Bilateral atypical femoral fractures during denosumab therapy in a patient with adult-onset hypophosphatasia
Journal article
Warren, Annabelle M., Ebeling, Peter R., Grill, Vivian, Seeman, Ego and Sztal-Mazer, Shoshana. (2021). Bilateral atypical femoral fractures during denosumab therapy in a patient with adult-onset hypophosphatasia. Endocrinology, Diabetes & Metabolism. 2021(1), pp. 1-5. https://doi.org/10.1530/EDM-21-0096
Authors | Warren, Annabelle M., Ebeling, Peter R., Grill, Vivian, Seeman, Ego and Sztal-Mazer, Shoshana |
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Abstract | Hypophosphatasia (HPP) is a rare and under-recognised genetic defect in bone mineralisation. Patients presenting with fragility fractures may be mistakenly diagnosed as having osteoporosis and prescribed antiresorptive therapy, a treatment which may increase fracture risk. Adult-onset HPPhypophosphatasia was identified in a 40-year-old woman who presented with bilateral atypical femoral fractures after 4 years of denosumab therapy. A low serum alkaline phosphatase (ALP) and increased serum vitamin B6 level signalled the diagnosis, which was later confirmed by identification of two recessive mutations of the ALPL gene. The patient was treated with teriparatide given the unavailability of ALP enzyme-replacement therapy (asfotase alfa). Fracture healing occurred, but impaired mobility persisted. HPP predisposes to atypical femoral fracture (AFF) during antiresorptive therapy; hence, bisphosphonates and denosumab are contraindicated in this condition. Screening patients with fracture or ‘osteoporosis’ to identify a low ALP level is recommended. |
Keywords | hypophosphatasia; fractures; bone fractures |
Year | 2021 |
Journal | Endocrinology, Diabetes & Metabolism |
Journal citation | 2021 (1), pp. 1-5 |
Publisher | BioScientifica Ltd. |
ISSN | 2398-9238 |
Digital Object Identifier (DOI) | https://doi.org/10.1530/EDM-21-0096 |
PubMed ID | 34515659 |
Scopus EID | 2-s2.0-85121031842 |
PubMed Central ID | PMC8495717 |
Open access | Published as ‘gold’ (paid) open access |
Research or scholarly | Research |
Page range | 1-5 |
Publisher's version | License File Access Level Open |
Output status | Published |
Publication dates | |
Online | 13 Sep 2021 |
Publication process dates | |
Accepted | 19 Aug 2021 |
Deposited | 29 Mar 2022 |
https://acuresearchbank.acu.edu.au/item/8x9y1/bilateral-atypical-femoral-fractures-during-denosumab-therapy-in-a-patient-with-adult-onset-hypophosphatasia
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Publisher's version
OA_Warren_2021_Bilateral_atypical_femoral_fractures_during_denosumab.pdf | |
License: CC BY-NC-ND | |
File access level: Open |
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