Resident Academics

Question 1

Lateral Center Edge angle

Answer 1

• angle between vertical line from center of femoral head, line drawn from center of femoral head to the lateral sourcil

Question 2

Anterior center edge angle

Answer 2

• angle between vertical line from the center of femoral head, line drawn from center of femoral head to the lateral sourcil as measures on a false profile XR

Question 3

Cause of cam lesions

Answer 3

stress through the physis causes bony hypertrophy along the line of stress ( more sports, more active growing up have bigger cam lesions)

Question 4

Alpha angle (hip dysplasia)

Answer 4

line down the center of the femoral neck to a line drawn from the center of the femoral head to the point where the femoral head begins to be aspherical

Question 5

how to utilize axial CT at the level of the acetabular joint to determine if it is a column fracture or a transverse fracture

Answer 5

• medial to lateral fracture line -> column
• anterior to posterior fracture line -> transverse

Question 6

Transverse fracture of the acetabulum on XR - features

Answer 6

ALL vertical radiographic landmarks are disrupted - ilioischial line, iliopectineal line, anterior rim, posterior rim

Question 7

A break in the obturator ring indicates at least some component of what acetabular fracture type?

Answer 7

column component

Question 8

What does a spur sign on XR with an acetabular fracture indicate?

Answer 8

Associated both column fracture - this represents the constant fragment - the iliac wing component that is staying where it should be

ABCs can have secondary congruence, and in elderly people can do pretty well when non-opped (hip mechanics will be off, but whatevs)

Question 9

What feature differentiates an anterior column, posterior hemitransvere fracture different from an ABC?

Answer 9

the posterior column/transversefracture line exits in IN the joint in the anterior column posterior hemitransverse (in an ABC the posterior fracture line exits ABOVE the joint)

Question 10

What approach to use: Anterior family acetabular fracture

Answer 10

Anterior approach: ilioinguinal, AIP/lateral window

NOT an extensile approach (this is usually a distractor, bc of the complication profile, specifically HO)

Question 11

What approach to use: Posterior family acetabular fracture

Answer 11

PW< PC, PEPC, TPW

Kocher langenback approach

Question 12

What approach to use: transverse family acetabular fracture

Answer 12

T, TPW, Ttype

traditionally 0 posterio - kicher langenback

Some transverse situations require anterior, some require dual approaches to address the anterior column fracture