Dynamische radioulnare konvergenz nach Darrach-operation, weichteilstabilisierungsoperationen der distalen ulna und ulnakopfprothesenimplantation - Eine experimentelle biomechanische studie

Translated title of the contribution: Dynamic radioulnar convergence after Darrach resection, soft tissue stabilization of the distal ulna and ulnar head prosthesis implantation - An experimental biomechanical study

M. Sauerbier, M. E. Hahn, M. Fujita, P. G. Neale, G. Germann, K. N. An, R. A. Berger

Research output: Contribution to journalArticle

10 Scopus citations

Abstract

The most common method of treating the arthrotic distal radioulnarjoint (DRUJ) is resection of the entire ulnar head (Darrach procedure). Complications related to instability of the distal forearm resulting from loss of the ulnar head are usually manifested by pain and weak grip strength and have remained the drawbacks of this procedure. In an attempt to mechanically stabilize the distal forearm, an endoprosthesis was developed to replace the ulnar head after Darrach resection. The purpose of this study was to: 1) evaluate the dynamic effects of the Darrach procedure on radioulnar convergence; and 2) evaluate the mechanical efficacy of two soft tissue stabilizing techniques (Pronator quadratus advancement flap and ECU/FCU tenodesis) for the unstable distal ulnar stump and 3) the stability after the implantation of an ulnar head endoprosthesis following a Darrach resection on radioulnar convergence. With a dynamic PC-controlled forearm simulator the rotation of 7 fresh-frozen cadaver upper extremities was actively and passively performed while loading relevant muscles. Resultant total forearm torque and the 3-dimensional kinematics of the ulna, radius and third metacarpal were recorded simultaneously. The implantation of the ulnar head endoprosthesis effectively restored the stability of the DRUJ. There were significantly better results after the implantation of the prosthesis compared with the Darrach and the soft tissue stabilization procedures. This study provides laboratory validity to the option of implanting an ulnar head endoprosthesis as an attempt to stabilize the distal forearm after Darrach resection in lieu of performing soft tissue stabilization techniques.

Translated title of the contributionDynamic radioulnar convergence after Darrach resection, soft tissue stabilization of the distal ulna and ulnar head prosthesis implantation - An experimental biomechanical study
Original languageGerman
Pages (from-to)688-698
Number of pages11
JournalUnfallchirurg
Volume105
Issue number8
DOIs
StatePublished - Dec 1 2002

Keywords

  • Darrach operation
  • Distal radioulnarjoint
  • Distal ulnar stabilization
  • Radioulnar instability
  • Ulnar head prosthesis

ASJC Scopus subject areas

  • Surgery
  • Emergency Medicine
  • Orthopedics and Sports Medicine

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