hip anatomy and biomech Flashcards
what are the articulating structures that make up the hip joint
acteabulum and femoral head
how is the femoral head oriented?
faces superiorly, anteriorly and medially
what is the angle of inclination of the FH
125 degrees
what is the angle of torsion of the FH
the anhle b/w the axis of the femorl neck and the transcondylar axis
~8-15 degrees
when does anteversion of the FH occur?
when the angle of torsion > 15 degrees
what does anteversion lead to? what compensation may arise?
possible femoral anterior instability;
compensation w/ toeing in
how is the ROM of an anterverted hip
more IR, less ER
Overall same ROM
what is anteversion associated w/ relatuive to femoral compensation
internal femoral torsion or other compensations s/a external tibial torsion
what happens if no compensation for anteverted hip
toeing-in during WB in gait
what is hip retroversion
angle of tosion < 8 degrees
what type of joint is the hip joint
pure ovoid
what are the main functions of the hip joint
mobility of the lE
load transmission b/w UE, trunk and LE
stable base for WB activities
how can the bursae of the hip become irritated?
secondary to direct blow
friction or excessive compression
where is the superficial trochanteric busae located?
over GT
what is the role of the superficial throcanteric bursae
prevents friction b/w GT and ITB
what is the primary role of the 6 short hip stabilizing ms?
Hip stabilizers provide a posterior, inferior and medial force on the femur to control FH position w/in acetabulum during activities
what is the primary lateral glute stabilizer ms in SLS?
golute med
what is the primary role of piriformis?
dual action in terms of IR/ER of the hip
stabilizes FH in acteablum
how many DOF does the hip have?
3 DOF
what rule does the hip joint follow?
convex on concave thus mvmt in opp directions
how does the FH glide in flexion?
posterior glide
how does the FH glide in extension
anterior glide
how does the FH glide in ER
anterior glide
how does the FH glide in IR
posterior glide
how does the FH glide in abd
inferior glide
what is the EF for the hip? what are the exceptions?
capsular except for flexion and adduction which is tissue stretch of soft tissue approximation
what is the resting position of the hip?
30 flexion, 30 abd, slight ER
what is early capsular EF for OA a sign of?
early hip OA
what is early capsular EF associated w/ ?
decreased combined ir and extension in prone
decreased flexion/adduction
decreased FABER
when can capsular pattern in the hip be observed?
in advanced stages of hip OA
what is the capsular pattern of hip associated w/?
loss of IR > FLEXION, ABD > extension
what is the CPP of the hip?
full extension, slight abd, IR
when is the hip maximally congruent?
w/ flexion, abd and ER
