AO Spine Webinar—Management of L4-L5: Instability with Asymptomatic Disc Disease at L3-L4 or L5-S1
Dübendorf, Switzerland
27 Nov 2020
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Welcome to the Event Room for the AO Spine Webinar—Management of L4-L5 Instability with Asymptomatic Disc Disease at L3-L4 or L5-S1

Moderators: S. Rajasekaran

Berjano Pedro
Diwan Ashish
Lamartina Claudio
Pejrona Matteo
Vialle Emiliano


Evidence based medicine and randomized prospective controlled trials are the basis of clinical medicine today. While we strongly rely on this evidence, the practicing surgeon frequently encounters clinical scenarios for which solutions from such trials are not possible.

The AO Spine Clinical Expert Advice Forums aims to fill that void, by documenting experts’ advice on different everyday clinical scenarios, from diagnosis, or management decisions, to intra-op events or post-operative complications.

Segmental instability at the L4-L5 level is a very common condition in lumbar pathology. Common causes of instability include advanced disc degeneration, spondylolisthesis, spondylolysis, and post-laminectomy syndrome. In many cases, L4-L5 is the only affected level, while adjacent segments show no critical illness. In some patients, an incipient deformity may be recognized together with the segmental instability, but the deformity is not severe or symptomatic.

Surgical management of L4-L5 instability consists of segmental fusion, which can be achieved through different techniques and approaches depending on the surgeon’s preferences and the patient’s condition. To provide guidance on the management of segmental instability at the L4-L5 level, the lead author (Matteo Pejrona (EP)) asked four expert spine surgeons (Pedro Berjano (PB), Ashish Diwan (AD), Emiliano Vialle (EV), and Claudio Lamartina (CL)) from three continents to advise on two case studies. A classification strategy is also presented to help clinicians determine appropriate treatment options for L4-L5 instability.


The event starts on November 27th at 12:00 Central European Time.

Please check your local time for the webinar here.

To log-in: A link will be emailed to all registered participants about 20 minutes prior to the start.


The webinar will run under Adobe Connect. Please use preferably Google Chrome as browser for best results.

Type AOSpine
Level Advanced
Region Europe and Southern Africa
Language(s) English
Scope Sub Regional
Academic status Non peer reviewed
Format Webinar
Content Case studies, Lectures
Target audience Neurosurgeon, Orthopedic surgeon, Resident, Spine surgeon
Closing date27 Nov 2020
Available places299
Cancellation policyNo cancellation fee
Euro 0.00 EUR
Registration and time of live event

This educational event is free of charge to all surgeons, globally.

Please register in order to receive the webinar link by email.
The event starts on  November 27th at 12:00 pm Central European Time

Please click here to find your regional time and date.

Intellectual Property
Course materials, presentations, and case studies are the intellectual property of the course faculty. All rights are reserved. Check hazards and legal restrictions on

Recording, photographing, or copying of lectures, practical exercises, case discussions, or any course materials is strictly forbidden. Participants violating intellectual property will be dismissed. 

The AO Foundation reserves the right to film, photograph, and audio record during their events. Participants must understand that in this context they may appear in these recorded materials. The AO Foundation assumes participants agree that these recorded materials may be used for AO marketing and other purposes, and made available to the public.
Ms Catherine Antonetti (Project Manager)
AO Spine ESA
Project Manager
Stettbachstrasse 6
8600 Dübendorf
Mr Fernando Kijel (Project Manager)
AO Spine
Community Development
Stettbachstrasse 6
9475 Sevelen
Phone+41 44 802 65 17