The lateral patellar retinaculum, or canal, in the patella, allows muscle and tissue to pass through from the femur (thigh bone). The patellar ligament is the center of the common tendon, which continues from the patella (knee cap) to the tibia. It is a very strong, flat band, the fibers of which are continuous over the front of the patella with tendons that extend and pass down the sides of the patella Continue Scrolling To Read More Below...