Mesenchymal Stromal Cells for Degenerative Meniscus Injury

Inclusion Criteria: * Patient between 40 and 60 years of age * Degenerative meniscus injury grade 3 (Crues et al.) * Indication of conservative treatment * Normal alignment of the knee (between 3º varus and 10 º valgus) * Patient is able to follow a rehabilitation program * Informed consent given by the patient in writing * Patient is able to understand the trial. Exclusion Criteria: * Traumatic meniscus injury * Surgical intervention to the affected knee * Local or systemic infection * Intraarticular treatment of the affected knee with steroids or hyaluronic acid within the past 3 months * Significant abnormal laboratory tests that contraindicates participation in the trial. * Pregnant women or intend to become pregnant or breast-feeding * Neoplastic process within the previous 5 years or without complete remission. * The patient is wearing a pacemaker, allergy to contrast, severe renal insufficiency or any other condition that contraindicates the magnetic resonance using contrast. * Other pathologic conditions or circumstances that difficult participation in the study according to medical criteria * Legally dependant patient. * The patient does not accept to be followed-up for a period that could exceed the clinical trial length