Bone marrow lesions (BMLs) of the knee are common subchondral defects, often associated with pain and functional limitation. Subchondroplasty is a percutaneous procedure in which calcium phosphate is injected inside BML areas, ensuring stability and promoting the deposition of new bone. Primary outcome of this study was to obtain a reduction of the Numeric Rating Scale score of 4 points or more at 6 months follow-up in more than 75% of patients. The secondary outcome was to evaluate the osteoarthritic and bone marrow structure evolution in the months after the procedure.

Inclusion Criteria:

• Atraumatic knee pain for at least 3 months;
• Failure of conservative treatment (including NSAIDs, physical therapy, intra- articular injection with steroids or hyaluronic acid and bisphosphonates);
• Mild to moderate osteoarthritis (Kellgren-Lawrence18 grade ≤ 3)
• BML on a loading area at MRI imaging (femoral condyles and/or tibial plateau)

Exclusion Criteria:

• Knee pain and functional limitation related to other causes like osteonecrosis
• Fractures or inflammatory arthritis
• Ligamentous instabilities
• Malalignment on the coronal axis greater than 10 degrees in varus/valgus
• Severe tri-compartmental arthritis (Kellgren-Lawrence grade 4)

Researcher will not share data with other organizations