AAOS Res Study Questions

Question 1

Axonotmesis (second degree nerve injury) results in ____________ distally, and the ____________ and ____________ remain intact

Answer 1

Axonotmesis (second degree nerve injury) results in wallerian degeneration distally, and the endoneurium and perineurium remain intact
wallerian degeneration, endoneurium, perineurium

wallerian degeneration, endoneurium, perineurium

the intact nature of perineurium and endoneurium allows for full recovery of a damaged peripheral nerve

Question 2

Blood supply to the lateral codyle of he elbow comes from which direction?

Answer 2

Posterolaterally

Question 3

Chromosomal translocation for ewing sarcoma

Answer 3

t(11;22)

Question 4

Chromosomal translocation in extraskeletal myxoid chondrosarcoma

Answer 4

t(9;22)

Question 5

Chromosomal translocation in myxoid liposarcoma

Answer 5

t(12;16)

Question 6

Chromosomal translocation in synovial sarcoma

Answer 6

t(x;18)

Question 7

Femoral component subsidence typically subsides into ____________ causing a ____________ deformity

Answer 7

Femoral component subsidence typically subsides into retroversion causing a external rotation deformity

retroversion, external rotation

Question 8

most appropriate surgical treatment for transfer metatarsalgia with a relatively elongated second ray

Answer 8

shortening osteotomy of the second metatarsal

Question 9

MRSA that is resistant to erythromycin may become resistant to what antibiotic, and how?

Answer 9

clindamycin; conferred by plasmid transfer - order D-zone test to ensure susceptibility

Question 10

second degree nerve injury is called?

Answer 10

Axonotmesis

Question 11

Treatment for ankle impingement caused by Bassett’s Ligament

Answer 11

resecting the thickened distal fascicle of Anterior inferior tibiofibular ligament (Bassett’s ligament is the distal fascicle of the anterior inferior tibiofibular ligament)

Question 12

What attaches to the sublime tubercle?

Answer 12

Medial collateral ligament of the elbow - primary restraint to valgus stress

anterior and transverse bands are most important

Question 13

What is the best test for differentiating charcot arthropathy, and osteomyelitis

Answer 13

White blood cell scan

Question 14

What ligament is attached to the fracture fragment in a Bennett fracture

Answer 14

Anterior oblique ligament

Question 15

What’s the consequence of excessive resetion of the medial eminence 2/2 lateral misplacement of the sagittal saw in hallux valgus surgery?

Answer 15

Hallux varus

Question 16

When compared to observation in AIS, bracing reduces the need for surgery by:

Answer 16

50%

Question 17

Which laboratory marker is highly sensitive and specific for determining the level of degenerative knee pathology

Answer 17

Stromelysin.
A matrix metalloprotease (MMP), is elevated in degenerative joint diseases including rheumatoid osteoarthritis and osteoarthritis. MMPs destroy cartilage, and elevated levels can help to elucidate osteoarthritis severity