Hip Part 1

Question 1

Primary blood supply to femoral head in adults?

Answer 1

Medial femoral circumflex artery (MFCA) via retinacular vessels. [Anatomy]

Question 2

Ligamentum teres—role in adults vs children?

Answer 2

Minor in adults; significant blood supply in children. [Anatomy]

Question 3

Hip labrum—function?

Answer 3

Deepens acetabulum, maintains negative intra-articular pressure, distributes load. [Anatomy]

Question 4

Angle of inclination of femoral neck (adult)?

Answer 4

≈125° (coxa vara <120°, coxa valga >135°). [Anatomy]

Question 5

Normal acetabular anteversion?

Answer 5

≈20° (excess anteversion = instability; retroversion = impingement). [Anatomy]

Question 6

Most common type of pelvic fracture mechanism?

Answer 6

High-energy trauma (MVA, falls). [Fx]

Question 7

Acetabular fracture imaging study of choice?

Answer 7

CT scan. [Fx]

Question 8

Posterior wall acetabular fx mechanism?

Answer 8

Dashboard injury—axial load on flexed knee. [Fx]

Question 9

Complication risk of acetabular fx surgery?

Answer 9

Post-traumatic arthritis, heterotopic ossification, sciatic nerve injury. [Fx]

Question 10

Femoral neck fracture complications?

Answer 10

AVN, nonunion. [Fx]

Question 11

Stress fracture of femoral neck—high risk location?

Answer 11

Tension-side (superior surface). [Fx]

Question 12

Slipped capital femoral epiphysis (SCFE)—classic patient?

Answer 12

Obese adolescent male, hip/groin/knee pain, limited IR. [Peds]

Question 13

Most sensitive imaging for early AVN?

Answer 13

MRI. [AVN]

Question 14

Classic risk factors for AVN?

Answer 14

Steroids, alcohol, trauma, sickle cell, SLE. [AVN]

Question 15

Hip dysplasia radiographic measurement?

Answer 15

Center-edge angle of Wiberg <20°. [Dysplasia]

Question 16

Femoroacetabular impingement (FAI) types?

Answer 16

Cam (femoral head-neck), Pincer (acetabular overcoverage), Mixed. [FAI]

Question 17

Labral tear symptoms?

Answer 17

Mechanical catching/clicking, groin pain, positive FADIR/FABER. [Labrum]

Question 18

Hip OA radiographic features?

Answer 18

Joint space narrowing, osteophytes, subchondral sclerosis, cysts. [OA]

Question 19

Legg-Calvé-Perthes disease—classic features?

Answer 19

Boys 4–8, AVN of femoral head, limp, limited abduction/IR. [Peds]