Zusammenfassung
Operationsziel
Stabilisierung von Kahnbeinpseudarthrosen/Trümmerfrakturen mit palmarer winkelstabiler „Low-profile“-Skaphoidplatte.
Indikationen
Kahnbeinpseudarthrose mit großer beugeseitiger Defektzone, Zweit‑/Dritteingriff nach vorheriger Stabilisierung mittels Headless Compression Screw (HCS). Trümmerfrakturen des Kahnbeins, die mit einer HCS nicht ausreichend stabilisiert werden können.
Kontraindikationen
Fortgeschrittene Radio- oder Mediokarpalarthrose, kleine proximale Polfragmente, Mehrfachfragmentierung des proximalen Pols.
Operationstechnik
Über einen beugeseitigen Zugang wird die Kahnbeinpseudarthrose dargestellt. Nach Korrektur der DISI-Fehlstellung („dorsal intercalated segment instability“) des Lunatums sowie der Humpback-Deformität des Kahnbeins wird die Reposition mit temporären Bohrdrähten fixiert. Die Pseudarthrose wird angefrischt und der Knochendefekt mit Spongiosa aufgefüllt. Anschließend erfolgt die Platzierung der Platte und die Fixierung mit winkelstabilen Schrauben über je drei Schrauben im proximalen und distalen Fragment des Kahnbeins. Die Plattenanlage bei Trümmerfrakturen des Kahnbeins erfolgt analog zur Pseudarthrose nach vorheriger Reposition und temporärer Bohrdrahtfixation.
Weiterbehandlung
Ruhigstellung im Unterarmgips oder Kunststoffverband mit Einschluss des Daumengrundgelenks für 8 Wochen (sowohl Trümmerfrakturen als auch Pseudarthrosen). Keine schweren manuellen Tätigkeiten und Risiko‑/Kontaktsportarten für 12 Wochen. Plattenentfernung nach 6 Monaten bzw. knöcherner Heilung empfohlen.
Ergebnisse
Durch die Stabilisierung mit der winkelstabilen palmaren Skaphoidplatte können – bei richtiger Indikationsstellung – hohe Heilungsraten mit guten funktionellen Ergebnissen erzielt werden.
Abstract
Objective
Stabilization of comminuted fractures and nonunions of the scaphoid with an angular stable low-profile scaphoid plate.
Indications
Scaphoid nonunions with a large palmar defect, second and third surgical procedure after previous stabilization by headless compression screw (HCS). Comminuted fractures of the scaphoid that cannot be sufficiently stabilized by screws.
Contraindications
Radio- and midcarpal osteoarthritis, small proximal pole fragments, fragmentation of the proximal pole.
Surgical technique
The scaphoid is accessed by a palmar approach. After correcting the DISI (dorsal intercalated segment instability) deformity of the lunate and humpback deformity of the scaphoid, the reduction is secured by temporary Kirschner wires. The nonunion is debrided and the bone defect filled with cancellous bone graft. Subsequently the scaphoid plate and the angular stable screw are positioned in the order to place three screws in the proximal and distal fragment of the scaphoid. Comminuted fractures of the scaphoid are fixated by temporary Kirschner wires, then the plate is positioned in the same way as nonunions.
Postoperative management
Comminuted fractures and nonunions of the scaphoid are immobilized by a below-elbow cast or thermoplastic splint with inclusion of the thumb for 8 weeks. No heavy work, high-risk or contact sport activities for 12 weeks. Plate removal is recommended after 6 months or after bony healing.
Results
By stabilizing scaphoid nonunions with a plate, high union rates with good clinical outcome can be achieved if the indication is correct.
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S. Quadlbauer, C. Pezzei, J. Jurkowitsch, H. Krimmer, M. Sauerbier, T. Hausner und M. Leixnering geben an, dass kein Interessenkonflikt besteht.
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F. Unglaub, Bad Rappenau
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R. Himmelhan, Mannheim
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Quadlbauer, S., Pezzei, C., Jurkowitsch, J. et al. Palmare winkelstabile Verplattung von Pseudarthrosen und Trümmerfrakturen des Kahnbeins. Oper Orthop Traumatol 31, 433–446 (2019). https://doi.org/10.1007/s00064-019-00623-0
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DOI: https://doi.org/10.1007/s00064-019-00623-0