Hip bone Flashcards Preview

Leg > Hip bone > Flashcards

Flashcards in Hip bone Deck (16):

what are the 3 articulations of the hip bones?

1. sacroiliac joint - sacral with ilium
2. pubic symphysis - the 2 hip bones (between the 2 pubis)
3. hip joint - articulates iliac with head of humerus


what are the 3 parts of the hip bone and what joins them together?

1. ilium
2. ischium
3. pubis
the 3 parts are joined together by triradiate cartilage which fuses together at puberty and forms the 'socket' joint (acetabulum) for articulation of the head of femur --> hip joint


what is the pelvic girdle?

bony structure connecting axial skeleton to lower limb



the largest + widest part of the pelvis, forms superior acetabulum, expands to form 'wing' (ala)
has 2 surface: iliac fossa (concave) + gluteal surface (convex)
the top is thickened forming iliac crest, spanning from anterior superior iliac spine --> posterior superior iliac spine


which muscles attach to the ilium?

1. iliac muscles @ iliac fossa
2. gluteal muscles @ anterior, posterior, inferior lines
anterior superior iliac spine, anterior inferior iliac spine, posterior superior iliac spine


clinical: anterior superior iliac spine (ASIS) as a landmark?

inguinal ligament runs from ASIS to pubic tubercle (top of pubic symphysis) , femoral artery mid-way along ASIS, femoral vein medial to femoral artery


what is a patient's true leg length? how is it different to apparent leg length?

true leg length: measured from ASIS --> medial malleolus (most distal part of tibia)
apparent leg length: umbilicus (near belly button) --> medial malleolus



most anterior part of pelvis, has body and 2 rami (branches): superior and inferior
superior rami projects laterally, forms inferior part of acelabulum
inferior rami projects towards body, other end joining with ischium
the 2 opposite bodies articulate at the pubic symphysis
the 2 rami enclose the obturator foramen: obturator nerve, artery + vein passes through to reach lower limb



posterioinferior part of hip bone, formed by ischium
composed of body, superior and inferior rami
inferior ischial rami: combines with pubis inferior rami to form ischiopubic rami (enclosing part of obturator foramen)
posterior ischial rami: forms ischial tuberosities --> weight falls here when sitting


Landmarks of posterior ischium

indentation: lesser sciatic notch
most inferior edge: ischial spine


name the 2 important ligaments attaching to the ischium

1. sacrospinous ligament
2. sacrotuberous ligament


sacrospinous ligament

from ischial spine to sacrum
creates greater sciatic foramen (lower limb neurovasculature esp. sciatic nerve and piriformis muscles travel through


sacrotuberous ligament

from ischial tuberosity (posterior ischium) to sacrum, and posterior superior iliac spine
forming lesser sciatic foramen


Fractures of the pelvic bones causes?

1. direct trauma to pelvic bones e.g. vehicular accident
2. forces transmitted from the lower limb e.g. heavy fall on feet


where does fractures of pelvic bones normally occur?

weaker points of bones:
pubic rami (branches of pubis), acetabulum 'socket', region of sacroiliac joint


what's a common complication of pelvic fracture?

soft tissue injury esp. bladder + uretha