lecture 5 hip arthrology Flashcards
Where is the femoral head?
located just inferior to mid 1/3 of inguinal lig
What is the shape of the femoral head?
2/3 of nearly perfect sphere
What is posterior to the center of the femoral head?
the fovea
What is the femoral head covered in (except fovea)?
articular cartilage
What is the ligamentum teres?
tubular, synovial-lined connective tissue housing acetabular artery, contains mechanoreceptors
Where ligamentum teres run?
Transverse acetabular ligament to fovea
What is the acetabulum?
deep, cuplike socket
What is the acetabular notch?
60-70 degree opening
What is the acetabular fossa?
floor of fossa, no cartilage, no contact, filled with fat/blood vessels/synovial membrane/lig
Where does the femoral head contact?
the lunate surface - covered in articular cartilage thickest along sup-ant region matching area of highest joint force with walking
When does the acetabulum notch widen, lunate deform, contact increase in area/ and pressure decrease during gait?
Midstance
How much does the area of the joint increase from the lunate surface during swing phase to the midstance phase?
20% during swing phase to 90% during mid stance phase
What is the acetabular labrum?
strong, flexible ring of fibrocartilage on the rim of the acetabulum
What lig spans the acetabular notch?
transverse acetabular lig
What blends with articular cartilage of the acetabulum - labro-chondral junction?
internal labrum
What does the acebtabular labrum do?
Provides mechanical stability “grip” and deepens socket
What does the “seal” of the acetabuluar labrum do?
keeps negative pressure, fluid sealed (reduced friction/contact stress and improved lubrication to joint)
What is the innervation and vascularization of the acetabular labrum?
poorly vascularized but well innervated (pain and proprioception)
