I am an Australian Kinesiologist/sports therapist
The Cruciates, iliotibial band and patellar tendons are all part of connective tissue. The primary structural element of the body is connective tissue, specifically layers of fascia that envelop all muscles, organs, veins, arteries, and even the bones of the body, comprising a three dimensional network of tensional fibers.
For example, the tendon of a muscle is continuous with the fleece that surrounds the bone (periosteum) which it attaches to, and from there to the connective tissue of every other muscle, organ and bone in the body.
Next time you are at the butchers (the best place to view this, apart from the morgue) have a look at it.
This connective tissue network is very complex, not only enveloping every muscle organ and bone but ramifying within each muscle, organ and bone forming a supporting network all the way down to the cellular microscopic level and needs Vitamin C for proper function
If the connective tissue lacks this particular nutrient a whole range of issues will manifest. As this connective tissue looses its elasticity, tendons, which attach muscle bone, and ligaments, which attach bone to bone, will tighten, putting pressure on delicate joints, sometimes to the extent of losing synovial fluid which acts as the lubricant.
The skeletal system will be pulled out of alignment, and, as this involves ALL joints since they are interconnected, arthritis is the result. Usually the weakest part of the body reacts first to deficiencies, in your case the connective tissue involved in the knee.
I would recommend 2000 mg of vitamin C daily. More if possible. Spread out over the day and for at least 3 months or longer.
You did not mention which side the injury is located.
There is a difference, you know.
If this occurred on the right side leg it indicates a possible candida albicans or fungal problem like thrush.
The muscle that pulls you leg lateral (and i am only guessing because i don't know which leg is involved) is the Tensor fascia lata. It literally means 'Tightener fleece on the outside'.
I think yours is not doing its job very well.
This muscle works on the same energy as the large intestine, and is often involved in allergic reactions, usually dairy allergy, as the large intestine is the organ that is supposed to secrete lactase, the enzyme necessary for the digestion of milksugars called lactose.
After weaning the production of lactase ceases and this leads to dairy allergies.
An allergic reaction puts the affected organ into under energy which tightens up the muscles related to the organ, in your case the large intestine.
The other structural muscles related to the large intestine are the hamstrings and the quadratus lumborum. These three are important pelvic support muscles, and allergies make these muscles malfunction, leading to lower back problems because they pull the pelvis out of alignment.
Orthopedic surgery deals with the symptoms, but NOT THE CAUSE.
Massage the outside of the upper leg from center to the hip and knee, both directions at the same time, for 30 seconds at a time and about ten times a day Within a week this muscle will be fully functional again and leave your knee where it is supposed to be.
Avoid all dairy products and everything with dairy in it. If you are going to school as you say you are old enough to stop suckling.
Stay in touch! I like to know how you are getting on.
Good luck
Kinetico