The identification of the operative site of lumbar ductal stenosis and lumbar disc herniation is classically done by radioscopy, thus inducing irradiation of the patient.

The use of ultrasound in spine surgery is little studied and poorly mentioned in the scientific literature. However, it is commonly used for other types of scouting (especially anesthetics). Thus, in the absence of consensus and clear recommendations, some practitioners perform ultrasound scans . Methodological developments also validate the feasibility of the ultrasound approach.

The double benefit of an ultrasound identification is firstly a lack of exposure to X-rays for both the patient and the operating team and secondly a lower cost than a conventional radiography.

The main objective is to demonstrate the interest of the ultrasound identification of the surgical site in the intervention of lumbar ductal stenosis and lumbar disc herniations in terms of concordance of the operating site between ultrasound and fluoroscopy.

Inclusion Criteria:

• Major patients
• Patients who gave their consent
• Patients requiring surgery for the treatment of lumbar stenosis or lumbar disc herniation

Exclusion Criteria:

• Pregnant or lactating women according to article L1121-5 of the CSP.
• Vulnerable persons according to article L1121-6 of the CSP.
• Major persons placed under guardianship or curatorship