Prone position for minimal invasive or all-arthroscopic autologous chondrocyte implantation at the patella.

Full size retropatellar cartilage lesions are troublesome conditions to treat and an autologous chondrocyte implantation with or without matrix or scaffold in supine position is difficult. Usually, it is necessary to perform a large arthrotomy to evert the patella in order to get sufficient access to the retropatellar cartilage defect. The procedure is associated with a significant parapatellar soft tissue trauma to the patient. This technical note introcudes a minimal invasive approach with the patient in prone position using an all-arthroscopic or mini-open technique to treat retropatellar full size articular cartilage lesions of the patella.