TY - JOUR
T1 - Bone turnover in bone biopsies of patients with low-energy cortical fractures receiving bisphosphonates
T2 - A case series
AU - Armamento-Villareal, Reina
AU - Napoli, Nicola
AU - Diemer, Kathryn
AU - Watkins, Marcus
AU - Civitelli, Roberto
AU - Teitelbaum, Steven
AU - Novack, Deborah
N1 - Funding Information:
This work was supported in part by National Institutes of Health grant K12 HD01459 (Building Interdisciplinary Research Careers in Women’s Health, to R. A.-V.). These results were presented at the 29th annual meeting of the American Society for Bone and Mineral Research, Honolulu, HI, September 16–19, 2007.
PY - 2009/7
Y1 - 2009/7
N2 - Recent reports of long-term bisphosphonate-treated patients developing cortical fractures have raised concerns that such fractures may relate to excessive suppression of bone turnover after prolonged use of these drugs. To evaluate the bone histology of patients presenting with cortical fractures after bisphosphonate therapy, we conducted a retrospective analysis of patients treated at Washington University Bone Health Program presenting with a history of low-energy cortical fractures (femoral shaft, pelvis, rib, metatarsal, and ankle), who had received bisphosphonates for at least two consecutive years and had undergone bone biopsy. Fifteen of 54 patients who underwent bone biopsy between November 2004 and March 2007 met the criteria. Of these, 10 patients had findings of suppressed trabecular bone remodeling, as demonstrated by lack of double tetracycline labels. There were no significant differences in bone density, clinical features, and biochemical features between those with suppressed turnover and the other five subjects with normal remodeling. However, the low-turnover group had received bisphosphonates (primarily alendronate) for a significantly longer duration (6.5 ± 0.6 vs. 3.9 ± 0.8 years, P = 0.02). Thus, about two-thirds of patients presenting with cortical fractures while on long-term treatment with bisphosphonates had suppressed turnover. Since the prevalence of such histological findings in nonfracture patients remains unknown, the impact of suppressed bone turnover on the development of cortical fractures cannot be determined. Considering the widespread use of bisphosphonates, it appears that the overall risk of cortical fractures is low. However, there may be a subset of as yet unidentified patients who could be predisposed to this complication.
AB - Recent reports of long-term bisphosphonate-treated patients developing cortical fractures have raised concerns that such fractures may relate to excessive suppression of bone turnover after prolonged use of these drugs. To evaluate the bone histology of patients presenting with cortical fractures after bisphosphonate therapy, we conducted a retrospective analysis of patients treated at Washington University Bone Health Program presenting with a history of low-energy cortical fractures (femoral shaft, pelvis, rib, metatarsal, and ankle), who had received bisphosphonates for at least two consecutive years and had undergone bone biopsy. Fifteen of 54 patients who underwent bone biopsy between November 2004 and March 2007 met the criteria. Of these, 10 patients had findings of suppressed trabecular bone remodeling, as demonstrated by lack of double tetracycline labels. There were no significant differences in bone density, clinical features, and biochemical features between those with suppressed turnover and the other five subjects with normal remodeling. However, the low-turnover group had received bisphosphonates (primarily alendronate) for a significantly longer duration (6.5 ± 0.6 vs. 3.9 ± 0.8 years, P = 0.02). Thus, about two-thirds of patients presenting with cortical fractures while on long-term treatment with bisphosphonates had suppressed turnover. Since the prevalence of such histological findings in nonfracture patients remains unknown, the impact of suppressed bone turnover on the development of cortical fractures cannot be determined. Considering the widespread use of bisphosphonates, it appears that the overall risk of cortical fractures is low. However, there may be a subset of as yet unidentified patients who could be predisposed to this complication.
KW - Bisphosphonate
KW - Bone turnover
KW - Fracture
KW - Osteoporosis
UR - http://www.scopus.com/inward/record.url?scp=67651233516&partnerID=8YFLogxK
U2 - 10.1007/s00223-009-9263-5
DO - 10.1007/s00223-009-9263-5
M3 - Article
C2 - 19548019
AN - SCOPUS:67651233516
SN - 0171-967X
VL - 85
SP - 37
EP - 44
JO - Calcified Tissue International
JF - Calcified Tissue International
IS - 1
ER -