Assessing the Socio-Psychological Determinants of Sagittal Balance (PSYPOS 2)

Assessing the Socio-Psychological Determinants of Sagittal Balance - PSYPOS2

The research focuses on describing the association between socio-psychological factors, collected through standardized self-questionnaires, and the postural alignment of patients without spinal pathology consulting in the orthopaedic surgery department, as evaluated on EOS® radiographic images. This mono-centric, analytical, non-interventional, cross-sectional epidemiological study has for primary outcome to explore the relationship between socio-psychological factors and posture in patients with a healthy spine.

Study Overview

• Status: Not yet recruiting
• Conditions: Posture; Sagittal Balance; Healthy Spine; Socio-Psychological Factors
• Intervention / Treatment: Diagnostic test: Patient consulting in spine surgery

Detailed Description

• This study investigates the association between socio-psychological factors, collected through standardized self-questionnaires, and the postural alignment of patients without spinal pathology consulting in the orthopaedic surgery department, as evaluated on EOS® radiographic images. This mono-centric, analytical, non-interventional, cross-sectional epidemiological study has for primary outcome to explore the relationship between socio-psychological factors and posture in patients with a healthy spine.
• Posture, or sagittal balance, is a key aspect of spinal function. Considering sagittal balance is essential because its alteration leads to a decrease in quality of life and can quickly become a source of disability. Its analysis is conducted using defined parameters on spinal radiographs and is crucial for understanding spinal pathologies. Links between low back pain and posture have already been clearly reported, as well as between low back pain and socio-psychological factors. There is also evidence in the literature suggesting a relationship between socio-psychological factors and sagittal balance but these data are rare and fragmented, even though this association could be particularly pronounced in patients with spinal pathologies requiring surgical intervention.

However, it seems worthwhile to investigate this association between posture and socio-psychological characteristics in patients without spinal pathology to understand the link with other confounding or intermediate factors.

Furthermore, this association could be responsible for some of the variability in clinical and radiological outcomes of treatments, particularly surgical ones, with the presence of poor postoperative clinical outcomes despite adequate restoration of sagittal balance.

o This analytical, non-interventional study requires only one scheduled consultation within the care pathway of patients without spinal pathology consulting in the orthopaedic surgery department of the University Hospital of Bordeaux and undergoing EOS radiography as part of their care pathway. During this consultation, radiographic data and questionnaire responses will be collected.

• Study Type: Interventional
• Enrollment (Estimated): 150
• Phase: Not Applicable

Contacts and Locations

• Study Contact: Name: Benjamin BOUYER, PROF; Phone Number: +335 56 79 87 18; Email: b.bouyer@chu-bordeaux.fr
• Study Contact Backup: Name: William GERBEAUX; Email: william.gerbeaux@chu-bordeaux.fr

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: Adult; Older Adult
• Accepts Healthy Volunteers: No

Description

Inclusion Criteria:

• Patient aged ≥ 18 years
• Patient consulting at the investigational center (orthopaedic surgery department of Bordeaux University Hospital) who has undergone or will undergo an EOS® radiography as part of their treatment pathway (particularly in the context of a preoperative assessment for hip arthroplasty).
• Affiliation with a medical insurance scheme under the French National Health Insurance.

Exclusion Criteria:

• Spinal fusion at any operated level,
• Active or non-active spinal infection at any level,
• Spinal fracture at any level,

• Spinal deformity:

  • Scheuermann's disease (at least 3 adjacent vertebrae with wedge deformity and kyphosis increased by 5 degrees),
  • Scoliosis (Cobb angle > 10 degrees and vertebral rotation).
• History of Parkinson's disease
• Active cancer or hematologic disorder with bone involvement
• Any condition preventing the ability to respond to questionnaires with discernment
• Neurological deficit requiring urgent surgical intervention
• Hyperalgesic condition requiring urgent surgical intervention
• Polytrauma with organ failure
• Patient unable to understand study-related information
• Patient under guardianship or curatorship,
• Persons deprived of liberty by judicial or administrative decision,
• Persons receiving psychiatric care under constraint,
• Persons under guardianship,
• Patient not affiliated with a social protection scheme

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Other
• Allocation: N/A
• Interventional Model: Single Group Assignment
• Masking: None (Open Label)

Number of Arms

1

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
Experimental: Patient consulting in spine surgery; Patient consulting in spine surgery who have undergone or will undergo an EOS X-ray as part of their care pathway (particularly as part of a pre-operative assessment for hip arthroplasty) :	Diagnostic test: Patient consulting in spine surgery; Self-administered questionnaire quality of life scales

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Correlation between Global Tilt and socio-psychological variables	The relationship between sagittal balance, assessed using EOS® imaging and measured by the angle known as Global Tilt (GT), and socio-psychological variables . Sagittal balance is normal if the Global Tilt angle is less than 23.2 degrees. When the Global Tilt angle is more than 33.7 degrees, it is considered that there is a moderate pathological imbalance of the sagittal balance	Baseline

