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Flashcards in Hip FUNCTION focus Deck (45):
1

Passive tension in which muscle(s) limits ABduction?

the 2-joint gracilis

2

Passive tension in which muscle(s) limits ADduction?

TFL and ITB

3

Passive tension in which muscle(s) limits hip flexion when combined with knee extension?

the 2-joint rectus femoris

4

Motion of the hip joint is produced by movement of the pelvis on the

femur.

5

Anterior and posterior tilting of the pelvis will result in flexion and extension of both hip joints simultaneously in bilateral stance. What about single leg stance?

can also occur at stance hip joint alone when opposite leg is NWB.

6

What occurs with a posterior pelvic tilt in the sagittal plane?

pubic symphesis rises, sacrum descends
hip extension

7

What occurs with an anterior pelvic tilt in the sagittal plane?

ASIS moves inferiorly on fixed femur
hip flexion

8

Stand on left leg. Drop pelvis. What happens at the hip joint?

L hip adduction
(medial angle b/w femur and line through ASIS decreases)
R hip abduction

9

Stand on left leg. Hike pelvis. What happens at hip joint?

L hip abduction
(medial angle b/w femur and line through ASIS increases)
R hip adduction

10

Lateral pelvic tilt is named by what is happening to which side? Which side it the axis of rotation?

the side opposite to the WB hip in unilateral stance is the tilting side. The WB hip joint is always the axis of rotation.

11

In bilateral stance (closed-chain), how does lateral pelvic tilt manifest and what happens at each hip joint?

results in lateral shift of pelvis
so if R lateral pelvic shift, R femur is adducted
L hip drops, L femur abducted

12

With L unilateral stance, how does forward rotation manifest?

L hip is axis of rotation, R hip rotates forward, medial rotation at left hip

13

Is forward/backward pelvic rotation possible in closed-chain bilateral stance?

Yes. The center of rotation is vertical axis through center of pelvis. (R forward/L backward)

14

What combination of movements increases ROM in forward flexion to reach the hands to the floor? Is this mostly open or closed chain?

PELVIFEMORAL MOTION
combination of hip flexion, anterior pelvic tilt, flexion of lumbar spine maximizes ROM
OPEN chain

15

R sidelying position, lift your left leg into abduction? What else happens and is this open-or closed chain?

PELVIFEMORAL MOTION
combination of L hip abduction (OPEN-chain)
lateral pelvic tilt (left hike about the right hip) and lumbar flexion to the left (closed chain)

16

What is pelvifemoral motion?

combination of hip, pelvic, and lumbar motion

17

Anterior pelvic tilt is accompanied by what hip joint motion and what compensatory lumbar spine motion?

hip flexion
lumbar extension

18

Posterior pelvic tilt is accompanied by what hip joint motion and what compensatory lumbar spine motion?

hip extension
lumbar flexion

19

Lateral pelvic tilt (R drop) is accompanied by what hip joint motion and what compensatory lumbar spine motion?

R aBduction
L lateral lumbar flexion

20

Lateral pelvic tilt (R hike) is accompanied by what hip joint motion and what compensatory lumbar spine motion?

R aDDuction
R lateral lumbar flexion

21

Forward rotation (about R axis) is accompanied by what hip joint motion and what compensatory lumbar spine motion?

R medial rotation
L lumbar rotation

22

Backward rotation (about R axis) is accompanied by what hip joint motion and what compensatory lumbar spine motion?

R lateral rotation
R lumbar rotation

23

What is an open-chain response to tight hip flexors? How does this change LOG?

forward head and trunk segment
LOG falls outside of BOS

24

What is an fxnal closed-chain response to tight hip flexors? How does this change LOG?

lumbar extension (increased lordosis)
returns head over the sacrum so LOG is in BOS

25

Adductors act as hip ________ in neutral hip position and as hip _____ from flexed hip position.

flexors
extensors

26

Most important hip flexor is iliopsoas. Activity or passive tension results in ______ pelvic tilt and pulling of lumbar vertebrae ________.

anterior pelvic tilt
forward pull of lumbar vertebrae into flexion

27

The rectus femoris is most involved in hip flexion when the knee is _______.

flexed
(hip flex + knee ext puts rectus femoris into active insufficiency)

28

What relieves tensile stress imposed on the femoral shaft with WB?

ITB

29

What is the most important fxn of the TFL?

maintains tension in ITB (with help of glut med)

30

Excessive tension in the ITB is observed in which position?

Think Ober test. Hip extension and adduction is limited by ITB.

31

The gracilis acts as a hip flexor when the knee is in which position?

extended knee only

32

The abductors are most effective in what position?

slightly adducted position

33

In unilateral stance, which two muscles are most important pelvic stabilizers for superimposed HAT segment?

glut min and glut med

34

The lateral rotators insert on or near the

greater trochanter

35

The common tendon is a shared insertion of which lateral rotators?

gemellus superior, gamellus inferior, quadratus femoris

36

The lines of action of the lateral rotators are _____ to the femoral shaft and _____ to the head and neck of the femur.

perpendicular to femoral shaft --> rotation!
parallel to neck/head --> compression!

37

No specific medial rotators of the hip. Rather the adductor muscles and what other muscles contribute?

anterior glut med, glut min ,TFL

38

Medial rotations trends with what hip position?

hip flexion

39

The ITS of the rotator cuff are responsible for shoulder ER. What muscles are analogues in the hip?

piriformis, obturator internus and externus, inferior and superior gamelli, posterior glut med

40

Subscapularis is responsible for shoulder IR. What muscles are analogues in the hip?

anterior glut med and min

41

Supraspinatus is responsible for shoulder ABduction. What muscles are analogues in the hip?

glut med

42

In bilateral stance with both LEs bearing equal weight, what controls frontal plane motion of the pelvis?

contralateral ABductors/ADductors fxn as synergists

43

Hip joint stability in unilateral stance limb is sole domain of which muscle(s)?

hip ABductors
(adduction does NOT contribute to stability of the stance limb)

44

In unilateral stance, what are the components of the joint reaction force?

BW increases hip compression to WB leg
aDduction torque causes equal and opposite aBductor muscle compression

45

What is the estimated value for joint reaction force (joint compression) at the hip in unilateral stance?

~3 times BW