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J Am Soc Nephrol. 2014 Jun;25(6):1331-41. doi: 10.1681/ASN.2013080851. Epub 2014 Feb 7.

Kidney transplantation with early corticosteroid withdrawal: paradoxical effects at the central and peripheral skeleton.

Author information

1
Department of Medicine, Kaiser Permanente Medical Center, Oakland, California;
2
Department of Orthopedics and Rehabilitation, University of Rochester Medical Center, Rochester, New York;
3
Department of Medicine and.
4
Institut National de la Santé et de la Recherche Médicale U1033, University of Lyon, Lyon, France;
5
McKay Orthopaedic Research Laboratory, Department of Orthopedic Surgery, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania; and.
6
Department of Surgery, Columbia University Medical Center, New York, New York;
7
School of Engineering, Department of Biomedical Engineering, Columbia University, New York, New York.
8
Department of Medicine and tln2001@columbia.edu.

Abstract

The use of early corticosteroid withdrawal (ECSW) protocols after kidney transplantation has become common, but the effects on fracture risk and bone quality are unclear. We enrolled 47 first-time adult transplant recipients managed with ECSW into a 1-year study to evaluate changes in bone mass, microarchitecture, biomechanical competence, and remodeling with dual energy x-ray absorptiometry (DXA), high-resolution peripheral quantitative computed tomography (HRpQCT), parathyroid hormone (PTH) levels, and bone turnover markers obtained at baseline and 3, 6, and 12 months post-transplantation. Compared with baseline, 12-month areal bone mineral density by DXA did not change significantly at the spine and hip, but it declined significantly at the 1/3 and ultradistal radii (2.2% and 2.9%, respectively; both P<0.001). HRpQCT of the distal radius revealed declines in cortical area, density, and thickness (3.9%, 2.1%, and 3.1%, respectively; all P<0.001), trabecular density (4.4%; P<0.001), and stiffness and failure load (3.1% and 3.5%, respectively; both P<0.05). Findings were similar at the tibia. Increasing severity of hyperparathyroidism was associated with increased cortical losses. However, loss of trabecular bone and bone strength were most severe at the lowest and highest PTH levels. In summary, ECSW was associated with preservation of bone mineral density at the central skeleton; however, it was also associated with progressive declines in cortical and trabecular bone density at the peripheral skeleton. Cortical decreases related directly to PTH levels, whereas the relationship between PTH and trabecular bone decreases was bimodal. Studies are needed to determine whether pharmacologic agents that suppress PTH will prevent cortical and trabecular losses and post-transplant fractures.

PMID:
24511131
PMCID:
PMC4033378
DOI:
10.1681/ASN.2013080851
[Indexed for MEDLINE]
Free PMC Article

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