Vastus Intermedius Muscle: Quadriceps Thigh and Knee Pain
The vastus intermedius muscle can cause and contribute pain down the front of the thigh and knees. Pain increases when walking up an incline or stairs.
Chondromalacia Patellae
Rectus Femoris Muscle: Thigh, Knee Pain
The rectus femoris muscle contributes to knee and thigh pain. It also contributes to restless leg syndrome and “knee bugs”.