DEX IOT DAY 5 TEST NEWEST ACTUAL

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DEX IOT DAY 5 TEST NEWEST ACTUAL

EXAM 200 QUESTIONS AND CORRECT

DETAILED ANSWERS (VERIFIED ANSWERS )

|ALREADY GRADED A+

Anatomic location of lesser troch indicates... - ANSWER- Degree of rotation

Is there any significant risk to blood supply with lateral approach to proximal femur fx fixation? - ANSWER- No

What is potential risk involving blood supply in femoral neck fx? - ANSWER- Retinacular arteries supply femoral neck and head; fracture at femoral neck leads to avascular necrosis of head

Garden classification for femoral neck fx: - ANSWER- Type I: incomplete, valgus impacted 1 / 4

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Type II: complete, undisplaced

Type III: complete, displaced, some bone intact

Type IV: displaced fracture

What percent of femoral neck fx occur in women? - ANSWER- 80%

Treatment options for femoral neck fx: - ANSWER- Garden

type I and II treated with closed pinning (3 screws) Garden type III and IV treated with THA, hemiarthroplasty, or closed pinning depending on age/health of patient

What percent of intertroch fractures occur in women? -

ANSWER- 70%

Classification for intertroch fractures: - ANSWER- Stable, two-

part Unstable, comminuted Reverse obliquity

What is the start point for the troch nail? - ANSWER- Tip of greater trochanter (due to slight angle of bone so instrumentation doesn't have to be right on top of patients) 2 / 4

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What is anterior bowing? - ANSWER- 113 cm radius of anterior curvature

Which two nails are biomechanically similar? - ANSWER- Short and ES

Which nail should be used for subtroch? - ANSWER- Long nail with static locked nail

How do you fixate reverse obliquity fx? - ANSWER- Long nail, locked and static lag screw

Which fx pattern has bimodal distribution? What % of fx are this type? - ANSWER- Subtroch - young males, old females; 10-30% of all hip fx Associated with bisphosphonate use for osteoporosis

Pro of ES nail over short nail? - ANSWER- Crosses past ismus of shaft, can lead to less pain and more rotational stability

Width of lag screw and anti-rotation screw? - ANSWER- 10.5 mm, 5 mm 3 / 4

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Neck angle options for all nails? - ANSWER- 125 degrees and 130 degrees

Prox diameter of all nails: - ANSWER- 15.9 mm

Categories of subtroch fx: - ANSWER- Simple, wedge, complex

Which fx pattern is intracapsular? Which are extracapsular? - ANSWER- Femoral neck; Intertroch & Subtroch

What length are all short nails? - ANSWER- 20 cm

What lengths do long and ES nails come in? - ANSWER- 30, 33, 36, 39, 42 cm

Medial migration of lag screw solved by? - ANSWER- Locking ring on lag screw

Lateral protrusion backout on lag screw solved by? How much post-op captured collapse can you get? - ANSWER- Telescoping lag screw; up to 10 mm

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