One of the city’s top spinal surgeons sexually harassed his research assistant into a miscarriage, according to a lawsuit.

Yamuna Kanazawa, 27, was bombarded by advances from Dr. Oheneba Boachie-Adjie — named a top doctor by New York magazine — while working at the Hospital for Special Surgery, says the suit, filed last week in Manhattan Supreme Court.

After she took her boyfriend on a “research retreat,” the doc allegedly cut her pay. The stress caused her to miscarry, the suit says.