Ibrahim Obeid

• MD, MSc
• Clinique du dos Bordeaux-Terrefort

Object: Three-column resection osteotomies (3COs) are commonly performed for sagittal deformity but have high rates of reported complications. Authors of this study aimed to examine the incidence of and intercenter variability in major intraoperative complications (IOCs), major postoperative complications (POCs) up to 6 weeks postsurgery, and over...

Purpose Atlantoaxial osteoarthritis is a debilitating condition often resistant to conservative management. In refractory cases, C1-C2 fusion becomes a surgical option. Recent advancements, particularly in 3D navigation, have allowed for more precise and minimally invasive approaches, though there are limited reports on isolated percutaneous C1-C2...

Background Mechanical complications after adult deformity surgery are typically considered as a composite variable. This study aims to differentiate their characteristics and analyze their behavioral patterns based on time-to-onset and predisposing factors. Methods This retrospective observational study analyzed patients from a prospective multice...

Purpose The purpose of this study was to compare the S2-alar-iliac (S2AI) technique with the iliac screw (IS) technique in adult spinal deformity (ASD) patients in terms of clinical and radiographical outcomes, focusing on reoperations, complications, and change in radiographic parameters. Methods This is a retrospective review of a prospective, m...

Background Spinal deformity can have a severe impact on the patient’s sexual health. Eventually, this can lead to depression and relationship distress. Spinal surgical management is suggested to improve sexual function, however, the literature concerning these aspects is still scarce. This study evaluated which factors predicted improvement in sexu...

Purpose The choice of the best management for Adult Spine Deformity (ASD) is challenging. Health-related quality of life (HRQoL), comorbidities, symptoms and spine geometry, along with surgical risk and potential residual disability play a role, and a definite algorithm for patient management is lacking. Machine learning allows to analyse complex s...

Purpose: Machine learning (ML) refers to algorithms (often models ) that are learned directly from data, germane to past experience. As algorithms have constantly been evolving with the exponential increase of computing power and vastly generated data, privacy of algorithms as well as of data becomes extremely important due to regulations and IP ri...

Purpose To assess the radiological outcomes and complications focusing on distal junctional failure (DJF) of adult spinal deformity patients who underwent thoracolumbar fixation with the use of offset sublaminar hooks (OSH) distally. Methods Retrospective review of a prospective, multicenter adult spinal deformity database (2 sites). Inclusion crit...

Purpose Large language models (LLM) have the potential to bridge knowledge gaps in patient education and enrich patient-surgeon interactions. This study evaluated three chatbots for delivering empathetic and precise adolescent idiopathic scoliosis (AIS) related information and management advice. Specifically, we assessed the accuracy, clarity, and...

Objective The purpose was to analyze how rod characteristics, screw density and cages influence the incidence of mechanical complications compared to patient-related factors and alignment in adult spinal deformity instrumented T9-T11 to pelvis. Methods Register data of 302 patients was analyzed. Relative lumbar lordosis (RLL) and relative sagittal...

Study design Multicentric, retrospective analysis of prospectively collected data. Objective To utilize machine-learning (ML) for clustering and management prediction (conservative vs. operative) in surgically treated adult spine deformity (ASD) patients, and to compare the attainment of the Minimum Clinically Important Difference (MCID) between p...

Introduction Global coronal alignment is mainly assessed by C7 plumbline and central sacral vertical line (CSVL), pelvic obliquity and shoulder alignment. A detailed analysis is mandatory when treating spinal deformity. It remains unclear to what extent mild scoliosis influences global coronal alignment. Research question The objective was to defi...

Study Design Retrospective analysis of a prospective multicenter Adult Spinal Deformity (ASD) registry. Objective Assess whether spinal alignment deteriorates post-surgery in absence of mechanical complications and evaluate the long-term outcomes of ASD surgery over a five-year period. Summary of Background Data ASD is prevalent among older adult...

Pedicle subtraction osteotomy has been thoroughly described and studied over the past 2 decades, being applied mainly in the lumbar spine, followed by the thoracic spine. Our better understanding of alignment biomechanics, and the progressive refinements of the surgical technique over time made it a very efficient procedure for the management of fi...

Purpose Outpatient lumbar decompression surgeries have been successfully performed in France for over twenty years, earning acceptance. However, outpatient instrumented lumbar spine procedures and arthroplasties are less documented. This study aimed to evaluate the feasibility, efficiency, and safety of outpatient lumbar instrumented surgery. Meth...

Purpose The Minimal Clinically Important Difference (MCID) is crucial to evaluate management outcomes, but different thresholds have been obtained in different works. Part of this variability is due to measurement error and influence of the database, both essential for calculating the MCID. The aim of this study was to introduce the association of...

