hip anatomy and biomech

Question 1

what are the articulating structures that make up the hip joint

Answer 1

acteabulum and femoral head

Question 2

how is the femoral head oriented?

Answer 2

faces superiorly, anteriorly and medially

Question 3

what is the angle of inclination of the FH

Answer 3

125 degrees

Question 4

what is the angle of torsion of the FH

Answer 4

the anhle b/w the axis of the femorl neck and the transcondylar axis
~8-15 degrees

Question 5

when does anteversion of the FH occur?

Answer 5

when the angle of torsion > 15 degrees

Question 6

what does anteversion lead to? what compensation may arise?

Answer 6

possible femoral anterior instability;

compensation w/ toeing in

Question 7

how is the ROM of an anterverted hip

Answer 7

more IR, less ER

Overall same ROM

Question 8

what is anteversion associated w/ relatuive to femoral compensation

Answer 8

internal femoral torsion or other compensations s/a external tibial torsion

Question 9

what happens if no compensation for anteverted hip

Answer 9

toeing-in during WB in gait

Question 10

what is hip retroversion

Answer 10

angle of tosion < 8 degrees

Question 11

what type of joint is the hip joint

Answer 11

pure ovoid

Question 12

what are the main functions of the hip joint

Answer 12

mobility of the lE
load transmission b/w UE, trunk and LE
stable base for WB activities

Question 13

how can the bursae of the hip become irritated?

Answer 13

secondary to direct blow

friction or excessive compression

Question 14

where is the superficial trochanteric busae located?

Answer 14

over GT

Question 15

what is the role of the superficial throcanteric bursae

Answer 15

prevents friction b/w GT and ITB

Question 16

what is the primary role of the 6 short hip stabilizing ms?

Answer 16

Hip stabilizers provide a posterior, inferior and medial force on the femur to control FH position w/in acetabulum during activities

Question 17

what is the primary lateral glute stabilizer ms in SLS?

Answer 17

golute med

Question 18

what is the primary role of piriformis?

Answer 18

dual action in terms of IR/ER of the hip

stabilizes FH in acteablum

Question 19

how many DOF does the hip have?

Answer 19

3 DOF

Question 20

what rule does the hip joint follow?

Answer 20

convex on concave thus mvmt in opp directions

Question 21

how does the FH glide in flexion?

Answer 21

posterior glide

Question 22

how does the FH glide in extension

Answer 22

anterior glide

Question 23

how does the FH glide in ER

Answer 23

anterior glide

Question 24

how does the FH glide in IR

Answer 24

posterior glide

Question 25

how does the FH glide in abd

Answer 25

inferior glide

Question 26

what is the EF for the hip? what are the exceptions?

Answer 26

capsular except for flexion and adduction which is tissue stretch of soft tissue approximation

Question 27

what is the resting position of the hip?

Answer 27

30 flexion, 30 abd, slight ER

Question 28

what is early capsular EF for OA a sign of?

Answer 28

early hip OA

Question 29

what is early capsular EF associated w/ ?

Answer 29

decreased combined ir and extension in prone
decreased flexion/adduction
decreased FABER

Question 30

when can capsular pattern in the hip be observed?

Answer 30

in advanced stages of hip OA

Question 31

what is the capsular pattern of hip associated w/?

Answer 31

loss of IR > FLEXION, ABD > extension

Question 32

what is the CPP of the hip?

Answer 32

full extension, slight abd, IR

Question 33

when is the hip maximally congruent?

Answer 33

w/ flexion, abd and ER