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Cyclops lesion

A cyclops lesion is a complication of anterior cruciate ligament surgery, where the new replacement ligament slowly strips away and bundles into a knot, jamming up the 'intercondylar notch' and preventing the knee from fully straightening. The lump sometimes looks like the central eye of a mythical 'cyclops' monster, hence the name.

The term has been extended to include a similar obstruction of the notch by the damaged ligament itself, rather than from the reconstructed ligament.