PLAB 1 questions

Question.

A 85 year old man is due for elective right hip arthroplasty.

What nerve is at risk of injury at the back of the hip during this procedure?

    1. Femoral Nerve
    2. Lateral cutaneous femoral nerve
    3. Sciatic nerve
    4. Pudendal Nerve
    5. Peroneal nerve

Answer.

b. 

 
Explanation.

During the posterior approach to the hip, the most predictable course of the sciatic nerve is deep to the piriformis and superficial to the short external rotators exiting above the superior gemellus at the back of the acetabulum. As such, most recommend identification of the sciatic nerve by palpation in hip replacement.

 

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