Disappearance of femoral head shortly after femoral neck fracture: a case report and literature review

This case report describes a woman in her 70s who presented with a 3-month history of hip pain and inability to walk. Upon admission, she was diagnosed with the extremely rare condition of complete femoral head disappearance. A comprehensive examination was conducted to determine the cause and devise an effective treatment strategy, taking the patient’s medical history into account. Through interdisciplinary discussions, occult infection and other potential causes were ruled out. The femoral head disappearance was ultimately determined to be due to wear, ischemia, and absorption following a fracture. After informing the patient of the diagnosis and treatment plan, total hip arthroplasty was proposed. This case highlights the rarity and severity of femoral head disappearance in patients with femoral neck fractures, emphasizing the effectiveness of total hip arthroplasty and appropriate joint prostheses in managing such cases. This case has significant implications for clinical diagnosis, treatment, and complication prevention. The report also discusses the causes of acquired femoral head disappearance, relevant diagnostic assessments, and alternative treatment options.