Hip APTA Flashcards
In general which directions does the acetabulum face?
- ventrally, laterally, and caudally
What does the collodiaphyseal (CD) angle of the femur refer to?
- the superior medial orientation of the femoral neck.
What is the normal CD angle in children, and what does it develop to?
- 150, decreasing to ~120-130 in adulthood from weight bearing
Coxa vara refers to a CD angle of: _____?
- <120*
What does the center edge angle (CE) refer to?
What is normal?
What is abnormal?
What can influence the angle?
- angle between the acetabulum and femoral head in the frontal plane.
- normal would be ~30*
- angle < 30* signifies dysplastic changes in the joint
- can be influenced by variations in shape of the superior lateral acetabular edge
How does the orientation of the femoral head/neck in the transverse plane change during development?
- Starts with ~40* anterior orientation, decreasing to ~9*; relative to the line between the distal epicondyles
What is considered an anteverted hip? What are the consequences?
What is considered a retroverted hip? What are the consequences?
- excessive anterior rotation is anteversion. Hip ER is decreased to maintain the 90-100* total rotational ROM in the transverse plane. Increases compressive forces on cartilage and may result in tendinopathies
- decreased anterior rotation is retroversion. Hip IR is limited, with increased ER. Could produce early degenerative changes in the anterior superior acetabular labrum
What is the distribution of cartilage in the acetabulum?
- hyaline cartilage covers ~2/3rds
- no cartilage in the center where the ligamentum teres comes through
- thinner in the superior dome and anterior/inferior region
- thicker in the posterior and anterior/superior portion of the acetabulum, where the femoral head has the most contact during the gait cycle
A dysplastic hip has a more ______ head. What is the converse?
- dysplastics hips have more elliptical heads, while those with deeper acetabulums typically have more spherical heads
What is the role of the labrum?
- increases depth of acetabulum
- maintains articular seal
- load support
- joint lubrication
- proprioception; many sensory receptors are located in labral tissue
How well is the acetabulum vascularized?
- similar to the meniscus; outer portions are better vascularized than the inner portions.
- Additionally, the superior portion of the labrum is less well vascularized
What are the 3 different fiber systems of the capsuloligamentous structures of the hip?
- longitudinal: proximal to distal fibers. Creates tensile restraint to capsule
- transverse: encircles the diameter of the capsule around the neck, creating Zona Orbicularis
- arcuate: create loops at the proximal insertion of the labrum, reinforcing that insertion
T or F;
The ligamentum teres can be a significant source of hip pain or mechanical symptoms.
T
What are the two branches of the iliofemoral ligament, their connections, and what do they restrict?
- pars inferioris: constrains hip extension. Iliac outer wall of acetabulum to the attachment on the intertrochanteric line on the anterior proximal femur.
- pars superioris: constrains hip extension, adduction, and external rotation. Same proximal attachment, but courses inferolaterally to the intertrochanteric line just anterior to the greater troch.
- in flexion, limits ER
- in extension, limits ER and IR
What is the course of the pubofemoral ligament and what does it restrict?
- constrains extension, abduction, and ER
- from the pubic outer wall of the acetabulum to the same attachment as the pars interarticularis of the iliofemoral ligament
What are the differences in what the iliofemoral ligament limits in flexion and extension?
- in general limits extension.
- however, in flexion, limits ER
- in extension, limits ER and IR
What is the course of the ischiofemoral ligament, what ligament does it assist, and what is it’s general function?
- ischial outer wall of acetabulum to the posterior capsule.
- assists the arcuate ligament (courses from lesser to greater trochanter on the posterior joint capsule)
- generally, these both support the posterior capsule and add stability in quiet standing, as they are taut in the upright position
T or F;
You can have a Hill Sachs lesion on a hip.
- T
What nerve is found in the inguinal canal?
- ilioinguinal nerve
- can become entraped in the canal
T or F;
The iliopsoas passes over the ilioinguinal ligament.
- F
- Ilioinguinal ligament passes lateral to medial from the ASIS, and is pretty superficial
The anterior coxafemoral joint is innervated by which two nerves?
- sensory branches of the femoral and obturator nn.
The posterior CFJ is innervated by which nerve?
- innervated by branches of the sacral plexus
The origin of which muscles are prone to avulsion fractures in adolescents?
- rectus femoris (AIIS)
- sartorius (ASIS)
What landmarks can help palpation of the pectinius?
- it lies distal to the ilioinguinal ligament and medial to the femoral artery.
- attaches to the pectin pubis and femoral pectineal line
What is the orientation of the adductor longus w/ connections?
- emerges from the caudal surface of the pubic tubercle, running down the medial thigh to the mid posterior medial femur
What is the orientation of the gracilis w/ connections?
- originates medial and posterior to the adductor longus on the inferior pubic ramus, attaching to the pes anserine.
T or F;
The adductor brevis cannot be palpated.
- T
What is the orientation of the adductor brevis with connections?
- anterior pubis just deep to the adductor longus and gracilis.
- covered by those muscles and can’t be palpated
What is the orientation of the adductor magnus with connections?
- emerges from the inferior pubic and ischial rami with multiple connects along the length of the femur below the neck
What are the connections of the glute max?
- proximally from the iliac crest, PSIS, dorsal sacrum and coccyx to the posterior IT band and gluteal tuberosity running in a line distally, which is just distal to the greater troch
- proximal attachment intertwines with the thoracolumbar fascia and the dorsal sacroiliac ligament
What is the orientation/connections of the piriformis?
- deep to the glute max.
- anterior sacrum to the posterior greater troch
- ER that extends and abducts the flexed thigh
What are the hip ERs? Other than the piriformis, where do they attach distally?
What is their likely function?
- piriformis, superior/inferior gemelli, obturator interus/externus, and quadratus femoris
- they all insert just inferior to the piriformis on the greater troch. Quad femoris more significantly lower, along a line
- ER; but likely also improve load bearing through the CFJ; kind of like the RC?
The insertion of the glute med/minimus is prone to what degenerative development?
- calcification, with chronic tendinopathy and mechanical deficiency with potential to tear
What % of adults over the age of ____ may have painless glute med tears?
- 10% of adults over the age of 60
Where is the trochanteric bursa found?
- in proximity of the posterior greater troch.
- several layers of synovial-lined bursa
Where is the ischiogluteal bursa found?
- under the glute max, just posterior to the ischial tuberosity
Where can the iliopectineal bursa be found?
- deep to the iliopsoas tendon, just anterior to the iliopectineal eminence.
The anterior pubic symphysis sends sensory information back through which spinal levels?
The posterior pubic ramus sends sensory information back through which spinal levels?
What are the implications?
- anterior pubic symphysis: L2-4. thus can have referred groin pain when those levels are irritated.
- posterior pubic ramus: S3-5. can produce genital pain with pathology
What motions occur in the CFJ relative to the acetabular plane with anatomical flexion? Extension? Abduction?
- Flexion: flexion, abduction, and internal rotation
- Extension: extension, adduction, external rotation
- Abduction: abduction, extension, external rotation
- Adduction: adduction, flexion, external rotation
Peak force at the acetabulum during gait is ____ to ____ x body weight.
- 1.8 to 3.8 times body weight
- this is increased with increased anteversion
In general, what regions are loaded in the acetabulum during the gait cycle?
- at initial loading, the dorsolateral aspect of the acetabulum, with the ventrolateral aspect taking most of the load during the propulsive end of the gait cycle
- that said, there’s a fair amount of variation between individuals