SPECT/CT Bone Scan Quantification Surgery

Inclusion Criteria: * Persons with back pain for at least 3 months (presumed to be due to degenerative disc disease or spondylolisthesis). * Persons who have received full information about the organisation of the research and have signed the informed consent and : * Age ≥ 18 years, having read and understood the information document. * Affiliated to a social security scheme. * Lumbar arthrodesis involving a maximum of 2 floors. * Standardized lumbar arthrodesis surgery performed by one of the three senior neurosurgeons of the neurosurgery department of the Nancy CHRU, using similar surgical techniques. Exclusion Criteria: * Low back pain of neuropathic origin. The Neuropathic Pain Scale 4 questionnaire is used to diagnose neuropathic pain (score is ≥ 4/10) * History of lumbar spine surgery * Presence of other pathologies responsible for lumbar pain (multistage discopathies, ankylosing spondylitis, spondylodiscitis, rheumatoid arthritis, vertebral compression, vertebral metastasis, narrow lumbar canal, scoliosis, spondylolisthesis by isthmic lysis) * Pregnant women or women of childbearing age without suitable contraception or nursing mothers. * Unstable medical condition and/or inability to remain immobile in supine position during recordings. * Known allergy to any component of the radiopharmaceutical (TECHNESCAN HDP). * Person referred to in Articles L. 1121-5, L. 1121-7 and L1121-8 of the Public Health Code. * Persons deprived of their liberty by a judicial or administrative decision, persons under psychiatric care by virtue of Articles L. 3212-1 and L. 3213-1. * Persons of full age who are unable to express their opposition.