therapeutic composition for regenerative treatment of diseases of cartilage

A composition for regenerative treatment of cartilage disease, which comprises a PDE4 inhibitor as an active ingredient, specifically a composition comprising a PDE4 inhibitor and a biocompatible and biodegradable polymer is provided, which composition, when formulated into a form suited to administer locally to affected cartilage region, such as microsphere preparation, can provide a pharmaceutical composition showing an excellent effect in regenerative treatment of cartilage.