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Arthroscopic image of the knee joints. (a) arthroscopic image showing hard scar-like tissue in the joint capsule of the right knee (red arrows). (b) Arthroscopic image showing hard scar-like tissue in the joint capsule of the left knee (red arrows). (c) The scar-like tissue in the right lateral patellofemoral joint was resected by arthroscopic surgery. (d) The scar-like tissue in the left lateral patellofemoral joint was resected by arthroscopic surgery.
