Inclusion Criteria:  Patient whose age ≥ 18 years French speaking patient Patient hospitalized in the rheumatology department of GHPSJ between 01/01/2014 and 31/12/2020 for MODIC 1 Patients who received as part of their management an intra-disc infiltration with hydrocortancyl.  Exclusion Criteria:  Patient under guardianship or curators Patient deprived of liberty Patient under court protection Patient objecting to the use of his data for this research Patient having benefited from another infiltration between the intradiscal infiltration and the collection of efficacy data at 3 months.