Joint
What kind of joint is the hip? How many degrees of freedom?
ball & socket; 3
femoral head coverage; 20-25 degrees
T/F: the transverse acetabular ligament provides hoop stress for the labrum.
true
What is the structure & function of the labrum?
fibrocartilage, deepens the socket for stability & proprioception
What is the weightbearing surface of the hip?
The Lunate Surface
the angle of inclination results in decreased joint compressive forces, increased stress on the femoral head/neck, and has increased articular contract/stability
coxa vara
this ligament is on the posterior aspect of the hip and limits extension/IR
ischiofemoral ligament
the weakness of this muscle leads to Trendelenburg Gait
glute medius
Describe the hip's joint capsule.
made of irregular, dense fibrous tissue with longitudinal/oblique fibers
anterior/superior: thick
posterior: thin
what section of the femur has more potential for failure?
zone of weakness
T/F: all the ligaments of the hip resist extension
the gracilis, sartorious, & semitendinosis insert on this structure
pes anserine
what is the closed-packed position of the hip? (ligamentous)
extension, abduction, IR
Describe hip flexion arthrokinematics.
convex on concave; posterior roll
What is the function of the ligamentum teres?
supplies blood to the head of the femur; resists IR/ER at > 90 degrees of hip flexion
describe pincher impingement
compression of the labrum between the acetabular rim and head/neck; overgrowth of the labrum
what provides innervation to the hip?
sacral and lumbar plexus
anteversion: increased angle; inc IR & dec ER; related to hip instability
retroversion: decreased angle; dec IR & inc ER; related to hip impingement
What are the two anterior ligaments? What do they resist?
Iliofemoral: resists extension, adduction, ER
pubofemoral: resists extension, abduction, ER
what is the capsular pattern of the hip?
IR > flexion >abduction> extension