| Abstrakt: |
Diagnosis and treatment of carpal instability require a thorough understanding of the structures involved in the complex carpal motion. After more than a century since the earlier studies on this subject, no unambiguous theory or model can fully explain carpal kinematics. Over the years several authors proposed theoretical models in the attempt to describe the complexity of wrist and carpal motion. The row theory, the column theory, a combination of both and, more recently, the oval ring theory tried to simplify this difficult subject. The study of carpal kinematics has gained renewed interest largely because of the development of newer techniques that have been able to study carpal bone position in vivo without the restrictions related to radio-opaque markers or other bone-tracking devices. Thanks to these three-dimensional analysis techniques the idea of complex multiplanar movement of the carpal bones led to the development of the dart’s thrower motion concept. This motion is thought to be used in many daily-living activities and involves an obliquely oriented plane of wrist motion ranging from combined radial deviation and extension to combined ulnar deviation and flexion. The ongoing studies on several aspects of normal and pathologic carpal motion probably will lead in the near future to a better understanding of this complex subject that will necessarily influence the treatment and rehabilitation of carpal instability. [ABSTRACT FROM AUTHOR] |
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