Hip Myology (2)

Question 1

What are the primary muscles involved with motions of the hip?

Answer 1

Illiopsoas

Rectus femoris

TFL

Sartorius

Question 2

What are the secondary muscles involved with motions of the hip?

Answer 2

Pectineus

Adductor brevis

Adductor longus

Adductor magnus (oblique fibers)

Gracilis

Question 3

What is the innervation of the rectus femoris, Sartorius, and Iliopsoas?

Answer 3

Femoral nerve

Question 4

What is the innervation of the TFL?

Answer 4

Superior gluteal nerve

Question 5

What are some diagnoses with a tight ITB?

Answer 5

Snapping hip syndrome

Inflammation of trochanteric bursa

Question 6

What does a tight ITB cause?

Answer 6

Reduced hip adduction with hip extended

Question 7

What muscle is affected with external rotation of the tibia?

Answer 7

Biceps femoris

Question 8

What muscle is affected with internal rotation of tibia?

Answer 8

Semimembrinosous

Semitendinosous

Question 9

What are the functions of the hip abductor muscles in open kinetic chain?

Answer 9

Hip abduction

Hip internal rotation and flexion (anterior fibers)

Hip external rotation (posterior fibers)

In flexion all fibers internally rotate the hip

Question 10

What is the function of hip abductor muscles in closed kinetic chain?

Answer 10

Stabilizes the pelvis in unilateral stance

Question 11

What does ER action lines lying perpendicular to femoral shaft equal?

Answer 11

Excellent ERs

Question 12

What does ER action lines lying parallel to head and neck of the femur equal?

Answer 12

Excellent compressors

Question 13

What are runners with LE injuries associated with?

Answer 13

Hip abduction and flexor weakness

Question 14

What is the internal rotation torque with flexed vs extended?

Answer 14

3x more internal rotation torque when hip is flexed