Meniscal cysts begin with extrusion of synovial fluid through a tear of the meniscus, enlarging probably as a result of a one-way valve effect of the tear flap. We describe a technique of arthroscopic internal marsupialization of meniscal cysts with or without meniscectomy. A 5 mm channel was created in the capsule adjacent to the cyst arthroscopically for decompression of the cyst into the joint, thus equalising pressures between the cystic and intra-articular compartments. Only unstable meniscal tears were debrided down to a stable rim while intact meniscii or stable tears were left alone. Eight patients with MRI confirmed atraumatic medial or lateral meniscal cysts underwent surgery. At a mean follow-up of 39.1 months (12-94 months, S.D. 26.4), Tegner scores averaged 5.1 (3-8, S.D. 2.1) and Lysholm scores averaged 94.4 (85-100, S.D. 5.4). No cyst recurred. Arthroscopic internal marsupialization effectively decompresses meniscal cysts and prevents their recurrence, while preserving meniscal tissue and minimising arthrosis of the knee joint.
Arthroscopic internal marsupialization of meniscal cysts. Publishing Authors By Initials
