Inclusion Criteria:  Patients aged 18 years or older Trigger Finger (clinically defined by painful difficulty or protrusion when extending the finger) with an ultrasound-guided infiltration of cortisone derivatives indication. Written consent Affiliation to a Social Security system Prior medical examination  Exclusion Criteria:  Neurological conditions affecting the hand other than carpal tunnel syndrome Intra-articular infiltration of the hand or the wrist ≤ 2 months Allergy to Xylocaine Contraindication to Xylocaine or cortisone derivatives Cognitive or behavioral disorders that make assessment impossible Persons referred to in articles L 1121-5; 6; 8; 9 of the Public Health Code (protected adults, under guardianship or curatorship, etc) Pregnancy and breastfeeding; absence of contraceptive method for women of childbearing age Participant unable to speak, read and write French