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Kaustubh Ahuja Department of Orthopaedic Surgery, All India Institute of Medical Sciences, Uttarakhand, India

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Syed Ifthekar Department of Orthopaedic Surgery, All India Institute of Medical Sciences, Uttarakhand, India

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Samarth Mittal Department of Orthopaedic Surgery, All India Institute of Medical Sciences, Uttarakhand, India

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Gagandeep Yadav Department of Orthopaedic Surgery, All India Institute of Medical Sciences, Uttarakhand, India

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Bhaskar Sarkar Department of Orthopaedic Surgery, All India Institute of Medical Sciences, Uttarakhand, India

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Pankaj Kandwal Department of Orthopaedic Surgery, All India Institute of Medical Sciences, Uttarakhand, India

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Introduction Spinal instability constitutes an important indication for surgical stabilization in a number of spinal pathologies. Since the time of the description of the ‘middle path regime’ by Tuli in 1975, spinal instability has constituted

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Nick Evans University Hospital of Wales, Cardiff, UK

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Michael McCarthy University Hospital of Wales, Cardiff, UK

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affected. It is thought to be triggered by a degenerate disc that becomes incompetent. The anteroposterior translational shear forces that arise from longstanding soft-tissue instability accelerate the degenerative changes observed in the facet joints until

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Amer Sebaaly Department of Orthopedic Surgery, Bellevue Medical Center University Hospital, Faculty of Medicine, Saint Joseph University, Lebanon.
Department of Orthopedic Surgery, Spine Unit, Centre Hospitalier de l’Université de Montréal (CHUM), Canada.

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Maroun Rizkallah Department of Orthopedic Surgery, Bellevue Medical Center University Hospital, Faculty of Medicine, Saint Joseph University, Lebanon.

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Guillaume Riouallon Department of Orthopedic Surgery, Groupe Hospitalier Paris Saint Joseph, France.

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Zhi Wang Department of Orthopedic Surgery, Spine Unit, Centre Hospitalier de l’Université de Montréal (CHUM), Canada.

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Pierre Emmanuel Moreau Department of Orthopedic Surgery, Groupe Hospitalier Paris Saint Joseph, France.

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Falah Bachour Department of Orthopedic Surgery, Bellevue Medical Center University Hospital, Faculty of Medicine, Saint Joseph University, Lebanon.

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Ghassan Maalouf Department of Orthopedic Surgery, Bellevue Medical Center University Hospital, Faculty of Medicine, Saint Joseph University, Lebanon.

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protect neural elements and maintain/restore neurologic function; (2) to prevent or correct segmental collapse and deformity; (3) to prevent spinal instability and pain; (4) to permit early ambulation and return to function; and (5) to restore normal

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Emmanuelle Ferrero Service de chirurgie orthopédique, Hôpital européen Georges Pompidou, France, APHP, Université Paris V

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Pierre Guigui Service de chirurgie orthopédique, Hôpital européen Georges Pompidou, France, APHP, Université Paris V

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laminectomy or lamino-arthrectomy. Nevertheless, fusion is often associated with decompression to avoid posterior instability. Single anterior fusion for indirect decompression Local instability and slipping increases radicular compression; therefore

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Juan Ignacio Cirillo Hospital del Trabajador, Santiago, Chile
Clínica Universidad de los Andes, Santiago, Chile
Universidad Andrés Bello, Hospital del Trabajador, Facultad de Medicina, Santiago, Chile

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Guillermo A Ricciardi Centro Médico Integral Fitz Roy, Buenos Aires, Argentina
Sanatorio Güemes, Buenos Aires, Argentina
Hospital General de Agudos Dr. Teodoro Álvarez, Buenos Aires, Argentina

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Facundo Lisandro Alvarez Lemos Hospital Roberto del Río, Santiago, Chile

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Alfredo Guiroy Elite Spine Health and Wellness Center, Florida, USA

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Ratko Yurac Department of Orthopedic and Traumatology, University del Desarrollo, Santiago, Chile
Spine Unit, Department of Traumatology, Clínica Alemana, Santiago, Chile

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Klaus Schnake Center for Spinal and Scoliosis Surgery, Malteser Waldrankenhaus St. Marien, Erlangen, Germany
Department of Orthopedics and Traumatology, Paracelsus Private Medical University Nuremberg, Nuremberg, Germany

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AO Spine Latin America Trauma Study Group
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AO Spine Latin America Trauma Study Group

( 4 ). The failure of the nonoperative treatment was reported in about 20% of the cases, probably due to missed mechanical instability. The torpid evolution of isolated cervical spine facet fractures can result in persistent cervical pain, subsequent

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Charles Court Department of Orthopedic Surgery and Traumatology, Spine and tumor Unit, Bicetre University Hospital, Assistance Publique Hôpitaux de Paris, Paris Saclay University, Le Kremlin-Bicêtre, France

