Zusammenfassung
Epidemiologie
Traumatische Beckenringfrakturen sind vergleichsweise selten, erhöhen jedoch das Mortalitätsrisiko. Nach Verletzungsmechanismus und Hauptvektor der Energieeinwirkung unterscheidet man die anteroposteriore Kompression, die laterale Kompression und die vertikale Scherung (Young-Burgess-Klassifikation), während die stabilitätsbezogene Klassifikation nach Tile zwischen Typ A (stabil), Typ B (rotatorisch instabil) und Typ C (komplett instabil) unterscheidet. Beide Klassifikationen finden Eingang in die AO/OTA-Klassifikation.
Radiologische Frakturdiagnostik
Die Projektionsradiographie besitzt eine schlechte Sensitivität, wird aber noch zur Erkennung hochinstabiler Beckenfrakturen eingesetzt. Die CT stellt die diagnostische Modalität der Wahl dar (Sensitivität bis 100 %). Neben der Frakturklassifikation erlaubt sie auch die sichere Mitbeurteilung assoziierter Gefäß- und Harnblasen‑/Harnröhrenverletzungen sowie großer Weichteileinblutungen. Frühe Insuffizienzfrakturen des Beckens sowie Cauda- und Plexusverletzungen können besser mit der MRT erfasst werden. Angiographie, Sonographie und nuklearmedizinische Methoden stellen zusätzliche wichtige diagnostische und therapeutische Verfahren dar.
Empfehlung für die Praxis
Die Kenntnis grundsätzlicher pelviner Traumamechanismen ist wichtig, um traumatische Beckenfrakturen in ihrer potenziellen Schwere zu erfassen und hinsichtlich ihrer Stabilität richtig zu klassifizieren. Typische Begleitverletzungen bei Beckenringfrakturen müssen bekannt sein, sollten sicher diagnostiziert und dem Kliniker kommuniziert werden. Dabei bleibt die CT das „diagnostische Arbeitspferd“. Bei Fragilitätsfrakturen des Beckens ist auf den oftmals prolongierten Verlauf mit Frakturprogredienz zu achten, weswegen die MRT hier einen besonderen Stellenwert besitzt.
Abstract
Epidemiology
Traumatic fractures of the pelvic ring are relatively rare, but are associated with increased risk of mortality. Depending on injury mechanism and main vector of energy impact, a distinction is made between anteroposterior compression, lateral compression, and vertical shear (Young and Burgess classification), while the stability-related classification according to Tile distinguishes between type A (stable), type B (rotationally unstable) and type C (completely unstable). A comprehensive modern classification is given by the AO/OTA.
Radiological fracture diagnosis
Plain pelvis x‑rays lack sufficient sensitivity but are still used to detect highly unstable pelvic fractures. CT has superior sensitivity and specificity. In addition to fracture classification, CT allows reliable assessment of associated vascular and bladder/urethral injuries and large soft tissue hemorrhage. MRI is unparalleled in showing bone marrow edema, cauda and plexus complications, and peripelvic soft tissue damage. MRI may also prove to be a valuable diagnostic tool for pelvic ring injuries in children, adolescents and young women, provided they are hemodynamically stable. Angiography, ultrasonography and bone scintigraphy are additional important diagnostic and therapeutic options.
Practical recommendations
Knowledge of basic pelvic trauma mechanisms is important to understand the potential severity of traumatic pelvic fractures and to classify them correctly in terms of stability. Being familiar with typical concomitant injuries in pelvic ring fractures allows reliable diagnosis and their communication with the clinician. CT remains the “diagnostic workhorse”. In fragile pelvic fractures, the often prolonged course with fracture progression must be taken into account, which is why MRI is of particular importance herein.
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Danksagung
Der Autor dankt ausdrücklich den Herren Professor Dr. Dr. Edgar Mayr, Direktor der Klinik für Unfallchirurgie, Orthopädie, plastische und Handchirurgie am Universitätsklinikum Augsburg, und Professor Dr. Dr. Stefan Wirth, Chefarzt der Radiologie am Donau-Isar-Klinikum Deggendorf, für ihre sorgfältige Manuskriptdurchsicht und die wertvollen Anregungen zum Thema.
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Grieser, T. Radiologische Diagnostik von Beckenringfrakturen. Radiologe 60, 226–246 (2020). https://doi.org/10.1007/s00117-020-00656-8
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DOI: https://doi.org/10.1007/s00117-020-00656-8