Zusammenfassung
Sprunggelenkdistorsionen stellen die häufigste Verletzung der unteren Extremität dar. Diese können zu Bandverletzungen und osteochondralen Läsionen führen. Bis zu 50 % der Patienten mit akuten Sprunggelenkfrakturen oder -distorsionen weisen eine Schädigung des Knorpels und/oder der darunter liegenden subchondralen Knochenschichten als Folge der Verletzung auf. Eine spontane Heilung ist in Fällen von „bone bruise“ im subchondralen Knochen in allen Altersstufen, bei isolierten Knorpelverletzungen jedoch nur bei pädiatrischen Patienten möglich. In vielen Fällen führen chondrale oder osteochondrale Verletzungen zu einer zunehmenden Demarkierung des betroffenen Bezirks und können, wenn nicht rechtzeitig erkannt und therapiert, eine schleichende Degeneration des betroffenen Gelenks bewirken. Eine weitere Gruppe osteochondraler Veränderungen sind unklarer Genese und werden dem Überbegriff der Osteochondrosis dissecans zugeordnet. Durchblutungsstörungen werden als eine von mehreren möglichen Ursachen dieser Veränderungen diskutiert.
Durch die heute wesentlich sensitivere Diagnostik mit MRT und CT können chondrale und osteochondrale Defekte bereits frühzeitig einer entsprechenden Therapie zugeführt werden. Eine ausschließliche konservative Therapie ist nur bei pädiatrischen Patienten mit Chancen auf Ausheilung verbunden. Beim Erwachsenen sind konservative Maßnahmen lediglich als Adjuvans zur operativen Therapie zu betrachten.
Anhand einer umfassenden Literaturrecherche werden aktuelle Konzepte der arthroskopischen Behandlung (osteo-)chondraler Verletzungen und Veränderungen am Talus vorgestellt und kritisch beleuchtet. Dominierend in der arthroskopischen Therapie sind Mikrofrakturtechniken mit Kürettage bzw. retrograde Anbohrungen bei erhaltenem Knorpelüberzug. Die Implantation von juvenilem Knorpelgranulat oder autologer Chondrozyten ist ebenfalls in arthroskopischer Technik möglich. Osteochondrale Frakturen („flake fracture“) werden in der Regel arthroskopisch gestützt mini-offen versorgt. Knorpel-Knochen-Transplantationen (OATS), Implantation von Membranen mit oder ohne Spongiosaplastik, evtl. mit Wachstumsfaktoren bzw. Stammzellen werden kombiniert arthroskopisch/mini-offen durchgeführt. Die Ergebnisse der Literatur werden durch eigene Ergebnisse ergänzt und diskutiert.
Abstract
Ankle sprains are the most relevant injuries of the lower extremities and can lead to damage to ligaments and osteochondral lesions. Up to 50 % of patients with a sprained ankle later develop a lesion of the cartilage in the ankle joint or an osteochondral lesion of the talus. This can lead to osteoarthritis of the injured ankle joint. Spontaneous healing is possible in all age groups in cases of a bone bruise in the subchondral bone but in isolated chondral injuries is only useful in pediatric patients. In many cases chondral and osteochondral injuries lead to increasing demarcation of the affected area and can result in progressive degeneration of the joint if not recognized in time. There also exist a certain number of osteochondral changes of the articular surface of the talus without any history of relevant trauma, which are collectively grouped under the term osteochondrosis dissecans. Perfusion disorders are discussed as one of many possible causes of these alterations. Nowadays, chondral and osteochondral defects can be treated earlier due to detection using very sensitive magnetic resonance imaging (MRI) and computed tomography (CT) techniques. The use of conservative treatment only has a chance of healing in pediatric patients. Conservative measures for adults should only be considered as adjuvant treatment to surgery.
Based on a comprehensive analysis of the current literature, this article gives an overview and critical analysis of the current concepts for treatment of chondral and osteochondral injuries and lesions of the talus. With arthroscopic therapy curettage and microfracture of talar lesions are the predominant approaches or retrograde drilling of the defect is another option when the chondral coating is retained. Implantation of autologous chondral cells or homologous juvenile cartilage tissue is also possible with arthroscopic techniques. Osteochondral fractures (flake fracture) are usually performed as a mini-open procedure supported by arthroscopy. The use of the osteochondral autograft transfer system (OATS), implantation of membranes with or without autologous bone marrow transfer and possibly with growth factors or implantation of stem cells are carried out in combination with arthroscopic mini-open procedures. The results from the literature are discussed and compared with own results after arthroscopic treatment of chondral lesions of the talus.
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Thomas, M., Jordan, M. & Hamborg-Petersen, E. Arthroskopische Behandlung von Knorpelverletzungen am Sprunggelenk. Unfallchirurg 119, 100–108 (2016). https://doi.org/10.1007/s00113-015-0136-2
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DOI: https://doi.org/10.1007/s00113-015-0136-2