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Functional Anatomy > Hip FUNCTION focus > Flashcards

Hip FUNCTION focus Flashcards

1
Q

Passive tension in which muscle(s) limits ABduction?

A

the 2-joint gracilis

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2
Q

Passive tension in which muscle(s) limits ADduction?

A

TFL and ITB

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3
Q

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

A

the 2-joint rectus femoris

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4
Q

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

A

femur.

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5
Q

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?

A

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

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6
Q

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

A

pubic symphesis rises, sacrum descends

hip extension

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7
Q

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

A

ASIS moves inferiorly on fixed femur

hip flexion

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8
Q

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

A

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

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9
Q

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

A

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

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10
Q

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

A

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

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11
Q

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

A

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

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12
Q

With L unilateral stance, how does forward rotation manifest?

A

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

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13
Q

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

A

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

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14
Q

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

A

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

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15
Q

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

A

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)

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16
Q

What is pelvifemoral motion?

A

combination of hip, pelvic, and lumbar motion

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17
Q

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

A

hip flexion

lumbar extension

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18
Q

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

A

hip extension

lumbar flexion

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19
Q

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

A

R aBduction

L lateral lumbar flexion

20
Q

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

A

R aDDuction

R lateral lumbar flexion

21
Q

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

A

R medial rotation

L lumbar rotation

22
Q

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

A

R lateral rotation

R lumbar rotation

23
Q

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

A

forward head and trunk segment

LOG falls outside of BOS

24
Q

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

A 
lumbar extension (increased lordosis)
returns head over the sacrum so LOG is in BOS
25
Q

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

A

flexors

extensors

26
Q

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

A

anterior pelvic tilt

forward pull of lumbar vertebrae into flexion

27
Q

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

A

flexed

hip flex + knee ext puts rectus femoris into active insufficiency

28
Q

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

A

ITB

29
Q

What is the most important fxn of the TFL?

A

maintains tension in ITB (with help of glut med)

30
Q

Excessive tension in the ITB is observed in which position?

A

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

31
Q

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

A

extended knee only

32
Q

The abductors are most effective in what position?

A

slightly adducted position

33
Q

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

A

glut min and glut med

34
Q

The lateral rotators insert on or near the

A

greater trochanter

35
Q

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

A

gemellus superior, gamellus inferior, quadratus femoris

36
Q

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

A

perpendicular to femoral shaft –> rotation!

parallel to neck/head –> compression!

37
Q

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

A

anterior glut med, glut min ,TFL

38
Q

Medial rotations trends with what hip position?

A

hip flexion

39
Q

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

A

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

40
Q

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

A

anterior glut med and min

41
Q

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

A

glut med

42
Q

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

A

contralateral ABductors/ADductors fxn as synergists

43
Q

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

A 
hip ABductors
(adduction does NOT contribute to stability of the stance limb)
44
Q

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

A

BW increases hip compression to WB leg

aDduction torque causes equal and opposite aBductor muscle compression

45
Q

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

A

~3 times BW

Functional Anatomy (13 decks)

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