ABOS Part I Comprehensive Review - Batch 22

Question 1

A 32-year-old male sustains a displaced diaphyseal fracture of the radius and ulna after a high-energy motor vehicle accident. During preoperative planning, the orthopedic surgeon reviews the patient's contralateral uninjured forearm radiographs to d

Accepted Answer

C. 15.3 mm at 60% of radial length from the bicipital tuberosity

Question 2

A 28-year-old construction worker presents with a malunited diaphyseal radius fracture, sustained 6 months prior, resulting in a significant loss of pronation and supination. Clinical examination reveals a fixed deformity. Based on the biomechanical

Accepted Answer

D. An angular deformity of 25 degrees in any plane, particularly involving a loss of the radial bow

Question 3

A 40-year-old female undergoes open reduction and internal fixation of a comminuted mid-diaphyseal radial fracture using the volar (Henry) approach. During the deep dissection to expose the proximal and middle thirds of the radius, the surgeon must b

Accepted Answer

C. The posterior interosseous nerve (PIN), which courses within the substance of the supinator muscle and is protected by reflecting the supinator laterally.

Question 4

A 55-year-old male presents with a comminuted fracture of the proximal third of the radial diaphysis. The surgeon opts for a dorsal (Thompson) approach for open reduction and internal fixation. During the deep dissection, after incising the fascia an

Accepted Answer

C. Identifying the posterior interosseous nerve (PIN) as it emerges from the supinator and protecting it by splitting the supinator along its course or elevating the muscle from ulnar to radial.

Question 5

A 38-year-old male undergoes ORIF for a displaced mid-diaphyseal radial fracture. The surgeon uses a standard straight 3.5 mm LC-DCP. Postoperatively, the patient experiences significant restriction in forearm pronation and supination. Intraoperative

Accepted Answer

C. Applying a straight plate to the curved radial diaphysis, which flattened the radial bow and narrowed the interosseous space.

Question 6

A 22-year-old male sustains an open, comminuted diaphyseal fracture of both the radius and ulna after a fall from a height. He undergoes emergent irrigation and debridement followed by ORIF of both bones through separate volar (Henry) and dorsal ulna

Accepted Answer

C. Radioulnar synostosis; mitigated by using dual incisions.

Question 7

A 60-year-old female presents with a chronic malunion of her radial shaft fracture, sustained 18 months prior, leading to severe restriction of pronation and supination. Imaging reveals a significant loss of the radial bow. The orthopedic surgeon pla

Accepted Answer

C. Computed tomography (CT) with three-dimensional reconstructions and advanced planning software utilizing contralateral templating.

Question 8

A 42-year-old male sustains an isolated, non-displaced ulnar shaft fracture (nightstick fracture) after a direct blow. He has no associated injuries, and his PRUJ and DRUJ are stable. Based on the provided case, what is the most appropriate initial m

Accepted Answer

C. Non-operative management with immobilization and close monitoring.

Question 9

A 30-year-old athlete undergoes ORIF for a displaced radial shaft fracture. Postoperatively, the surgeon initiates a rehabilitation protocol. In the early mobilization phase (Weeks 0-2), assuming rigid internal fixation, which of the following activi

Accepted Answer

C. Primary focus: Digital range of motion and gentle, pain-free pronation/supination; Strictly prohibited: Weight-bearing and lifting.

Question 10

A 25-year-old male sustains a complex, comminuted diaphyseal fracture of the radius. During surgical planning, the surgeon notes significant fragmentation. According to the principles of fixation for such complex fractures, what is the primary object

Accepted Answer

B. Primary objective: Restoration of length, alignment, and rotation; Recommended technique: Bridge plating.

Orthopaedic Surgery Board Exam Review: ABOS Part I & AAOS OITE Prep Questions | Part 22210

ABOS Part I & AAOS OITE Orthopaedic Review: Forearm & Distal Humerus Fractures | Part 22149

Key Takeaway