Fig. 3From: Comparison of arthroscopic internal drainage and open excision for the treatment of popliteal cystsa Arthroscopic view of capsular in the posteromedial wall, the red arrow to the “one-way valve”; b Resection of the capsular folds to reestablish the two-way communication between articular cavity and the cyst; c The entire picture and internal condition of the cyst observed under arthroscopyBack to article page