Purpose To assess, in a large population of Adult Spinal Deformity (ASD) patients, the true interest of varying the upper anchors as a protective measure against Proximal Junctional Kyphosis (PJK), by analyzing and comparing 2 groups of patients defined according to their proximal construct. Another objective of the study is to look for any other f...

The relationship between rod curvature and postoperative radiographic results is a debated topic. One of the reasons of the heterogeneity of the observed results might reside in the lack of a validated and widely employed method to measure the curvature of the rods. Aim of this study was to present and validate a novel method for rod measurement, w...

Different methods of sagittal alignment assessment compete for predicting adverse events after adult spinal deformity (ASD) surgery. We wanted to study which method provides greater benefit. Retrospective study of 391 patients operated for ASD, with > 6 instrumented levels, fused to the pelvis, and 2 years of follow-up. Three alignment methods were...

Poor restoration of pelvic version after adult spinal deformity (ASD) surgery is associated with an increased risk of mechanical complications and worse quality of life. We studied the factors linked to the improvement of postoperative pelvic version. This is a retrospective analysis of a prospective multicenter ASD database. Selection criteria wer...

Background: Advancements in non-ionizing methods for quantifying spinal deformities are crucial for assessing and monitoring scoliosis. In this study, we analyzed the observer variability of a newly developed digital tool for quantifying body asymmetry from clinical photographs. Methods: Prospective observational multicenter study. Initially, a dig...

Study Design Retrospective analysis of prospectively collected data. Objective To identify the best definition of primary anteverted pelvis in the setting of adult spine deformity (ASD), and to investigate whether this is a pathologic setting that requires surgical correction. Summary of Background Data While pelvic retroversion has been thorough...

The purpose of this study was to determine the isolated influence of smoking in patient-reported outcome measures (PROMs) for adult spinal deformity (ASD) surgery excluding known tobacco-related complications. Retrospective analysis of a prospective multicenter ASD database. Patients operated on ASD with 2 year post-operative follow-up were include...

Background The long-term impact of reoperations following adult spinal deformity (ASD) surgery is still poorly understood. Our aim was to identify the relationship between unplanned reoperation and health-related quality of life (HRQoL) gain at 2 and 5 years of follow-up. Methods We included patients enrolled in a prospective ASD database who unde...

Purpose To compare the sagittal alignment of patients with diverse mechanical complications (MCs) following adult spinal deformity (ASD) surgery with that of patients without MCs. Methods A total of 371 patients who underwent ASD surgery were enrolled. The sagittal spinopelvic parameters were measured preoperatively and at the 6-month and last fol...

Purpose: Machine learning (ML) refers to algorithms (often models) that are learned directly from data, germane to past experience. As algorithms have constantly been evolving with the exponential increase of computing power and vastly generated data, privacy of algorithms as well as of data becomes extremely important due to regulations and IP rig...

Introduction: Surgery to correct spinal deformities in scoliosis involves the use of contoured rods to reshape the spine and correct its curvatures. It is crucial to bend these rods appropriately to achieve the best possible correction. However, there is limited research on how the rod bending process relates to spinal shape in adolescent idiopathi...

Purpose This study aimed to explore the relationships between lumbar lordosis (LL) correction and improvement of postoperative global sagittal alignment and to establish corresponding linear regressions to predict the change in global tilt (GT) based on the corrected LL following adult spinal deformity (ASD) surgery. Methods A total of 240 ASD pat...

Study Design Retrospective multicenter study Objective Our objective was to compare the spline-based measurement of sagittal spinal curvatures to fixed landmarks in a normative population. Summary of Background Data Recent research has stressed the importance of considering sagittal curvature in their entirety using a spline reconstruction. To da...

Study Design/Setting Retrospective cohort study. Objective Assess the extent to which defined risk factors of adverse events are drivers of cost-utility in spinal deformity (ASD) surgery. Methods ASD patients with 2-year (2Y) data were included. Tertiles were used to define high degrees of frailty, sagittal deformity, blood loss, and surgical tim...

Purpose The aims of this study were to explore the correlations between thoracic kyphosis (TK) and lumbar lordosis (LL) parameters and to build corresponding linear regressions to predict TK morphology and the thoracolumbar inflection point (IP) determined by individual LL parameters in asymptomatic adults. Methods A total of 280 adult healthy vol...

Background: Postoperative Flatback has been described in detail for sagittal plane considerations over the past 2 decades, and its correlations with disability is now accepted. Fixed Coronal Malalignment (CM) has been less described, and some authors report no significant association with the clinical outcome. The O-CM classification analyses CM a...

