Kines: Kinematics Of Hip

Front 1

explain the motion that occurs during pelvic-on-femoral hip motions

Back 1

the pelvis is rotating, usually the trunk is superimposed over a fixed femur

Front 2

what is important to note re: the axis of rotation and the femur

Back 2

most of the longitudinal axis lies outside of the femur because there is anterior bowing of the femoral shaft and angle of the proximal femur

Front 3

what is the range of hip flexion that we have

Back 3

if the knee is fully flexed, the hip flexes to 120

if the knee is extended, the hip flexes to 80

Front 4

what are the results of full hip flexion

Back 4

1) slackens ligaments
2) stretches inferior capsule

Front 5

what is the range of hip extension taht we have

Back 5

if knee extended, 20 degres beyond neutral

if knee fully flexes, passive tension in stretched rectus limits hip flexion to neutal

Front 6

what are the results of full hip extension

Back 6

increases passive tension in most capsular connective tissues... especually iliofemoral ligament and hip flexor muscles

Front 7

what is the range of motion that we have for hip abduction

Back 7

40 degrees

Front 8

what is the range of motion that we have for hip adduction

Back 8

25 degrees (note is limited by interference with contralateral limb)

Front 9

what is the range of motion we have for hip internal rotation

Back 9

35 degrees..... in normal adults this range should not change whether the hip is flexed or extended

Front 10

what is the range of external rotation we have

Back 10

if hip is extended, 45 degrees

Front 11

what does lumbopelvic rhythm describe

Back 11

since the SI joint attaches the caudal axial skeleton to the pelvis..... rotation of the pelvis over the femoral head changes configuration of the lumbat spine

Front 12

what is ipsi-directional lumbopelvic rhythm

Back 12

pelvis and lumbar spine rotate in teh same direction

Front 13

what is contra-directional lumbopelvic rhythm

Back 13

pelvis rotates in one direction while lumbar spine rotates in opposite direction

- supra-lumbar trunk can stay stationary as the pelvis rotates

Front 14

what "directional" lumbopelvic rhythm maximizes displacement of the turnk over the LE

Back 14

ipsi-directional lumbopelvic rhythm

Front 15

examples of contra-directional lumbopelvic rhythm and examples oc ipsi-directional lumbopelvic rhythm

Back 15

contra-directional: walking, dancing, anything where eyes and head need to be held fixed in space independent of pelvic rhythm

ipsi-directional: extending reaching capacity of UE

Front 16

what does it mean that the lumbar spine acts as a "de-coupler"

Back 16

lumbar spine allows the pelvic and supralumbar trunk to move independently

Front 17

what is the limitation that a person with a lumbar fusion will have

Back 17

cannot rotate the pelvis without rotating the entire supralumbar spine, therfore cannot move pelvis and maintain eye-level

Front 18

what is the lane of motion and axis for pelvic tilts

Back 18

sagital plane rotation of pelvis relative to the femur

M-L axis of rotation passing through both femoral heads

Front 19

if you are sitting with 90 degrees of hip flexion, what is the pelvic on femoral implication

Back 19

ther should be additional 30 degrees of pelvic on femoral flexion (anterior pelvic tilt) --- limited by completely extended lumbar spine

Front 20

explain the pelvic on femoral rotation in the femorla plane

Back 20

abduction of the supported hip shows a "hike" on the contralateral side

adduction of the support hip would show lowering of the iliac crest on the contralateral side

Front 21

during pelvic on femoral adduction, what happens to the lumbar spine

Back 21

there is a lateral concavity on the side of the adducted hip (assuming supralumbar trunk remains stationary)

Front 22

during pelvic on femoral abduction what happens to the lumbar spine

Back 22

there is a lateral convexity towards the abducting hip (assuming supralumbar trunk remains stationary)

Front 23

how much abduction do we have for pelvic on femoral motion

Back 23

only 30 degrees due to the limits of lateral bending in the lumbar spine

Front 24

what could cause a restricted pelvic on femoral ROM

Back 24

normal is 30, <30 would be due to tight adductors or restruction in the pubofemoral ligament

Front 25

how would a patient present if they had an adductor contracture

Back 25

iliac crest on side of nonsupport hip = lower than iliac crest of support hip

Front 26

what could cause limited pelvic on femoral adduction

Back 26

1) hypomobile lumbar spine
2) marked decreased length within iliotibial band
3) hip abductor muscle shortness/tightness

Front 27

what is the axis of rotation for pelvic on femoral rotation in the horizontal plane

Back 27

longitudinal axis

Front 28

describe the motion that occurs with pelvic on femoral internal rotation

Back 28

iliac crest on the side of the non-support hip rotates FORWARD in the horizontal plane

Front 29

describe the motion that occurs with pelvic on femoral external rotation

Back 29

iliac crest on side of nonsupport hip rotates BACKWARD in horizontal plane

Front 30

If the pelvis is rotating beneath stationary trunk, what happens to the lumbar spine

Back 30

lumbar rotates in the opposite direction, so axial rotation available at the lumbar spine limits full rotation of the support hip