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doi: https://doi.org/10.4132/jptm.2020.05.14    [Epub ahead of print]
Atypical femoral neck fracture after prolonged bisphosphonate therapy
Kwang-kyoun Kim1 , Young-wook Park2 , Tae-hyeong Kim1 , Kyung-deok Seo1
1Department of Orthopaedic Surgery, Konyang Unversity Hospital, Daejeon, Korea
2Department of Pathology, Konyang Unversity Hospital, Daejeon, Korea
Corresponding Author: Kwang-kyoun Kim ,Tel: +82-42-600-6902, Fax: +82-42-600-9964, Email: kimajouos@gmail.com
Received: April 7, 2020;  Revised: May 4, 2020  Accepted: May 14, 2020.  Published online: June 29, 2020.
ABSTRACT
Of the drugs developed to prevent and treat osteoporosis, bisphosphonate has played a very important role in preventing osteoporotic fractures. However, case reports describing atypical femoral fractures in patients using long-term bisphosphonates have emerged. The majority of atypical femur fractures occurs in the lateral aspect of the subtrochanteric or femur diaphysis, which is explained by accumulation of tensile stress in these areas. Although the superior cortex of the femur neck withstands maximum tensile stress, to our knowledge, there have been only two reports (three cases) of atypical femoral neck fracture. In addition, none of those case reports revealed detailed pathology related to suppressed bone turnover rate. We encountered an incomplete femoral neck fracture and diagnosed it as “atypical” on the basis of the patient’s lack of trauma and medication history and pathological findings. For patients with groin pain, minimal or no trauma, and a history of long-term bisphosphonate use, an atypical femoral neck fracture should be considered.
Key Words: Atypical femur fracture; Femur neck fracture; Tensile strength; Bisphosphonate
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