Motivated by a desire to explain variations in patients' recovering from knee surgery and even variations in recovery from the same patient where both knees were replaced, in the Fall of 2013, knee surgeons of the University Hospital in Belgium thought they had discovered a new knee ligament. Their discovery was backed up by relevant science. They called it A.L.L. (Anterolateral ligament). However, further research of the history calls their discovery, though well intentioned, into question. It casts doubt upon their claim. The ligament they thought they discovered has been called by other names at other times. Scientific knowledge about the human knee is still being expanded. There is work yet to be done. Fortunately for patients that work is being done.