Zusammenfassung
Operationsziel
Arthrodese zwischen Skaphoid, Lunatum und Radius mittels winkelstabiler Platte und Entfernung des distalen Skaphoidpols von palmar zur Behandlung einer posttraumatischen oder degenerativen radiokarpalen Arthrose.
Indikationen
Isolierte radiokarpale Arthrose, bei intaktem Mediokarpalgelenk nach fehlverheilten distalen Speichenfrakturen, rheumatoider Arthritis und „scapholunate advanced collapse“ (SLAC) bis Stadium II.
Kontraindikationen
Mediokarpalarthrose, fehlende Compliance des Patienten, SLAC ab Stadium III, Osteitis.
Operationstechnik
Der distale Speichenabschnitt und das Skaphoid werden durch einen beugeseitigen Zugang zwischen Flexor carpi radialis Sehne und A. radialis dargestellt. Nach Ablösen des M. pronator quadratus, Eröffnen der Gelenkkapsel und Korrektur einer evtl. vorhandenen Fehlstellung des Lunatums wird das Skaphoid mit dem Lunatum temporär mit einem Bohrdraht fixiert. Das distale Skaphoidviertel wird mit dem Meißel osteotomiert und entfernt, die palmare Lippe der distalen Speiche abgemeißelt und anschließend der Knorpel zwischen Skaphoid, Lunatum und Radius abgetragen. Nach temporärer Bohrdrahtarthrodese zwischen Radius, Lunatum und Skaphoid wird die winkelstabile Low-profil-Platte (z. B. palmare 2.5 TriLock RSL Fusion Platte [Medartis® Aptus®, Basel, Schweiz]) unter Bildwandlerkontrolle positioniert und im Gleitloch fixiert. Das Skaphoid und Lunatum werden mit je 2 Schrauben in der Platte distal fixiert, der Carpus wird mit einem Codman-Distraktor nach distal geschoben und die Spongiosa eingebracht. Abschließend wird die Platte am Schaft mit winkelstabilen Schrauben fixiert.
Weiterbehandlung
Ruhigstellung in einer Unterarm(‑Kunststoff)-Schiene für 5 Wochen. Nach 2 Wochen Nahtentfernung und Beginn mit aktiver Handtherapie für das Handgelenk. Normale Belastung des Handgelenkes nach 12 Wochen.
Ergebnisse
Durch die radioskapholunäre (RSL) Arthrodese kann bei Vorliegen einer isolierten Radiokarpalarthrose eine deutliche Reduktion der Schmerzsymptomatik bei erhaltener Restbeweglichkeit des Handgelenkes erreicht werden.
Abstract
Objective
Radioscapholunate (RSL) arthrodesis with distal scaphoidectomy using an angular stable plate and palmar access in post-traumatic or degenerative osteoarthritis limited to the radiocarpal joint.
Indications
Osteoarthritis limited to the radiocarpal joint with intact mediocarpal joint after malunited intra-articular distal radius fractures, rheumatoid osteoarthritis, scapholunate advanced collapse (SLAC) up to stage II.
Contraindications
Mediocarpal osteoarthritis, poor patient compliance, SLAC from stage III, osteitis.
Surgical technique
The palmar RSL arthrodesis is performed using the palmar approach between the flexor carpi radialis tendon and the radial artery. After releasing the pronator quadratus muscle, a longitudinal capsulotomy is performed and the radiocarpal joint is inspected. After correction of a volar or dorsal intercalated segmental instability of the lunate, the lunate is temporarily fixed to the scaphoid using a K-wire. The distal quarter of the scaphoid and the palmar rim of the distal radius is resected and the cartilage between the scaphoid, lunate and distal radius is removed. The scaphoid and lunate are temporarily fixed to the distal radius using K‑wires. Under image intensifier control the angular stable low-profile plate (e.g., volar 2.5 Trilock RSL Fusion plate [Medartis® Aptus® Basel, Switzerland]) is fixed to the distal radius in the long-leg hole. The scaphoid and lunate are fixed distally with two screws each. The carpus is pushed distally using a Codeman distractor and the cancellous bone graft is impacted. Finally, the shaft is fixed with angular stable screws.
Postoperative management
Immobilization using a plaster cast or thermoplastic short-arm orthosis for 5 weeks. After 2 weeks, the orthosis can be removed during hand therapy with active wrist and finger exercises. Normal activities permitted after 12 weeks.
Results
Palmar RSL arthrodesis and distal scaphoidectomy using angular stable plate fixation shows a high union rate and pain relief while maintaining good residual mobility of the wrist.
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S. Quadlbauer, M. Leixnering, R. Rosenauer, J. Jurkowitsch, T. Hausner und C. Pezzei geben an, dass kein Interessenkonflikt besteht.
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F. Unglaub, Bad Rappenau
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H.-J. Schütze, Köln
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Quadlbauer, S., Leixnering, M., Rosenauer, R. et al. Radioskapholunäre Arthrodese mit Entfernung des distalen Skaphoidpols von palmar. Oper Orthop Traumatol 32, 455–466 (2020). https://doi.org/10.1007/s00064-020-00651-1
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DOI: https://doi.org/10.1007/s00064-020-00651-1