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Arthroscopy being performed on a patient's right knee. Demonstrating anterior and posterior bone tunnel creation. (A) Posterior tunnel drilling: the tibial guide is set to 50° and inserted through the anterolateral portal; the arthroscope is positioned in the anteromedial portal. (B) Anterior tunnel drilling: the tibial guide is set to 70° and inserted through the anteromedial portal; the arthroscope is positioned in the anterolateral portal.
