ABOS Part I Comprehensive Review - Batch 67

Question 1

A 55-year-old male presents with medial compartment knee pain and a varus deformity. A standing full-length radiograph is obtained, as depicted in the initial state of the image below. The mechanical axis deviation (MAD) is measured to pass significa

Accepted Answer

To shift the mechanical axis laterally, through the central or slightly lateral compartment of the knee.

Question 2

A 48-year-old active patient presents with a symptomatic genu valgum deformity. Preoperative planning, as illustrated in the diagram below, involves identifying the Center of Rotation of Angulation (CORA) to precisely plan a distal femoral osteotomy

Accepted Answer

Placing the osteotomy at the CORA ensures correction of the angular deformity without creating translation.

Question 3

A 30-year-old patient with a post-traumatic tibial varus deformity and associated limb length discrepancy is being evaluated for corrective osteotomy. The surgeon plans a proximal tibial osteotomy to correct the angular deformity. Considering the pri

Accepted Answer

An opening wedge osteotomy with bone graft.

Question 4

A 60-year-old patient undergoes a high tibial osteotomy for medial compartment osteoarthritis and varus deformity. Postoperative radiographs, similar to the corrected state shown in the image below, are obtained to assess the outcome. What is conside

Accepted Answer

The mechanical axis should pass 0-5 mm lateral to the center of the knee.

Question 5

A 40-year-old patient presents with a valgus knee deformity. Radiographic analysis, similar to the principles shown in the diagram below, reveals a mechanical lateral distal femoral angle (mLDFA) of 95 degrees and a medial proximal tibial angle (MPTA

Accepted Answer

Distal femur.

Question 6

A 50-year-old male presents with symptomatic medial compartment osteoarthritis and a varus knee deformity, as illustrated in the initial state of the image below. His mechanical axis passes 20 mm medial to the center of the knee. He has a normal mLDF

Accepted Answer

Proximal tibial opening wedge osteotomy.

Question 7

A 35-year-old female presents with chronic lateral compartment knee pain and a valgus deformity. Radiographs show a mechanical axis passing 15 mm lateral to the center of the knee. Her mLDFA is 94 degrees, and her MPTA is 87 degrees. She is active an

Accepted Answer

Medial closing wedge distal femoral osteotomy.

Question 8

A 45-year-old construction worker undergoes a high tibial osteotomy for symptomatic medial compartment osteoarthritis and varus deformity. Six months postoperatively, he presents with persistent pain, and radiographs show delayed union at the osteoto

Accepted Answer

Smoking history.

Question 9

A 62-year-old patient with unicompartmental knee osteoarthritis and a significant angular deformity is being considered for either a realignment osteotomy or total knee arthroplasty (TKA). Which of the following patient characteristics would most str

Accepted Answer

High activity level with good bone stock and no inflammatory arthritis.

Question 10

A surgeon is planning a high tibial osteotomy for a patient with a varus knee deformity. The goal is to correct the varus and achieve a slight valgus overcorrection. The surgeon is considering either a medial opening wedge osteotomy or a lateral clos

Accepted Answer

A medial opening wedge osteotomy can elevate the medial joint line, potentially increasing joint line obliquity if not carefully planned.

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Key Takeaway