Purpose: Coronal balance is a major factor impacting the surgical outcomes in adult spinal deformity (ASD). The Obeid coronal malalignment (O-CM) classification has been proposed to improve the coronal alignment in ASD surgery. Aim of this study was to investigate whether a postoperative CM < 20 mm and adherence to the O-CM classification could im...

Study design A retrospective study. Objective Relationship between rod and spinal shape in the sagittal plane in adult spinal deformity (ASD) surgery. Background Corrective surgery for adult spinal deformity (ASD) involves the use of contoured rods to correct and modify the spinal curvatures. Adequate rod bending is crucial for achieving optimal...

Background: The objectives of this study are to identify radiological factors associated with good functional outcomes after the implantation of BDYNTM dynamic stabilization system in the setting of painful low-grade degenerative lumbar spondylolisthesis (LDS). Material and methods: In this monocentric, retrospective study, we followed 50 patien...

In response to sagittal malalignment, compensatory spinal and lower extremity mechanisms are recruited. Thoracolumbar realignment surgery has been shown to yield reciprocal changes in these compensations. Thus, whole-body radiographic assessment has come to the fore. This study aimed to evaluate the relationship between spinopelvic parameters and l...

Introduction The Global Alignment and Proportion (GAP) score incorporates three domains directly modified with surgery (relative pelvic version–RPV, relative lumbar lordosis—RLL, lumbar distribution index—LDI) and one indirectly restored (relative spinopelvic alignment—RSA). We analyzed our surgical realignment performance and the consequences of d...

Purpose Different techniques have been previously described to close the pedicle subtraction osteotomy (PSO) site for correction of sagittal malalignment; the use of a side-to-side domino connector as a correction tool in the thoracic spine has not been specifically studied. Methods Twenty adult patients who underwent single-level thoracic PSO fro...

Purpose Pan Lumbar Arthodesis (PLA) are often required for Adult Spinal Deformity (ASD) correction, reducing significantly the compensatory capacity in case of postoperative sagittal malalignment. Few papers have investigated outcomes and complications in this vulnerable subset of patients. The objective of this study was to assess revision surgery...

A recently published article by Zhang et al. in BMC Musculoskeletal Disorders reported that the classification of coronal deformity based on preoperative global coronal malalignment for adult spinal deformity is questionable. The aim of the paper was to specifically discredit the Obeid-Coronal Malalignment (O-CM) classification. In this corresponde...

BACKGROUND Atlantoaxial rotatory dislocation (AARD) in children may be caused by neck trauma or an upper respiratory tract infection. Here the authors describe the very rare association between inflammatory bowel disease and AARD in a child. OBSERVATIONS A 7-year-old girl presented with an 11-month history of torticollis that occurred spontaneousl...

PurposeThe purpose of this study was to determine mid-long-term outcomes (5 years) following surgery for young adult idiopathic scoliosis (YAdIS).Methods This is a retrospective review of a prospective, multicenter adult deformity database including patients operated on idiopathic scoliosis by a single posterior approach, age at surgery between 19...

PurposeThere is scarce information regarding the effectiveness of postoperative braces in decreasing mechanical complications and reinterventions following adult deformity surgery.Methods Retrospective matched cohort study from a prospective adult deformity multicenter database. We selected operated patients, fused to the pelvis, > 6 instrumented l...

Purpose Sagittal malalignment is a risk factor for mechanical complications after surgery for adult spinal deformity (ASD). Spinal loads, modulated by sagittal alignment, may explain this relationship. The aims of this study were to investigate the relationships between: (1) postoperative changes in loads at the proximal segment and realignment, an...

IntroductionThe Oswestry Disability Index (ODI) and the Core Outcome Measures Index (COMI) are two commonly used self-rating outcome instruments in patients with lumbar spinal disorders. No formal crosswalk between them exists that would otherwise allow the scores of one to be interpreted in terms of the other. We aimed to create such a mapping fun...

Background Context There remains significant variability in the use of postoperative opioids. On one end, it is proven that appropriate pain control is a critical aspect of patient management; on the other end, past few decades have been associated with major increases in opioid-related overdoses and addiction treatment. We hypothesized that severa...

Study design National cross-sectional study. Background Thoracic kyphosis (TK) is related to sagittal parameters as pelvic tilt (PT), lumbar lordosis (LL) and pelvic incidence (PI). The equation TK =2 (PT+LL–PI) was validated for adolescents. Objective: to investigate if this equation correctly predicts TK regardless of age. Methods Sagittal alig...