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Correlation between sagittal balance and BBQ questionnaire	Correlation between other parameters of sagittal balance (T1-pelvic angle, T1 slope, LL, PT, SVA) and various psychological dimensions studied per the BBQ questionnaire BBQ : Back Belief Questionnaire : Relatively easy to implement (14 questions, ranging from 0 to 5) The Back and Belief Questionnaire (BBQ) is a standardized questionnaire with 14 items that allows for a score to be established on the extent of false beliefs held by subjects.	Baseline
Correlation between sagittal balance and SF-36	Correlation between other parameters of sagittal balance (T1-pelvic angle, T1 slope, LL, PT, SVA) and perceived health parameters (SF-36) SF-36v2® Health Survey : Benchmark score, validated by the scientific community. 36 items divided into 8 dimensions. Quick (less than 10 minutes).	Baseline
Relation between sagittal balance and demographic variables	Relation between other parameters of sagittal balance and measured demographic variables (age, sex, weight, size, diplomas, profession, ...)	Baseline
Correlation between sagittal balance and TSK questionnaire	Correlation between other parameters of sagittal balance (T1-pelvic angle, T1 slope, LL, PT, SVA) and various psychological dimensions studied per the TSK questionnaire TSK : Tampa Scale of Kinesiophobia : Validated for low back pain and in French. Relatively easy to implement (17 questions, the patient must respond by choosing a number between 1 (strongly disagree) and 4 (strongly agree). A score above 40 indicates a patient with significant kinesiophobia..	Baseline
Correlation between sagittal balance and PCS questionnaire	Correlation between other parameters of sagittal balance (T1-pelvic angle, T1 slope, LL, PT, SVA) and various psychological dimensions studied per the PCS questionnaire The Catastrophism Pain Catastrophising Scale (PCS) considers both catastrophizing thoughts and behaviors, described as a catastrophizing of pain. Validated in low back pain. Easy to implement (13 questions, with scores ranging from 0 to 4). Adapted into French using the PCS-CF. A score > 30 indicates a high level of catastrophizing.	Baseline
Correlation between sagittal balance and HADS questionnaire	Correlation between other parameters of sagittal balance (T1-pelvic angle, T1 slope, LL, PT, SVA) and various psychological dimensions studied per the HADS questionnaire Hospital Anxiety and Depression Scale (HADS) questionnaire is Easy to implement (14 questions, divided between questions on anxiety and depression). Good internal consistency in spinal pathology Validated in French A score ≥ 11 indicates the presence of anxiety or depressive symptoms.	Baseline
Correlation between sagittal balance and MSPQ questionnaire	Correlation between other parameters of sagittal balance (T1-pelvic angle, T1 slope, LL, PT, SVA) and various psychological dimensions studied per the MSPQ questionnaire Modified Somatic Perception Questionnaire (MSPQ) questionnaire is Easy to implement (13 questions, ranging from 0 to 3 points) Validated in spinal pathologies. The threshold has not been validated. We will use Balansyan's study as a guide, which determined that a score above 18 points appears appropriate for identifying somatic symptoms. This threshold has a sensitivity of 29% with very few false positives.	Baseline
Correlation between sagittal balance and Big Five Inventory questionnaire	Correlation between other parameters of sagittal balance (T1-pelvic angle, T1 slope, LL, PT, SVA) and various psychological dimensions studied per the Big Five Inventory questionnaire Big Five Inventory - 10-questions short form is Easy to implement (10 questions). Short form of the Big Five Inventory validated in French. Reproducible and validated tool. Describes patients according to 5 categories: Extraversion, Agreeableness, Conscientiousness, Neuroticism, and Openness. The score provides percentages for each category, indicating the patient's strengths and weaknesses.	Baseline

Collaborators and Investigators

• Sponsor: University Hospital, Bordeaux
• Investigators: Principal Investigator: Benjamin BOUYER, PROF, University Hospital, Bordeaux

Study record dates

Study Major Dates

• Study Start (Estimated): December 1, 2025
• Primary Completion (Estimated): June 1, 2026
• Study Completion (Estimated): June 1, 2026

Study Registration Dates

• First Submitted: October 14, 2024
• First Submitted That Met QC Criteria: June 8, 2025
• First Posted (Actual): June 17, 2025

Study Record Updates

• Last Update Posted (Actual): December 2, 2025
• Last Update Submitted That Met QC Criteria: December 1, 2025
• Last Verified: December 1, 2025

More Information

Terms related to this study

• Keywords: Sagittal Balance; Socio-Psychological Factors; Postural Alignment; EOS Radiography; Orthopaedic Surgery; Healthy Spine; Spinal Function; Psychological Dimensions; Spinal Radiographs
• Other Study ID Numbers: CHUBX 2023/59

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: No
• Studies a U.S. FDA-regulated device product: No
• product manufactured in and exported from the U.S.: No