The Knee Learning Resource
Meniscal cysts are little bags of joint fluid under pressure, usually appearing as a tender lump along the joint line.
They are usually associated with a horizontal cleavage tear of the meniscus - where the meniscus is torn horizontally - like a mouth - and fluid gets trapped between the lips with each step, forcing the tear to propogate and eventually forcing the fluid right out the other side of the meniscus into the joint line, where it can go no further as it is constrained by the capsule around the knee.
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