Abstract
Objective
Stabilizing sacral fragility fractures without radiation exposure to the surgical team.
Indications
Non-displaced or minimally displaced unilateral or bilateral transalar, transforaminal or central sacral fractures in weak and osteoporotic bone.
Contraindications
Displaced or highly unstable sacral fractures. Patients under therapeutic anticoagulation. Patients needing fast track orthopedic surgery.
Surgical technique
Prone position. Reference clamp installation on posterior iliac crest. Initial 3D scan of posterior pelvic ring. Image-guided virtual determination of 2–3 interforaminal iliosacroiliac trajectories in sacral vertebrae I and II. Lateral transgluteal mini-open approach. 3D image-guided insertion of 2–3 guide wires along planned trajectories. 3D-scan for controlling guide wire positions. Virtual determination of screw lengths. Cortical drilling and cannulated screw insertion along guide wires. Radiological documentation.
Follow-up
Clinical and radiological follow-up after 12 weeks, 12 and 24 months including radiographs in anteroposterior, lateral, inlet and outlet views.
Results
From October 2011 until October 2016 a total of 124 sacral fracture sites (in sacral vertebrae I and II) were treated with 120 navigated sacral screws in 52 patients (48 females, 4 males; mean age 76 ± 10 years, range 36–90 years) using 3D image guidance for screw placement. Image-guidance accuracy was 99.2% (119/120 screws correctly placed). Complications comprised revision surgery for subfascial hematoma evacuation (n = 1) and screw removal due to loosening after 12 weeks (n = 2). Four patients died before final follow-up. Mean pain visual analogue scale (VAS) decreased from 8.9 ± 1.1 (presurgery value) over 3.6 ± 1.7 (postsurgery value) to 1.8 ± 1.9 (2-year follow-up value), mean Oswestry disability index (ODI) improved from 86.2 ± 4.9% (presurgery value) over 28.5 ± 9.5% (postsurgery value) to 23.3 ± 13.7% (2-year follow-up value).
Zusammenfassung
Operationsziel
Belastungsstabile Schraubenosteosynthese nichtdislozierter Sakrumfrakturen ohne Strahlenbelastung des OP-Personals.
Indikationen
Nicht-/wenig dislozierte ein-/beidseitige und zentrale Sakrumfrakturen bei reduzierter Knochenqualität/Osteoporose.
Kontraindikationen
Dislozierte/hochgradig instabile Sakrumfrakturen. Therapeutische Antikoagulation. Kreislaufinstabilität.
Operationstechnik
Bauchlagerung. Installieren der Navigationsreferenz am hinteren Beckenkamm. 3‑D-Scan des hinteren Beckenrings. Navigierte virtuelle Festlegung von 2–3 interforaminalen iliosakralen Trajektorien im 1. und 2. Sakralwirbel. Minimal-invasiver lateraler transglutealer Zugang. Navigiertes Einbringen von 2–3 Führungsdrähten entlang der geplanten Trajektorien. 3‑D-Scan zur Kontrolle der Führungsdrahtlage. Virtuelle Schraubenlängenbestimmung. Führungsdrahtgeführtes Aufbohren der Kortikalis und Eindrehen der Schrauben. Röntgendokumentation.
Weiterbehandlung
Klinisch-radiologische Nachuntersuchungen nach 12 Wochen, 12 und 24 Monaten mit Röntgenaufnahmen in anteroposteriorem und lateralem Strahlengang sowie Inlet/Outlet-Aufnahmen.
Ergebnisse
Von Oktober 2011 bis Oktober 2016 wurden 52 Patienten (48 Frauen, 4 Männer, Durchschnittsalter 76 ± 10 [Spannweite: 36–90] Jahre) mit insgesamt 124 sakralen Frakturen (S1, S2) mittels 120 navigiert eingebrachter Schrauben versorgt. Die Schraubenplatzierungsgenauigkeit betrug 99,2 % (119/120 korrekt platzierte Schrauben). Komplikationen erforderten Revisionsoperationen bei subfaszialem Hämatom (n = 1) und Schraubenlockerung nach 12 Wochen (n = 2). Nach 2 Jahren waren 4 Patienten verstorben. Im verbliebenen Kollektiv hatte sich das Schmerzniveau von 8,9 ± 1,1 (präoperativ) auf 3,6 ± 1,7 (postoperativ) bis auf 1,8 ± 1,9 (2-Jahres-Nachuntersuchung) VAS-Punkte (visuelle Analogskala), der ODI (Oswestry-Disability-Index) von 86,2 ± 4,9 % (präoperativ) über 28,5 ± 9,5 % (postoperativ) auf 23,3 ± 13,7 % (zum 2‑Jahres-Nachuntersuchungszeitpunkt) gebessert.
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H. Balling declares that he has no competing interests.
All procedures followed were in accordance with the ethical standards of the responsible committee on human experimentation (institutional and national) and with the Helsinki Declaration of 1975 (in its most recently amended version). Informed consent was obtained from all patients included in the study. Additional informed consent was obtained from all individual participants for whom identifying information is included in this article.
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D. Krappinger, Innsbruck
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R. Himmelhan, Mannheim
The device (O‑arm) is U.S. Food and Drug Administration (FDA) approved or approved by a corresponding national agency for this indication.
This research was not sponsored by an organization. The author declares that he has full control of all primary data and allows the journal to review the data if requested.
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Balling, H. 3D image-guided surgery for fragility fractures of the sacrum. Oper Orthop Traumatol 31, 491–502 (2019). https://doi.org/10.1007/s00064-019-00629-8
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DOI: https://doi.org/10.1007/s00064-019-00629-8