All the patients who meet the inclusion criteria and giving written informed consent will be randomized. We planned to enrol 120 patients.~Following the randomization, every patient will be treated with a single injection of Bone Marrow Aspirate Concentrate (BMAC) or two injections of Hyaluronic Acid (HA) in the affected ankle.~After the treatment patients will be followed up to 24 months whit clinical and radiological assessment.~After 12 months patients in the control group can decide to cross-over in the treatment group with BMAC. These patients will be followed up further 12 months.
The aim of the study is to compare the efficacy of the infiltrative therapy of BMAC vs HA up to 24 months in the treatment of the ankle osteoarthritis. The efficacy will be assessed through clinical, objective and subjective evaluations. After 12 months patients in the control group can decide to cross-over in the treatment group.