Hip Flashcards
CAM deformity
Presence of excessive bone in the femoral head-neck region
An excessive (>60°) alpha angle
EMG studies have concluded that what exercise in weight bearing that produces significant gluteus medius muscle activity?
SL squat
Only direct muscular attachment to the sacrum
Piriformis
What 2 ligaments form the walls of the greater and lesser sciatic foramina
Sacrotuberous and sacrospinous ligaments
The amount of hip ROM is determined primarily by what?
Depth of the acetabulum and capsuloligamentous restraints
T/F: the entire femoral head is covered in hyaline cartilage?
False, all but the fovea (attachment of ligamentum teres)
Does the hip cartilage have vascular or neural supply?
It is limited with vascularity and aneural
Can pain in the hip be a result of cartilage involvement?
No, it’s aneural
Name of ligament connecting femur to acetabulum and location of attachment on femur
Ligamentum teres, fovea
Normal angle of inclination of the femoral neck/head
120°-125°
Coxa vara
- angle
- presentation
Angle of inclination <120°
Developmental or acquired
LLD, limping gait pattern, functional hip abd muscle weakness
Coxa valga
- angle
- presentation
Angle of inclination >135°
Compromised jt congruency = instability
Hip version (torsion) angle
Normal 8-20°
Anteversion of the hip
- high/low version angle
- in/out toeing
- Excessive ROM/limited ROM
High angle (>20°), In-toeing, excessive IR, limited ER
Retroversion of the hip
- high/low version angle
- in/out toeing
- Excessive ROM/limited ROM
Low version angle, out toeing, excessive ER, limited IR
What part of the proximal femur is most susceptible to fx?
Inferior area of the femoral neck (no trabuculae bone in that region)
Pincer FAI
Acetabulum has too much bone laterally (aka “over-coverage”)
Measured by LCEA (>40°)
Commonly associated with a retroverted acetabulum
Imaging of choice for diagnosis/assessment of acetabular angles (all)
CT
What region is cartilage the thickest in the acetabulum?
Superiorly (corresponding with weight bearing function)
What is located at the central acetabular fossa?
Fat pad, no cartilage
Are hip labral tears associated with degenerative changes
May be a precursor to cartilage damage due to not being able to distribute forces widely (happens in small area)
3 primary extra-articular ligaments
1) Iliofemoral
2) Pubofemoral
3) Ishiofemoral
What region of the hip is the capsule the thinnest
Posterior/inferior
Iliofemoral ligament limits what motion?
Extension, ER, add (superior band), abd (inf band)
Pubofemoral ligament limits what motion?
Abduction, secondary extension
Ishiofemoral ligament limits what motion?
IR, ext
Relevance of ligamentum teres in pediatrics
Thought to provide blood supply early on and decrease into adulthood
T/F: ligamentum teres plays a role in stability at the hip
Possibly, studies suggest it may help
Primary flexors of the hip
Iliopsoas and rectus femoris
Secondary flexors of the hip
Sartorius, TFL, pectineus, adductor longus
Young athlete, kicking sport, anterior hip pain should be screened for what?
Proximal rectus femoris apophyseal avulsion
Primary extensors of the hip
Gluteus max, HS
Secondary extensors of the hip
Glute Med, adductor magnus
T/F: the glute max also helps with hip abd and ER
True
Primary hip abductors
Glute med, glute min
Secondary hip abductors
TFL, glute max, piriformis, sartorius
All depends on position of the hip
Primary hip adductors
Adductor complex (add brevis, add longus, add magnus), pectineus, gracilis
T/F: there are no primary hip internal rotators
True, IR is not the primary function of any muscle in the hip region
3 clinically relevant bursae in the hip/pelvic region
1) Greater trochanter bursa
2) Iliopsoas bursa
3) Ischial bursa
Borders of the femoral triangle (anterior hip)
Upsidedown triagle shape:
Top = inguinal lig.
