Zusammenfassung
Hintergrund
Seit Beschreibung des femoroazetabulären Impingements (FAI) hat sich dessen radiologische Diagnostik ständig weiterentwickelt.
Ziel der Arbeit
Das biomechanische Konzept des FAI wird erläutert und es werden aktuelle Möglichkeiten radiologischer Verfahren bei der Diagnostik dargestellt.
Material und Methoden
Basierend auf einer Literaturrecherche wird der aktuelle Wissensstand, insbesondere zur radiologischen Diagnostik des FAI, in einem Review zusammengefasst. Darüber hinaus wird ein Ausblick auf neue Methoden gegeben.
Ergebnisse
Das FAI beschreibt ein dynamisches Phänomen mit einem mechanischen Konflikt zwischen dem Femurkopf und/oder -hals und dem Azetabulum. Während die Verdachtsdiagnose des FAI klinisch gestellt wird, ist die bildgebende Diagnostik für die Diagnosesicherung und zur Abklärung der zugrundeliegenden Deformitäten des proximalen Femurs (Cam-Deformität) bzw. des Azetabulums (Pincer-Deformität) sowie assoziierter Schäden des Gelenkknorpels und des Labrum unverzichtbar. Basis bildgebender Diagnostik sind a.-p.- und laterale Röntgenaufnahmen. MRT und MR-Arthrographie sind die bevorzugten Verfahren zur detaillierten Analyse von Deformitäten sowie der Detektion und Graduierung von Schäden an Gelenkknorpel (Sensitivität: 58–91 %) und Labrum (Sensitivität: 50–92 %). Gleichzeitig lassen sich mit ihnen andere Hüfterkrankungen ausschließen. Aktueller Stand und neue Entwicklungen der Bildgebung werden aufgezeigt.
Schlussfolgerung
Für die Diagnose des FAI bedarf es typischer klinischer und bildgebender Befunde. Die radiologische Diagnostik ist unverzichtbarer Bestandteil der Diagnosesicherung, der Differenzierung zugrundeliegender Deformitäten und der Beurteilung therapierelevanter Gelenkschäden.
Abstract
Background
Since the first description of the femoroacetabular impingement (FAI) concept diagnostic imaging of FAI has continuously been developed.
Objective
The biomechanical concept is explained and an update on diagnostic imaging of FAI is presented.
Material and methods
Based on a literature search this review article presents the current state of knowledge about FAI mechanisms and gives an overview on state of the art radiological diagnostics. A perspective on new imaging methods is also given.
Results
The FAI is a dynamic phenomenon with a mechanical conflict between the femoral head and/or neck and the acetabulum. It is usually suspected clinically; however, imaging plays an essential role in establishing the diagnosis by detecting and defining the underlying deformities of the proximal femur (cam deformity) and the acetabulum (pincer deformity) and by evaluating associated lesions of the articular cartilage and labrum. Basic imaging diagnostics consist of anteroposterior and lateral radiographs. Magnetic resonance imaging (MRI) and MR arthrography are the preferred imaging modalities for detailed analysis of deformities, for the detection and graduation of lesions of articular cartilage (sensitivity 58–91%) and labral lesions (sensitivity 50–92%). Simultaneously, these methods can exclude other hip diseases. Current standards and new developments in FAI imaging are presented.
Conclusion
For the diagnosis of FAI typical clinical and imaging findings are required. Radiological diagnostics are an indispensable component in establishing the diagnosis of FAI, in the differentiation of the underlying deformities and in the assessment of treatment-relevant joint damage.
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Die Autoren danken Prof. Klaus Wörtler, PD Dr. Florian Schmaranzer und der Fa. Clinical Graphics für die Bereitstellung von Bildmaterial.
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A. Heuck, M. Dienst und C. Glaser geben an, dass kein Interessenkonflikt besteht.
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Heuck, A., Dienst, M. & Glaser, C. Femoroazetabuläres Impingement – Update 2019. Radiologe 59, 242–256 (2019). https://doi.org/10.1007/s00117-018-0486-1
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DOI: https://doi.org/10.1007/s00117-018-0486-1