Abstract
Objective
Treatment of isolated retropatellar cartilage defects using current gel-type regenerative methods requires settlement of the gel to the underlying subchondral bone under gravity; thus, prone positioned arthroscopy is used.
Indications
Isolated retropatellar contained cartilage defect size >2.5 cm2. Age <40 years, epiphyseal closure, cartilage defect grade 3/4 (International Cartilage Repair Society).
Contraindications
Cartilage defects at medial or lateral femorotibial compartments, at the trochlea, with degenerative genesis, rheumatoid arthritis, local infection, patellar malalignment, patellofemoral dysplasia, knee instability, knee malalignment >3°, kissing lesions.
Surgical technique
Two-stage procedure: At initial arthroscopy, chondrocytes were harvested. At the second stage, the patient was positioned prone and the leg with a thigh tourniquet was fixed in a leg holder. Removal of table extension below the knee and support of foot in sling to prevent knee hyperextension. Placement of 2 lateral portals. Lesion visualized and debrided, followed by aspiration of intra-articular fluid. A loop, placed posterior to the patellar ligament using a lasso, was used to suspend a weight to expand the patellofemoral space. The lesion was then dried using a sponge. NOVOCART® Inject (TETEC, Reutlingen, Germany) administered onto the defect. Gel was allowed to solidify for 15 min and operation was completed.
Postoperative management
Knee locked in extension using a brace for 6 weeks. Continuous passive motion applied and incrementally increased until full range of motion (ROM) at week 6. Weight-bearing as tolerated was allowed with the knee in extension. Routine clinical follow-up after 3, 6 and 12 months.
Results
Mean age of the 5 patients was 23 ± 6 (range 14–30) years; mean follow-up time after surgery 28 ± 7 (range 20–40) months. All patients returned to full activity without residual knee ROM restriction. Clinical examination at the latest follow-up revealed a Kujala score of 90 ± 12 points and Lysholm score of 95 ± 5 points. MRI showed filled cartilage defects in all patients. Mocart score was 63 ± 7 points. Cartilage was inhomogeneous and hyperintense at the repaired site. Quantitative measurement of the patella mobility of the operated knee under a translating force of 10 N showed medial and lateral displacements of 21 ± 5 and 15 ± 2 mm and on the healthy side 22 ± 5 and 19 ± 3 mm, respectively.
Zusammenfassung
Operationsziel
Die Behandlung isolierter retropatellarer Knorpeldefekte mit den derzeit eingesetzten regenerativen Methoden auf Gelbasis erfordert eine Anlagerung des Gels an den subchondralen Knochen unter Schwerkraft, daher Arthroskopie in Bauchlage.
Indikationen
Isolierter, retropatellar begrenzter Knorpelschaden, mindestens 2,5 cm2. Alter unter 40 Jahren, Epiphysenverschluss, Läsion ICRS (International Cartilage Repair Society) Grad 3 und 4.
Kontraindikationen
Knorpelschäden im medialen oder lateralen femorotibialen Kompartiment, im Bereich der Trochlea, mit degenerativer Genese, rheumatoide Arthritis, lokale Infektion, patellares Malalignment, femoropatellare Dysplasie, Knieinstabilität, Knie-Malalignment >3°, „kissing lesions“.
Operationstechnik
Zweizeitiges Verfahren, zuerst arthroskopische Entnahme von Chondrozyten. Zweiter Schritt: Positionierung in Bauchlage, Fixierung des Beins mit Oberschenkeltourniquet im Beinhalter, Entfernung des Beinteils vom Operationstisch. Der Fuß wurde in eine Schlaufe gehängt, um eine Hyperextension im Kniegelenk zu vermeiden. Anlage zweier lateraler Portale. Visualisierung und Débridement der Läsion, Entfernen intraartikulärer Flüssigkeit. Eine mittels Lasso hinter das Ligamentum patellae geführte Schlinge diente zur Aufhängung eines Gewichtes, um damit den femoropatellaren Raum zu erweitern. Nach Trocknen des Defektbereichs Applikation von NOVOCART® Inject (TETEC, Reutlingen). Für die Adhärenz der Zellen wurden 15 min abgewartet, anschließend wurde der operative Eingriff abgeschlossen.
Weiterbehandlung
Streckschiene für 6 Wochen. Passive Bewegung mit CPM(„continuous passive motion“)-Schiene unter schrittweiser Steigerung der Flexion, bis der volle Bewegungsumfang in der 6. Woche erreicht wurde. Vollbelastung war in Streckstellung erlaubt, sobald vom Patienten toleriert. Klinische Nachuntersuchungen routinemäßig nach 3, 6 und 12 Monaten.
Ergebnisse
Das mittlere Alter (n = 5) lag zum Zeitpunkt der Operation bei 23 ± 6 (14–30) Jahren, die mittlere Follow-up-Zeit bei 28 ± 7 (20–40) Monaten. Alle Patienten kehrten ohne Bewegungseinschränkung des Knies zum normalen Aktivitätsniveau zurück. Klinisch Kujala-Score 90 ± 12, Lysholm-Score 95 ± 5 Punkte. Alle MRT-Untersuchungen zeigten einen aufgefüllten Defekt, Mocart-Score 63 ± 7 Punkte. Knorpel an der sanierten Stelle inhomogen und hyperintens. Patellaverschieblichkeit unter 10 N erreichte nach medial 21 ± 4, nach lateral 15 ± 2 mm. Auf der gesunden Seite betrug die Verschieblichkeit nach medial 22 ± 4, nach lateral 19 ± 3 mm.
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M.E. Kayaalp, Y.U. Cirdi, S. Kopf and R. Becker declare that they have no competing interests.
For this article no studies with human participants or animals were performed by any of the authors. All studies performed were in accordance with the ethical standards indicated in each case. All patient evaluations were made in line with the Declaration of Helsinki ethical principles.
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Kayaalp, M.E., Cirdi, Y.U., Kopf, S. et al. Prone-positioned knee arthroscopy for isolated retropatellar cartilage defects with gel-type autologous chondrocyte implantation. Oper Orthop Traumatol 33, 436–444 (2021). https://doi.org/10.1007/s00064-021-00710-1
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DOI: https://doi.org/10.1007/s00064-021-00710-1