Lat = sartorius
Med = Add longus
Floor = iliopsoas and pectineus
What is the primary arterial supply for the leg
Femoral artery
Relevance of the femoral medial and lateral circumflex arteries
Branch off femoral artery, supply innervation to femoral head, if compromised causes AVN
Femoral nerve has what root levels
L2-L4
Vascular supply of the posterior hip
Branches of the internal iliac artery
Glute max and glute med/min/TFL are innervated by which gluteal nerves
Glute max = inferior gluteal
Glute med/min/TFL = superior gluteal
Loose packed position of the hip
30° flexion, 30° abduction, slight ER
Position for hip maximal articular congruency
90° hip flexion, slight abd and ER (quadruped)
However, position where jt dislocation is most common
Trendelenburg sign = drop ___ cm’s
> 2cm
Corticosteroid use can lead to what 2 conditions in the hip
AVN and fractures
Fluoroquinolone antibiotics can cause what condition at the hip
Gluteal tendinopathy
So if you have a pt with tendonitis and no MOI or other cause, screen for antibiotics
Slipped capital femoral epiphysis
- What is it
- Age range
- Sex
- Risk factor
- Unilat vs bilat
Growth plate is damaged and the femoral head moves (“slips”)
8-15 y/o, males, increased risk with obesity, bilat is common
If stable = non-surgical
If unstable = surgery
Legg-Calve-Perthes disease
- What is it
- Age range
- Sex
Disrupted blood supply to femoral head is temporarily interrupted = transient necrosis of the bone and deformities
4-10 y/o, boys
Self-limiting, non-surgical most of the time unless severe
Coxa saltans
aka Snapping hip syndrome
Iliopsoas over femoral head or proximal iliotibial tract over the greater trochanter
“C” sign typically indicates
Hip pain, impingement
Clinical prediction rule for inflammatory back pain - AS (can be hip as well)
1) Age <40 y/o @onset
2) Insidious onset
3) Better w/ exercise
4) No improvement w/ rest
5) Pain during 2nd half of night that improves w/ walking
How to differentiate between infection of the hip and gout
Typically will have big toe pain with gout
Reiter syndrome
aka Reactive arthritis
Type of arthritis that occurs due to an infection
Think: Can’t see, can’t pee, can’t climb a tree
Symptoms of hip fx
Extreme pain, extreme difficulty WB/flexing
and rotating hip/ambulating
AVN
30-50 y/o
Atraumatic
Very commonly had corticosteroid use
Pain >6wks
No ROM deficits early, but can mimic OA late
- D/T loss of blood supply
2 risk factors for stress fractures in endurance athletes
Female, previous stress fx
Female athlete triad
Low energy availability, menstrual dysfunction, low bone mineral density
Can put them at higher risk for stress fx’s
Compression-sided femoral neck stress fractures (FNSF)
Inferior-medial neck, LOW risk, non-surgical
Tension-sided femoral neck stress fractures (FNSF)
Superior-lateral neck, HIGH risk
Pubic rami stress fx
LOW risk, non-surgical, pain at inguinal/perineal regions
Symptoms of stress fx
Gradual onset, worse w/ activity and better w/ rest, pain at end-range PROM (specifically IR)
Patellar pubic percussion test
Stethoscope over pubic tubercle, tap on ipsilat patella
+ = lack of/diminished sound, pain
Good for femur fx’s, but unknown for stress fx’s
Gold standard for diagnosis of stress fx’s
MRI
Common Lumbopelvic screening tests
Prone instability test, thigh thrust, prone knee flexion test, lumbar ROM (single and repeated), neural tension tests, SIJ provocative tests
Are the SI joint cluster findings good at ruling in (specificity) or ruling out (sensitivity) SIJ pain?
Ruling OUT = 94% for 3/5 positive tests
To rule out pelvic involvement in hip pain what is the best outcome measure?
PGQ