What is partial thickness cartilage loss involving the infrerior lateral trochlea?

I can't answer exactly, but can tell you that by breaking it down as learned in medical terminology... partial, is obviously "a part of" cartilage, is the type of "cushioning" that our joints have in order for them not to be bone-on-bone when we move. inferior, means below (opposite of superior) lateral, means toward the outside (opposide of medial, which menas toward the midline of the body) and trochlea is part of the hip joint, where the ball and socket joint's main bone is called the "greater trochanter". This is at the very top of your femur, which is the largest bone in your body and is known by most as your "thigh bone". I hope this helps you understand some of what you were asking. I have always loved medical terminology and tutored it for a few years. In "my" terms, I guess I would say that the answer in layman's terms is a loss of part of the cushioning in the outside area of the hip joint. But, someone else may know how to explain it better!