The sheet describes a conservative surgical procedure on a male patient suffering from knee arthrosis. A treatment that included a tibial opening wedge osteotomy was opted for, with the interposition of an Osteoplant wedge perfused with autologous whole bone marrow. Fourteen months after the procedure, the X-rays showed complete osseointegration of the graft and its possible remodeling, evidenced by a change in its radiopacity which had, at first, been slightly higher than that of the surrounding bone tissue and now appeared completely the same. The plate was then removed. Currently, the patient performs moderate physical activity without limitations and has no significant symptoms.