Fig. 2From: Clinical outcome of arthroscopic internal drainage of popliteal cysts with or without cyst wall resectionSchematic cross-section of the knee. a A schematic view showing the positions of the arthroscopy via the anteromedial (AM) portal and the shaver via the posteromedial (PM) portal. b The arthroscopy and shaver were inserted to resect the capsular fold to reestablish normal bidirectional communication and expose the medial head of gastrocnemius (G) and the semimembranosus tendon (S). c This drawing shows the locations of the posteromedial (PM) viewing portal and the high posteromedial (HPM) working portal. d The cyst wall excision was completed through the high posteromedial (HPM) working portalBack to article page