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(A) Right knee, seen from an anterolateral perspective. The inflow and outflow systems are created. P denotes the distal part of the patella, number 1 the lateral inferior portal (i.e., the primary inflow portal), 2 the superolateral portal (i.e. the primary outflow portal), 3 the inflow cannula, 4 the needle arthroscopy camera, 5 the outflow cannula, and 6 the sterile basket placed under the outflow portal. (B) Intra-articular needle arthroscopic view of the right knee.
