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The Endo-Model® rotating hinge for rheumatoid knees

Functional results in primary and revision surgery

Die Rotations- und Scharnierprothese Endo-Model® bei rheumatoider Arthritis am Knie

Funktionelle Ergebnisse chirurgischer Primär- und Revisionseingriffe

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Abstract

Background

Major joints of the lower limbs are commonly affected by rheumatoid arthritis (RA), with consequent pain, loss of function, and progressive disability. Knee replacement represents a useful solution, but a highly constrained implant design is often needed in order to face the severe anatomical deformities and the gross instability that the surgeon may encounter in the rheumatoid knee.

Objectives

The aim of this work was to evaluate the Endo-Model® rotating hinge knee prosthesis implanted in patients affected by RA and severely damaged knees.

Patients and methods

We retrospectively evaluated a series of 38 patients with RA implanted with the Endo-Model® rotating hinge knee prosthesis for primary or revision surgery (mean follow-up 6.1 years; mean age at surgery 71.5 years). At the time of surgery, the mean duration of RA was 13.2 years. Patients were evaluated clinically and radiographically and the Knee Society Score (KSS) was used.

Results

Implant survival at most recent follow-up was 91.7 %. Mean final knee flexion was 102.7 °. The mean KSS was 93.5 (excellent) and 67.1 (good) for clinical and functional score, respectively. Mild pain was present in 10 patients. No sign of malalignment or residual instability was found. No evidence of loosening or implant failure was observed in x-rays.

Conclusion

The Endo-Model® rotating hinge knee prosthesis provides excellent pain relief, functional recovery, and intrinsic knee stability both in complex primary and in revision knee arthroplasty in the majority of patients with severely affected rheumatoid knees.

Zusammenfassung

Hintergrund

Die großen Gelenke der unteren Extremitäten sind häufig von rheumatoider Arthritis (RA) betroffen. Schmerz, Funktionsverlust und eine fortschreitende Behinderung sind die Folge. Eine Kniegelenkprothese ist in diesem Zusammenhang eine hilfreiche Behandlungsoption. Oft ist aber ein Implantat mit hochgradiger Koppelung erforderlich, um den schwerwiegenden anatomischen Deformitäten und der ausgeprägten Instabilität zu begegnen, die der Chirurg im betroffenen Knie vorfinden kann.

Zielsetzung

Ziel dieser Arbeit war es, die Rotations- und Scharnierknieprothese Endo-Model® nach Implantation in Patienten mit RA und schwer geschädigten Knien zu bewerten.

Patienten und Methoden

Eine Gruppe von 38 Patienten mit RA, denen die Rotations- und Scharnierknieprothese Endo-Model® in chirurgischen Primär- oder Revisionseingriffen eingesetzt worden war, wurde retrospektiv untersucht (durchschnittliches Follow-up 6,1 Jahre; durchschnittliches Alter bei Operation 71,5 Jahre). Zum Zeitpunkt des chirurgischen Eingriffs lag die durchschnittliche Erkrankungsdauer der RA bei 13,2 Jahren. Die Patienten wurden klinisch sowie röntgenologisch untersucht und mithilfe des Knee Society Score (KSS) beurteilt.

Ergebnisse

Der Implantaterhalt lag in der aktuellsten Follow-up-Untersuchung bei 91,7 %. Der letzte Kniebeugewinkel betrug 102,7 °. Die durchschnittlichen Werte des KSS beliefen sich auf 93,5 (hervorragend) und 67,1 (gut) für den klinischen bzw. funktionellen Score. Bei 10 Patienten bestand ein leichter Schmerz. Zeichen einer Fehlstellung oder verbleibenden Instabilität fanden sich nicht. Die Röntgenuntersuchung ergab keine Hinweise auf eine Lockerung oder ein Implantatversagen.

Schlussfolgerung

Die Rotations- und Scharnierknieprothese Endo-Model® bietet der Mehrzahl der Patienten, die von einer schweren RA am Knie betroffen sind, eine hervorragende Schmerzlinderung, funktionelle Erholung und intrinsische Kniestabilität sowohl bei komplexer Primäroperation als auch bei Revisionsendoprothetik.

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Correspondence to M. Alessio-Mazzola.

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L. Felli, M. Coviello, M. Alessio-Mazzola and M. Cutolo state that there are no conflicts of interest.

All studies on humans described in the present manuscript were carried out with the approval of the responsible ethics committee and in accordance with national law and the Helsinki Declaration of 1975 (in its current, revised form). Informed consent was obtained from all patients included in studies

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Felli, L., Coviello, M., Alessio-Mazzola, M. et al. The Endo-Model® rotating hinge for rheumatoid knees. Orthopäde 45, 446–451 (2016). https://doi.org/10.1007/s00132-015-3193-x

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