Hello
You can try HGH & testosterone injections for strengthening your quadriceps muscle or tendon. There are also some side effects with hormone injections.
There is also PRP injection procedures available called plasma rich platelets therapy.
You have to discuss this with an expert orthopedician who practices these techniques in your area before trying them out.
Proper history, age of your injury and the amount of damage of quadriceps tendon/muscle is important.
Take care!
Are you talking about human growth hormone, i had a body builder friend who used that for pretty much the exact same thing- the HGH changed everything the shape of his head-jaw, i dont know if he ever did solve the problem- but boy did it change the way he looked- i would definitely see a doc- is that even a recognized form of therapy for your injury. good luck- maybe your head wont grow..but i would be checking on that.