ABOS Part I Comprehensive Review - Batch 107

Question 1

A 52-year-old woman presents with non-specific right hip pain 3 years after a right metal-on-metal (MOM) hip resurfacing. Her anteroposterior (AP) radiograph is shown below. Based on the provided image and case discussion, which of the following find

Accepted Answer

A higher than recommended acetabular abduction angle (lateral opening).

Question 2

A 52-year-old woman with a 3-year history of right metal-on-metal hip resurfacing presents with non-specific right hip pain. The examiner asks about the difference between ALVAL and pseudotumour. Based on the case discussion, which statement accurate

Accepted Answer

A pseudotumour is considered a more severe inflammatory reaction than ALVAL, which is characterized by metal particulate debris and localized osteolysis.

Question 3

Following the diagnosis of a pseudotumour in a 52-year-old woman with a painful MOM hip resurfacing, the examiner asks about risk factors. Which of the following combinations of patient characteristics and implant features would represent the highest

Accepted Answer

Female patient, age 38, small component size, history of hip dysplasia.

Question 4

A 52-year-old woman with a painful MOM hip resurfacing is being investigated for her symptoms. The examiner asks about the British Hip Society's recommendations for investigation. Beyond a careful history and physical examination, which of the follow

Accepted Answer

Measurement of blood cobalt and chromium ion levels.

Question 5

A 52-year-old woman with a painful MOM hip resurfacing undergoes further imaging after elevated metal ion levels. The MRI scan with metal artifact reduction sequences (MARS) is shown below. Based on the images and the case, what is the most appropria

Accepted Answer

Schedule urgent revision surgery to the hip.

Question 6

During the discussion of revision surgery for the pseudotumour, the examiner asks about the principles of surgery. Which of the following surgical principles is most consistent with the candidate's recommended approach for this patient?

Accepted Answer

Thorough debridement of all abnormal soft tissue, using an uncemented metal-on-polyethylene bearing, with consideration for a constrained cup if instability is present.

Question 7

The examiner challenges the candidate on the utility of MOM hip resurfacing, suggesting that conventional THA works equally well. The candidate defends resurfacing by listing its advantages. Which of the following is NOT listed as an advantage of MOM

Accepted Answer

Lower revision rates compared to conventional THA.

Question 8

The examiner asks about contraindications for hip resurfacing. Based on the detailed list provided by the candidate, which of the following patient profiles would be an absolute contraindication for hip resurfacing?

Accepted Answer

A 60-year-old male with severe osteoporosis and insufficient bone stock in the femoral head.

Question 9

After successful revision surgery for the pseudotumour, the patient's postoperative radiograph is shown below. The examiner notes that the patient was kept non-weightbearing for 6 weeks due to an extensive anterior wall defect in the acetabulum. This

Accepted Answer

Acetabular component loosening or migration.

Question 10

The examiner asks about the outcomes of hip resurfacing compared with conventional THA. Based on the case discussion, which statement accurately summarizes the comparative outcomes?

Accepted Answer

Both procedures yield identical Harris hip scores, but hip resurfacing is associated with a higher percentage of patients involved in high-demand activities and a higher revision rate.

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Key Takeaway