neustadt an der Saale, Germany

    R. Schmitt, S. Froehner, G. Coblenz & G. Christopoulos

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  1. R. Schmitt
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Correspondence to R. Schmitt.

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Schmitt, R., Froehner, S., Coblenz, G. et al. Carpal instability. Eur Radiol 16, 2161–2178 (2006). https://doi.org/10.1007/s00330-006-0161-1

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