The knee has various structures: collateral ligaments, cartilage (joint), meniscus and cruciate ligaments. If there is a knee lesion, more than one of these structures can be injured simultaneously.
The meniscus consists of two half-moon shaped fibro cartilage structures attached to the tibia. The external meniscus is also known as the lateral meniscus, the internal meniscus as the medial meniscus. Their function is to distribute weight when we walk or run, contributing to knee stability. If they didn’t exist, the joint cartilage would have to support too heavy a load and would be damaged.