ABOS Part I Comprehensive Review - Batch 73

Question 1

A 32-year-old male presents for evaluation of progressive genu varum. Preoperative planning requires a full-length standing anteroposterior (AP) radiograph of the lower limbs. The radiologic technologist positions the patient with their feet pointing

Accepted Answer

The frontal plane projection of the knee joint will be distorted, rendering joint orientation angle measurements inaccurate.

Question 2

A 28-year-old patient with a history of Slipped Capital Femoral Epiphysis (SCFE) requires a precise assessment of proximal femoral deformity for surgical planning. The surgeon needs a true lateral view of the femoral neck, perpendicular to its axis.

Accepted Answer

The Sugioka view, with the hip flexed 90 degrees and abducted approximately 45 degrees.

Question 3

A 14-year-old male presents with a chronic, stable Slipped Capital Femoral Epiphysis (SCFE) and a measured Neck Shaft Angle (NSA) of 120 degrees on his initial AP hip radiograph (indicating coxa vara). The orthopedic surgeon plans to obtain a Sugioka

Accepted Answer

The hip should be flexed to 90 degrees and abducted approximately 60 degrees.

Question 4

A 60-year-old female presents with severe knee osteoarthritis and a suspected varus deformity. The orthopedic surgeon emphasizes the need for a full-length standing anteroposterior (AP) radiograph of the lower limbs for preoperative planning. Why is

Accepted Answer

It allows for accurate assessment of the global mechanical relationship between all joints of the lower extremity under weight-bearing conditions.

Question 5

A 50-year-old patient with a complex multiplanar deformity of the distal femur is undergoing preoperative planning. The surgeon obtains a standard full-length standing AP radiograph. However, the patient has a significant sagittal plane deformity (pr

Accepted Answer

The radiograph will appear highly distorted, making accurate assessment of frontal plane angles unreliable.

Question 6

A 40-year-old male with a history of trauma presents with a complex tibial deformity. The surgeon is meticulously planning a corrective osteotomy using Paley's principles. Which of the following statements best encapsulates the core philosophy underl

Accepted Answer

Accurate measurement is a prerequisite for effective correction.

Question 7

A 55-year-old patient with significant genu varum and a known 2 cm leg length discrepancy (LLD) in the right leg is undergoing a full-length standing AP radiograph for deformity analysis. To ensure the radiograph captures the true alignment under fun

Accepted Answer

Blocks must be placed under the shorter leg to level the pelvis.

Question 8

A 16-year-old athlete presents with chronic hip pain and a suspected diagnosis of avascular necrosis (AVN) of the femoral head. The orthopedic surgeon requires a precise radiographic view to assess the relationship of the femoral neck to the head wit

Accepted Answer

Flexing the hip to 90 degrees moves the femoral neck's orientation into the transverse plane, and abducting the thigh then rotates this plane until the neck is perfectly horizontal and parallel to the radiographic film.

Question 9

A resident is reviewing a full-length standing AP radiograph of a patient with a suspected knee deformity. The radiograph was taken with the patient's feet pointing forward, but the patellae are clearly internally rotated. The resident proceeds to me

Accepted Answer

The rotational distortion will lead to an erroneous calculation of the Mechanical Axis Deviation (MAD).

Question 10

A 70-year-old patient presents with severe bilateral genu varum and is being considered for a high tibial osteotomy. The surgeon is reviewing the full-length standing AP radiographs. Which of the following statements accurately reflects a key princip

Accepted Answer

Inaccurate measurements lead to imprecise osteotomies, residual deformity, altered joint biomechanics, and early-onset osteoarthritis.

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Key Takeaway