Zusammenfassung
Hintergrund
Die Luxation nach endoprothetischem Hüftgelenkersatz stellt eine häufige und schwerwiegende Komplikation dar und ist die Ursache für eine relevante Zahl an hüftendoprothetischen Revisionseingriffen. Die Wahrscheinlichkeit des Auftretens einer Hüfttotalendoprothesen(HTEP)-Luxation ist mit indikations-, patienten- und operationsspezifischen Risikofaktoren assoziiert. Rund die Hälfte der HTEP-Luxationen tritt innerhalb der ersten 3 Monate postoperativ auf (Frühluxation).
Diagnostik
Die Diagnostik der HTEP-Luxation erfolgt klinisch und radiologisch. Die ursächliche Zuordnung wird anhand der Beurteilung der Gelenkstabilität, der knöchernen Situation (Lockerung, periprothetische Fraktur, Defekt) und der Weichteile (pelvitrochantäre Muskulatur) vorgenommen. Bei klinisch oder paraklinisch positiven Infektzeichen bzw. bei Spätluxationen ist die Gelenkpunktion indiziert.
Therapie
Die Festlegung der Therapie erfolgt nach der Ursache (Implantatfehlstellung, pelvitrochantäre Insuffizienz, Impingement, Inkongruenz zwischen Kopf und Inlay, kombinierte Ursachen). Die Therapie der akuten HTEP-Luxation besteht zunächst in der bildwandlerkontrollierten Reposition unter ausreichender Analgesie und Relaxation. Die konservative Therapie erfolgt mit der Ruhigstellung durch eine Hüftgelenkorthese oder einen Becken-Bein-Gips für 6 Wochen. Operative Therapiestrategien bei rezidivierenden Luxationen sind die Herstellung der korrekten Implantatposition sowie einer suffizienten Weichteilspannung. Größere Hüftköpfe, bipolare Köpfe und tripolare Pfannen finden aufgrund der geometrisch geringeren Ausrenkungswahrscheinlichkeit (höhere „jumping distance“) häufig Anwendung. Infektassoziierte HTEP-Luxationen werden nach den Prinzipien der periprothetischen Infekttherapie behandelt. Die Reluxationsrate ist mit bis zu 30 % hoch, daher sollte beim Ausbleiben des Therapieerfolgs die Versorgung in einem Zentrum für Revisionsendoprothetik angestrebt werden.
Schlussfolgerungen
Die Fahndung nach der genauen Ursache einer HTEP-Luxation ist eminent wichtig. Nur deren Kenntnis und die patienten- und implantatspezifischen Details ermöglichen eine Klassifizierung und zeigen Wege bzgl. des therapeutischen Vorgehens. Bei einer Revisionsoperation muss die intraoperative Funktionsdiagnostik exakt dokumentiert werden. Als Gründe für Spätluxationen sind Protheseninfekte, -abrieb und -lockerungen zu hinterfragen.
Abstract
Background
Luxation following endoprosthetic hip replacement represents a frequent and severe complication and is the reason for a relevant number of hip arthroplasty revision interventions. The probability of occurrence of luxation of a total hip arthroplasty is associated with the indications, patient and operation-specific risk factors. Approximately 50 % of luxations after total hip arthroplasty occur within 3 months of the operation (early luxation).
Diagnostics
The diagnostics of luxation of total hip arthroplasty are carried out by clinical and radiological methods. The causative assignment is made by assessment of joint stability, the bony situation (e.g. loosening, periprosthetic fracture and defects) and the soft tissue (e.g. pelvitrochanterian musculature). In cases of clinical and paraclinical signs of infection and of late luxations, a joint puncture is indicated.
Therapy
Therapy decisions are made depending on the cause (e.g. implant malpositioning, pelvitrochanterian insufficiency, impingement, incongruence between head and inlay and combinations of causes). Therapy of acute total hip prosthesis luxation begins with imaging controlled repositioning carried out with the patient under adequate analgesia and sedation. Conservative therapy is carried out by immobilization with a hip joint orthesis or pelvis-leg cast for 6 weeks. Operative therapy strategies for recurrent luxation are restoration of the correct implant position and sufficient soft tissue tension. Larger hip heads, bipolar heads and tripolar cups are more commonly used due to the geometrically lower probability of dislocation (higher jumping distance). Luxation of total hip prostheses due to infection is treated according to the principles of periprosthetic infection therapy. The rate of recurrence of luxation of 30 % is high so that in cases of unsuccessful therapy treatment should best be carried out in a center for revision arthroplasty.
Conclusions
The search for the exact cause of total hip prosthesis luxation is extremely important. A classification is only possible when the exact cause is known and together with patient and implant-specific details the therapeutic approach can be ascertained. In revision operations the intraoperative functional diagnostics must be exactly documented. The reasons for delayed luxations could be prosthesis infections, abrasion and loosening.
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Interessenkonflikt. C. Perka weist auf folgende Beziehungen hin: Berater für Smith & Nephew GmbH, Aesculap, DePuy und Zimmer. B. Preininger und F. Haschke geben an, dass kein Interessenkonflikt besteht. Dieser Beitrag beinhaltet keine Studien an Menschen oder Tieren.
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Preininger, B., Haschke, F. & Perka, C. Diagnostik und Therapie der Luxation nach Hüfttotalprothesenimplantation. Orthopäde 43, 54–63 (2014). https://doi.org/10.1007/s00132-013-2125-x
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DOI: https://doi.org/10.1007/s00132-013-2125-x