Buttonhole deformity

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Ring and little fingers show the typical joint position (flexion in the middle and hyperextension in the end joint).
Note: X-ray for rheumatoid arthritis

In medicine, buttonhole deformity is the misalignment of one of the four three-part fingers of a hand when the middle joint cannot be actively stretched, i.e. remains in a flexed position, and the end joint is stretched or overextended at the same time.

The cause of this type of misalignment is a defect in the (finger) extensor system in the area of ​​the middle joint as a result of an accident or in the case of rheumatic diseases .

Therapy consists of repositioning (closed or open surgery, including reconstruction of the extensor apparatus and, if necessary, correction of the end joint) and a subsequent three-week immobilization in the functional position. If left untreated, either stiffening or instability ( dangling joint ) of the central joint occurs .

See also

Individual evidence

  1. ↑ G. Souza-Offtermatt: Intensive Surgery Course . Urban & Fischer-Verlag, 2004, ISBN 3-437-43490-X , p. 565. (online at: books.google.de )
  2. ↑ O. Kloeters include: crash course surgery. Urban & Fischer-Verlag, 2004, ISBN 3-437-43230-3 , p. 299. (online at: books.google.de )
  3. ↑ J. Krämer et al.: Orthopädie. Springer, 2004, ISBN 3-540-21970-6 , p. 113. here (online at: books.google.de )