ISO-C-3D based computer assisted surgery (CAS) guided retrograde drilling in a osteochondritis dissecans of the talus: A case report

The goal in osteochondral defects of the talus in stages I and II according to Berndt and Harty is revascularisation of the lesion. Subchondral drillings of the lesion allow a revascularisation. Retrograde drillings leave the chondral surface intact and is, therefore, advantageous compared with antegrade drillings. Therefore, this technique is especially favourable when the remaining cartilage is of good quality. Arthroscopically guided drilling is limited to those lesions that could be arthroscopically identified. In addition to the current method of arthroscopic evaluation and treatment, we also commenced an alternative technique of using intraoperative three-dimensional imaging (ISO-C-3D) based computer assisted surgery (CAS) guided retrograde drilling of the lesion.