Flashcards in Hip FUNCTION focus Deck (45):
Passive tension in which muscle(s) limits ABduction?
the 2-joint gracilis
Passive tension in which muscle(s) limits ADduction?
TFL and ITB
Passive tension in which muscle(s) limits hip flexion when combined with knee extension?
the 2-joint rectus femoris
Motion of the hip joint is produced by movement of the pelvis on the
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.
What occurs with a posterior pelvic tilt in the sagittal plane?
pubic symphesis rises, sacrum descends
What occurs with an anterior pelvic tilt in the sagittal plane?
ASIS moves inferiorly on fixed femur
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
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
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.
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
With L unilateral stance, how does forward rotation manifest?
L hip is axis of rotation, R hip rotates forward, medial rotation at left hip
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)
What combination of movements increases ROM in forward flexion to reach the hands to the floor? Is this mostly open or closed chain?
combination of hip flexion, anterior pelvic tilt, flexion of lumbar spine maximizes ROM
R sidelying position, lift your left leg into abduction? What else happens and is this open-or closed chain?
combination of L hip abduction (OPEN-chain)
lateral pelvic tilt (left hike about the right hip) and lumbar flexion to the left (closed chain)
What is pelvifemoral motion?
combination of hip, pelvic, and lumbar motion
Anterior pelvic tilt is accompanied by what hip joint motion and what compensatory lumbar spine motion?
Posterior pelvic tilt is accompanied by what hip joint motion and what compensatory lumbar spine motion?
Lateral pelvic tilt (R drop) is accompanied by what hip joint motion and what compensatory lumbar spine motion?
L lateral lumbar flexion
Lateral pelvic tilt (R hike) is accompanied by what hip joint motion and what compensatory lumbar spine motion?
R lateral lumbar flexion
Forward rotation (about R axis) is accompanied by what hip joint motion and what compensatory lumbar spine motion?
R medial rotation
L lumbar rotation
Backward rotation (about R axis) is accompanied by what hip joint motion and what compensatory lumbar spine motion?
R lateral rotation
R lumbar rotation
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
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
Adductors act as hip ________ in neutral hip position and as hip _____ from flexed hip position.
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
The rectus femoris is most involved in hip flexion when the knee is _______.
(hip flex + knee ext puts rectus femoris into active insufficiency)
What relieves tensile stress imposed on the femoral shaft with WB?
What is the most important fxn of the TFL?
maintains tension in ITB (with help of glut med)
Excessive tension in the ITB is observed in which position?
Think Ober test. Hip extension and adduction is limited by ITB.
The gracilis acts as a hip flexor when the knee is in which position?
extended knee only
The abductors are most effective in what position?
slightly adducted position
In unilateral stance, which two muscles are most important pelvic stabilizers for superimposed HAT segment?
glut min and glut med
The lateral rotators insert on or near the
The common tendon is a shared insertion of which lateral rotators?
gemellus superior, gamellus inferior, quadratus femoris
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!
No specific medial rotators of the hip. Rather the adductor muscles and what other muscles contribute?
anterior glut med, glut min ,TFL
Medial rotations trends with what hip position?
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
Subscapularis is responsible for shoulder IR. What muscles are analogues in the hip?
anterior glut med and min
Supraspinatus is responsible for shoulder ABduction. What muscles are analogues in the hip?
In bilateral stance with both LEs bearing equal weight, what controls frontal plane motion of the pelvis?
contralateral ABductors/ADductors fxn as synergists
Hip joint stability in unilateral stance limb is sole domain of which muscle(s)?
(adduction does NOT contribute to stability of the stance limb)
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