ligaments.]]> femur bones, the two bones on the front of the leg.]]> tibia and femur bones, the two bones on the front of the leg.]]> arthritis in their knee than those who never had one.]]> injuries to one of the knee's four major connective tissues, or ligaments.]]> arising from all of these sports, along with cheerleading and dance.]]> tissue runs diagonally across the knees.]]> hormones also make the ligaments looser.]]> intensely all year, with few breaks.]]> crutches to try to stay off it, Schultz says.]]>