Pelvis Flashcards
3 pelvis bones
sacrum and 2 hips
what does the pelvis look like
bowl/ basin
what are the joints of the pelvis
symphysis pubis
sacroiliac joint
pelvic girdle
the ASIS/ pubic tubercle line up in
coronal plane
ASIS LINE UP IN
transverse plane
acetbalulum is located
inferiolaterally
functions of pelvis
support and protect pelvic organs
provide bony support to birth canal
provides extensive muscle attachment
support weight of head and trunk
allows weight transfer of trunk to
lower limb
standing weight goes to
femur
sitting weight goes to
ischial tuberosity
pelvic inlet
pubic crest/ pectineal lines/ acurate line/ sacral alar/ promontory
superior
the greater pelvis is superior to this
pelvic outlet
apex of the coccyx ischial tuberosity pubic symphysis
lesser pelivis is superior to this but inferior to inlet
female vs male pelvis
inlet is more round in female
ischial spines further apart in female
sacral prominance greater in males
sub pubic angle is more broad in females
wings of illium are wider in females
pubis sympysis
secondary
cartilegenious
b/w the syphmyseal surfaces
fibrocartledge disc
limited movement except in pregenancy the fibres softern due to relaxation hormone
sacroilliac joint anterior
anterior- synovial plane non axial
aricular area of illium
aricular surface of the sacrum
sacroilliac joiint posterior
posterior- fibrous joint
due to large amount of interosseius ligament
tuberosity - illiac and sacral
the sacroiliac joint surfaces in posterior
ridges complementry and ridges peaks and trooughs are complementry to each pther will interlock and stabilise the joint
sacroilliac ligament is found
anterior and posterior
posterior is long/ short fibres
illliolumbar ligament
illiac crest to the transverse proccess of verterbra
interoseus ligament
syndemossi- posterior aspect
inside joint will be anterior to posterior aspect
what form the sciatic foramen
sacrotuberious
sacrospinus
sacrotuberous ligament
lateral and large ligament
sacrum to ischial tuberosity
sacrospinus
deeep to sacrotuberous
sacroiliac joint features
60 percent of body weight
able to self lock
stable for weight transfer
sacrum is wedged inferior direction
when sacrum is wedged inferior what occurs
the sacroilliac joint interlocks
interosseius ligament becomes under tension
iliac bones pull towards sacrum to increase stability
sacroilliac joint moves due to
force not muscle contraction
nutration
anterior rotation of the superior sacrum
counternutration
anterior rotation of inferior sacrum
nutration resisted by
sacrotuberous
sacrospinus
under tension
counternutration resisted by
posterior sacroilliac ligament
oppose supporter by multifidus
form closeure
passive structures that interlock surface- ridges and grooves
stability of joint b/c surface allign relate to gravity
tension in restraint ligaments
force closure
active structures
fascia/ connective tissue/ muscles
cross the pelvic joint
e.g myofascia slings
myofascia slings
cross joints
posterioisty
posterior
anterior
enahance compression of the joint surface assist in joint stability
sacrum
wedged inferior
irregular joint interlock
ligaments under tension mean sacrum
is stopped sliding inferiorly
ligaments attached to sacrum means ilia
held tightly
when does nutration occur
when sacrum absorb shock
as superior sacrum moves anterior
inferior coccyx will move posterior
motion is opposed by wedge/ irregular bone shape
integrity os posterior ligaments supported by muscles insert into ligaments
pelvis lift the lesser trochanter
gets closer to the ischial tuberoisty
pelvis drop the lesser trochanter
gets further from the ischial tuberosity
pelvic drop produced by muscles
concentric= ipsilateral glut med/ contrlateral EO/IO contralateral hip adductors
eccentric= contralateral glut med// ipsilateral hip adductors and EO/ IO
PELVIC LIFT PRODUCED BY MUSCLES
concentric-contralateral glut med// ipsilateral hip adductors and EO/ IO
ecentric- ipsilateral glut med/ contrlateral EO/IO contralateral hip adductors
pelvic tilt produced posterior
concentric- hip extnesor/ abdominals
eccentric- erecotor spinae/ hip flexors
pelvic tilt produced anterior
hip extnesor/ abdominals - eccentric
erecotor spinae/ hip flexors- concentric
pelvic rotation to the right produced
left I/O and right EO
left hip external rotators
right hip medial rotation
pelvic rotation to left produced
right I/O left E/O
right hip external rotators
left hip medial rotators
