The muscle group of your front thigh is the quadriceps group, and its tendons attach to your kneecap and tibia. Hamstring tendons attach the back thigh muscles to your tibia. Calf muscles tendons connect to the tibia, and femur. There is also a band at the outside of your knee. Tendon Injuries Tendinitis is a common overuse injury.
Overwork causes inflammation.
Tendon pain is usually worse when you get out of bed, and slowly eases off with use. Resist using this to persuade yourself you can exercise as usual. Tendinitis can be persistent because tendons don't have such a good blood supply as muscles. Since it's usually caused by overuse, the most important part of the treatment is rest. This may not mean inactivity, but it certainly means a reduced workload.