A 22-year-old man presents 8 weeks after a high-speed motorcycle collision with temporal bone fracture. He reports severe left-sided hearing loss without pain, discharge, vertigo, or facial weakness. Otoscopic examination reveals an intact left tympanic membrane. Weber test lateralizes to the left ear, and Rinne test is negative on the left. Pure-tone audiometry of the left ear is shown in the diagram marked **A**, demonstrating an air-bone gap of approximately 55 dB with normal bone conduction thresholds. High-resolution CT temporal bone shows incudostapedial joint separation. Which of the following best explains the audiological finding marked **A**?
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