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Leonard Chatelain Department of Orthopedic Surgery and Traumatology, Spine and tumor Unit, Bicetre University Hospital, Assistance Publique Hôpitaux de Paris, Paris Saclay University, Le Kremlin-Bicêtre, France

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Barthelemy Valteau Department of Orthopedic Surgery and Traumatology, Spine and tumor Unit, Bicetre University Hospital, Assistance Publique Hôpitaux de Paris, Paris Saclay University, Le Kremlin-Bicêtre, France

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Charlie Bouthors Department of Orthopedic Surgery and Traumatology, Spine and tumor Unit, Bicetre University Hospital, Assistance Publique Hôpitaux de Paris, Paris Saclay University, Le Kremlin-Bicêtre, France

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 = partial fracture with no instability including transverse fracture of the sacrum below S2; type B = fracture with horizontal instability; type C = fracture with vertical instability. In type B, the vertical opening of the posterior lesion can occur at the

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Augusto Covaro ICATME, Institut Universitari Quirón-Dexeus, Barcelona, Spain

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Gemma Vilà-Canet ICATME, Institut Universitari Quirón-Dexeus, Barcelona, Spain

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Ana García de Frutos ICATME, Institut Universitari Quirón-Dexeus, Barcelona, Spain

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Maite T. Ubierna ICATME, Institut Universitari Quirón-Dexeus, Barcelona, Spain

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Francesco Ciccolo ICATME, Institut Universitari Quirón-Dexeus, Barcelona, Spain

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Enric Caceres Universitat Autónoma de Barcelona, Spain

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on the use of decompression alone to manage degenerative spondylolisthesis were published by Epstein 35 and Kristof, 36 with good to excellent outcomes in older patients without dynamic instability on lateral radiographs (82.0% and 73

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Michaël Moeri Division of Orthopaedic and Trauma Surgery, Geneva University Hospitals, Switzerland

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Dominique A. Rothenfluh Oxford University Hospitals NHS Foundation Trust, Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences (NDORMS), University of Oxford, UK

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Christoph J. Laux Division of Orthopaedic and Trauma Surgery, Geneva University Hospitals, Switzerland

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Dennis E. Dominguez Division of Orthopaedic and Trauma Surgery, Geneva University Hospitals, Switzerland
Oxford University Hospitals NHS Foundation Trust, Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences (NDORMS), University of Oxford, UK

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Orthopaedics and Trauma has declared two major goals of diagnostics for the cervical spine: ‘precise morphologic detection and quantification of instability as a possible source of secondary pain syndromes, deformity or neurologic damage’, and ‘detection of

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Eduardo Moreira Pinto Orthopaedic and Traumatology Surgery, Spine Division, Entre Douro e Vouga Hospital Center, Santa Maria da Feira, Portugal

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Artur Teixeira Orthopaedic and Traumatology Surgery, Spine Division, Entre Douro e Vouga Hospital Center, Santa Maria da Feira, Portugal

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Ricardo Frada Orthopaedic and Traumatology Surgery, Spine Division, Entre Douro e Vouga Hospital Center, Santa Maria da Feira, Portugal

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Pedro Atilano Orthopaedic and Traumatology Surgery, Spine Division, Entre Douro e Vouga Hospital Center, Santa Maria da Feira, Portugal

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António Miranda Orthopaedic and Traumatology Surgery, Spine Division, Entre Douro e Vouga Hospital Center, Santa Maria da Feira, Portugal

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leading to clinical symptoms, such as radiculopathy, stenosis and instability. 9 , 10 Nevertheless, there are a few reports considering reoperation rate as being the most reliable parameter to define ASD, despite clinical symptoms. 11 The incidence of

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Spyridon Sioutis First Department of Orthopaedics, National and Kapodistrian University of Athens, School of Medicine, Athens, Greece

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Lampros Reppas First Department of Orthopaedics, National and Kapodistrian University of Athens, School of Medicine, Athens, Greece

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Achilles Bekos First Department of Orthopaedics, National and Kapodistrian University of Athens, School of Medicine, Athens, Greece

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Eleftheria Soulioti Second Department of Anaesthesiology, National and Kapodistrian University of Athens, School of Medicine, Athens, Greece

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Theodosis Saranteas Second Department of Anaesthesiology, National and Kapodistrian University of Athens, School of Medicine, Athens, Greece

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Dimitrios Koulalis First Department of Orthopaedics, National and Kapodistrian University of Athens, School of Medicine, Athens, Greece

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Georgios Sapkas First Department of Orthopaedics, National and Kapodistrian University of Athens, School of Medicine, Athens, Greece

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Andreas F. Mavrogenis First Department of Orthopaedics, National and Kapodistrian University of Athens, School of Medicine, Athens, Greece

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which require reoperation. 25 , 47 , 62 , 100 Intraoperative death is the most serious complication caused by anaphylactic reaction during surgery due to cyst rupture; the organism is highly immunogenic. 85 Vertebral column instability is

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