Abstract
Anterior approaches to the shoulder including different types of subscapularis tendon takedown or incision techniques bear the risk of iatrogenic damage to the subscapularis musculotendinous unit. Irreversible changes of the muscle in particular fatty infiltration with or without failure of the tendon repair may result in permanent loss of subscapularis function. The true incidence of these structural changes is currently unknown. The degree and clinical impact of subscapularis dysfunction varies depending on the damage to the musculotendinous unit. The subscapularis split approach seems to be the most benign approach for open instability repairs with regard to the musculotendinous integrity. The lesser tuberosity osteotomy appears to be a promising approach for total shoulder replacement to avoid tendinous failures postoperatively. In any case the detachment and mobilization of the subscapularis musculotendinous unit should be carried out with respect to the neural innervation of the subscapularis muscle. Strong and if possible anatomic tendon repair techniques should be used and the repaired tendon must be protected postoperatively.
Zusammenfassung
Anteriore Zugangswege zum Schultergelenk mit Ablösung oder Inzision der Subscapularissehne bergen das Risiko einer iatrogenen Schädigung der muskulotendinösen Einheit des Subscapularis. Irreversible Veränderungen des Muskels wie die fettige Infiltration mit oder ohne Versagen der Sehnenrekonstruktion können zu einem permanenten Verlust der Subscapularisfunktion führen. Die genaue Inzidenz ist gegenwärtig nicht geklärt. Die klinischen Auswirkungen scheinen vom Ausmaß der Schädigung der muskulotendinösen Einheit abhängig zu sein. Der Subscapularis-Split stellt gegenwärtig das Verfahren mit der geringsten Zugangsmorbidität für offene Stabilisierungstechniken dar. Die Tuberkulum minus-Osteotomie zur Endoprothesenimplantation repräsentiert einen vielversprechenden Zugang, um tendinöse Insuffizienzen zu vermeiden. In jedem Fall sollte die Ablösung und Mobilisation des Subscapularis unter Schonung der nervalen Innervation des Muskels durchgeführt werden. Anatomische und primärstabile Refixationstechniken sowie ein angepasstes Nachbehandlungsschema tragen dazu bei, die Zugangsmorbidität so gering wie möglich zu halten.
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Scheibel, M., Habermeyer, P. Subscapularisdysfunktionen nach ventralen Zugängen zum Schultergelenk. Obere Extremität 2, 81–89 (2007). https://doi.org/10.1007/s11678-007-0037-2
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DOI: https://doi.org/10.1007/s11678-007-0037-2