Assessing the Socio-Psychological Determinants of Sagittal Balance

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