Slippery hips
Hips Don't Lie
Rad intern
100
This complication can occur in 25-50% of unstable SCFE and <10% of stable SCFE.
What is osteonecrosis of the femoral head (AVN)?
100
This timeframe is when femoral head ossification occurs.
What is 4-6 months?
100
The alpha angle on hip ultrasound measures the angle between these two structures.
What are lines of the acetabulum and the ilium?
200
On examination, patients with SCFE present with this position of the affected hip.
What is a obligatory external rotation?
200
This physical exam finding can be seen in Developmental dysplasia of the hip.
What is Galeazzi Test?
200
This is where a normal femoral head should be found in relation to (1) Hilgenreiner's line, and (2) Perkin's Line.
What is (1) Inferior to Hilgenreiner's line, and (2) Medial to Perkin's line?
300
This is the difference between a stable and an unstable SCFE.
What is the ability to bear weight?
300
These muscles are involved in the injury displayed in this radiograph.
What are hamstrings, involved in ischial tuberosity avulsion injury?
300
This is the range of alpha angle measurements that is considered abnormal in DDH.
What is <60 degrees?
400
This is the artery that provides the most blood to the femoral head in a patient older than age 4 years.
What is the medial femoral circumflex artery (C)?
400
This structure is the strongest of the hip capsule ligaments and limits hip extension.
What is the iliofemoral ligament (ligament of Bigelow)?
400
This structure can become interposed and prevent a concentric hip reduction.
What is an inverted limbus?
500
(1) This is the number of screw threads that should cross the physis with percutaneous in situ fixation of SCFE in order to prevent slip progression, and
(2) This is the technique to confirm that the screw did not violate the hip joint.
(1) What is 5 threads?
(2) What is the Approach-withdraw technique (max IR and max ER under live fluoro)?
500
This is a key difference in acetabular deficiency location between DDH and neuromuscular dysplasia.
What is anterolateral acetabular deficiency in DDH, and posterosuperior acetabular deficiency in neuromuscular dysplasia?
500
This line is named (1) and is seen to be abnormal on this side of the radiograph (2).
What is (1) Klein's line, and (2) the left side?
600
Placement of a screw in this quadrant of the femoral head has a high risk of violating the hip joint and subsequent chondrolysis.
What is anterior/superior quadrant?
600
Extreme hip abduction >60 degrees in this harness may lead to this complication.
What is AVN?
600
The leg length discrepancy is due to what etiology?
What is Fibular hemimelia?
700
SCFE affects this zone of the physis.
What is the hypertrophic zone?
700
A mutation in this protein can lead to impaired endochondral ossification of multiple epiphyses, and patients can present with synchronous bilateral femoral head AVN and short metacarpals/metatarsals.
What is COMP (cartilage oligometric matrix protein)?
Mutation in COMP leads to Multiple epiphyseal dysplasia.
700
(1) This procedure can be used to treat acute unstable slips, and correct deformity while also protecting femoral head blood supply, however (2) this complication may still occur in long term follow-up studies.
What is (1) Modified Dunn procedure, and (2) AVN?
800
The X-ray depicts this angle for measuring SCFE severity.
What is the Southwick slip angle?
800
This Waldenstrom radiographic stage of Legg Calve Perthes disease is used to determine Lateral Pillar classification for prognosis.
What is fragmentation stage?
800
This is the structure labeled #4.
What is the labrum?