Zusammenfassung
Chronische Instabilitäten des Akromioklavikulargelenks (AC-Gelenk) sind das Resultat übersehener oder insuffizient behandelter akuter Luxationen. Im Unterschied zu den akuten Verletzungen ist das biologische Heilungspotential aufgrund des posttraumatischen Intervalls kompromittiert und somit die Behandlung erschwert. Die Diagnostik chronischer Instabilitäten sollte daher die differenzierte Erfassung unterschiedlicher Instabilitätskomponenten (statisch vs. dynamisch, vertikal vs. horizontal) anhand einer eigenständigen Klassifikation (Hedtmann und Heers) beinhalten, um in eine zielgerichtete operative Therapie zu münden. Eine eigene Technik zur operativen Stabilisation wurde biomechanisch evaluiert. Die Technik beinhaltete einen modifizierten Transfer des coracoacromialen Bandes (CA-Band) in Kombination mit einer minimal invasiven korakoklavikulären Augmentation (MINAR). Die Technik ist in der Lage, das anteriore und superiore Translationsverhalten des intakten AC-Gelenkes wiederherzustellen. Allerdings bleibt die posteriore Translation gegenüber dem intakten Gelenk erhöht (127%: 3,8 mm intakt vs. 4,6 mm rekonstruiert; p<0,05). Die biomechanischen Ergebnisse der eigenen Studie decken sich mit den Ergebnissen anderer Autoren, die die posteriore Instabilität als kritische Variable bei der Rekonstruktion chronischer AC-Gelenksverletzungen ermittelten. Daher scheint eine additive Augmentation der AC-Bänder (postero-superior), der primären dorsalen Stabilisatoren des AC-Gelenkes, vorteilhaft. Die vorgestellte Technik kann als Alternative zu invasiven Rekonstruktionstechniken auf der Basis von autologen Sehnentransplantaten (M. semitendinosus, M. gracilis) dienen.
Abstract
Chronic instability of the acromioclavicular joint (AC joint) results if the initial acromioclavicular joint luxation has been missed or if the rehabilitative or surgical treatment was not successful. Late repairs after a traumatic luxation are difficult to deal with because the biological healing response for reconstitution of the ligaments seems to be compromised. A meticulous diagnostic examination should be performed paying special attention to the character and direction of instability (static versus dynamic and vertical versus horizontal). For this purpose a specified classification system should be used (Hedtmann and Heers). A new surgical technique for stabilization of chronic AC joint instability has been established and biomechanically evaluated. The technique includes an augmented modified coracoacromial ligament (only the medial half of the ligament) transfer supplemented by coracoclavicular polyester augmentation. In an in vitro model the technique was shown to restore anterior and superior translation of the intact AC joint. An increase of translation compared to the level of the intact joint was statistically significant only for the posterior direction (127%, 3.8 mm intact versus 4.6 mm following reconstruction; p<0.05). Therefore, for further improvement of the technique some form of acromioclavicular ligament reconstruction (posterosuperior) could be profitable. In conclusion the presented surgical technique (augmented CA ligament transfer) reveals promising biomechanical results in an in vitro model and may serve as an alternative to current coracoclavicular ligament reconstruction techniques using autologous tendon grafts.
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Wellmann, M., Zantop, T., Waizy, H. et al. Aktuelle operative Therapiestrategien bei chronischer Akromioklavikularsgelenkinstabilität. Obere Extremität 4, 39–45 (2009). https://doi.org/10.1007/s11678-009-0017-9
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DOI: https://doi.org/10.1007/s11678-009-0017-9
Schlüsselwörter
- AC-Gelenk
- Chronische Instabilität
- Weaver-Dunn-Technik
- Autologes Sehnentransplantat
- Korakoklavikuläre Bandrekonstruktion.