'thigh muscle' is correct and usable in written English.
You might use it, for example, in a sentence like: "When I was recovering from my knee injury, I did a lot of exercises to strengthen my thigh muscle."
He has a three-centimeter tear in his thigh muscle.
I just, in Fed Cup, I tore my thigh muscle.
"Contract your thigh muscle, please," Dr. José Morais said.
He looked old, faring poorly against the Colts while reportedly playing with a torn thigh muscle.
Campy had a damaged thigh muscle and Rube Walker filled in for him.
He crumpled to the ground, his sore thigh muscle aggravated, and Timo Perez pinch ran.
Against Bailey in 1997, he injured the thigh muscle in his left leg.
She is all cheekbones and plump lips; high, round bottom and long, lean thigh muscle.
The drip loss in thigh muscle decreased linearly (P=0.003) as the supplemented XOS increased.
Inter- and intrarater reliability of isokinetic thigh muscle strength tests in postmenopausal women with osteopenia.
Thigh muscle cross sectional area and adiposity were assessed by computed tomography.
