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Renal osteodystrophy

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Renal osteodystrophy
SpecialtyNephrology, orthopedic surgery Edit this on Wikidata

Renal osteodystrophy is currently defined as an alteration of bone morphology in patients with chronic kidney disease (CKD).[1] It is one measure of the skeletal component of the systemic disorder of chronic kidney disease-mineral and bone disorder (CKD-MBD).[1][2][3] The term "renal osteodystrophy" was coined in 1943,[4] 60 years after an association was identified between bone disease and renal failure.[5] The traditional types of renal osteodystrophy[6] have been defined on the basis of turnover and mineralization as follows: mild, slight increase in turnover and normal mineralization; osteitis fibrosa, increased turnover and normal mineralization; osteomalacia, decreased turnover and abnormal mineralization; adynamic, decreased turnover and acellularity; mixed, increased turnover with abnormal mineralization.[1] A Kidney Disease: Improving Global Outcomes report has suggested that bone biopsies in patients with CKD should be characterized by determining bone turnover, mineralization, and volume (TMV system).[2] On the other hand, CKD-MBD is defined as a systemic disorder of mineral and bone metabolism due to CKD manifested by either one or a combination of the following: 1) abnormalities of calcium, phosphorus, PTH, or vitamin D metabolism; 2) abnormalities in bone turnover, mineralization, volume, linear growth, or strength (renal osteodystrophy); and 3) vascular or other soft-tissue calcification.[1][7]

Signs and symptoms

Renal osteodystrophy may exhibit no symptoms; if it does show symptoms, they include:

  • Bone pain
  • Joint pain
  • Bone deformation
  • Bone fracture
  • The broader concept of chronic kidney disease-mineral and bone disorder (CKD-MBD)[1] is not only associated with fractures but also with cardiovascular calcification, poor quality of life and increased morbidity and mortality in CKD patients (the so-called bone-vascular axis).[8] These clinical consequences are acquiring such an importance that scientific working groups (such as the ERA-EDTA CKD-MBD Working Group[9]) or international initiatives[10] are trying to promote research in the field including basic, translational and clinical research.

Diagnosis

Renal osteodystrophy is usually diagnosed after treatment for end-stage kidney disease begins; however the CKD-MBD starts early in the course of CKD.[1][6] In advanced stages, blood tests will indicate decreased calcium and calcitriol (vitamin D) and increased phosphate, and parathyroid hormone levels. In earlier stages, serum calcium, phosphate levels are normal at the expense of high parathyroid hormone and fibroblast growth factor-23 levels. X-rays will also show bone features of renal osteodystrophy (subperiostic bone resorption, chondrocalcinosis at the knees and pubic symphysis, osteopenia and bone fractures) but may be difficult to differentiate from other conditions. Since the diagnosis of these bone abnormalities cannot be obtained correctly by current clinical, biochemical, and imaging methods (including measurement of bone-mineral density), bone biopsy has been, and still remains, the gold standard analysis for assessing the exact type of renal osteodystrophy.[6][11]

Pathogenesis

Renal osteodystrophy has been classically described to be the result of hyperparathyroidism secondary to hyperphosphatemia combined with hypocalcaemia, both of which are due to decreased excretion of phosphate by the damaged kidney. Low activated vitamin D3 levels are a result of the damaged kidneys' inability to convert vitamin D3 into its active form, calcitriol, and result in further hypocalcaemia. High levels of fibroblast growth factor 23 seem now to be the most important cause of decreased calcitriol levels in CKD patients. In CKD the excessive production of parathyroid hormone increases the bone resorption rate and leads to histologic bone signs of secondary hyperparathyroidism.[11] However, in other situations, the initial increase in parathyroid hormone and bone remodeling may be slowed down excessively by a multitude of factors including age, ethnic origin, sex, and treatments such as vitamin D, calcium salts, calcimimetics, steroids, and so forth, leading to low bone turnover or adynamic bone disease.[11][12] Both high and low bone turnover diseases are currently observed equally in CKD patients treated by dialysis, and all types of renal osteodystrophy are associated with an increased risk of skeletal fractures, reduced quality of life, and poor clinical outcomes.[11]

Differential diagnosis

To confirm the diagnosis, renal osteodystrophy must be characterized by determining bone turnover, mineralization, and volume (TMV system)[2] (bone biopsy).[11] All forms of renal osteodystrophy should also be distinguished from other bone diseases which may equally result in decreased bone density (related or unrelated to CKD):

Treatment

Treatment for renal osteodystrophy includes the following:

Prognosis

Recovery from renal osteodystrophy has been observed following kidney transplantation. Renal osteodystrophy is a chronic condition with a conventional hemodialysis schedule.[13] Nevertheless, it is important to consider that the broader concept of CKD-MBD,[1] which includes renal osteodystrophy, is not only associated with bone disease and increased risk of fractures but also with cardiovascular calcification, poor quality of life and increased morbidity and mortality in CKD patients (the so-called bone-vascular axis).[8] Actually, bone may now be considered a new endocrine organ at the heart of CKD-MBD.[15]

References

  1. ^ a b c d e f g "KDIGO clinical practice guideline for the diagnosis, evaluation, prevention, and treatment of Chronic Kidney Disease-Mineral and Bone Disorder (CKD-MBD)" (PDF). Kidney International Supplement (113). Kidney Disease: Improving Global Outcomes (KDIGO) CKD-MBD Work Group: S1-130. August 2009. doi:10.1038/ki.2009.188. PMID 19644521.{{cite journal}}: CS1 maint: others (link)
  2. ^ a b c Moe S, Drüeke T, Cunningham J, Goodman W, Martin K, Olgaard K, Ott S, Sprague S, Lameire N, Eknoyan G (June 2006). "Definition, evaluation, and classification of renal osteodystrophy: a position statement from Kidney Disease: Improving Global Outcomes (KDIGO)". Kidney International. 69 (11): 1945–53. doi:10.1038/sj.ki.5000414. PMID 16641930.
  3. ^ "ERA-EDTA Working Group on Chronic Kidney Disease and Mineral Bone Disorder (CKD-MBD)". Retrieved 4 February 2016.
  4. ^ Lui S, Chu H (1943). "Studies in calcium and phosphorus metabolism with special reference to pathogenesis and effects of dihydrotachysterol (A.T.10) and iron". Medicine. 22: 103–107.
  5. ^ Lucas RC (1833). "Form of late rickets associated with albuminuria, rickets of adolescents". Lancet. 1: 993–994.
  6. ^ a b c Llach F, Bover J (2000). "Renal Osteodystrophies". In Brenner BM (ed.). The Kidney. Philadelphia: W.B. Saunders Company. pp. 2103–2186. ISBN 978-0-7216-7998-3. {{cite book}}: Unknown parameter |name-list-format= ignored (|name-list-style= suggested) (help)
  7. ^ Cozzolino M, Ureña-Torres P, Vervloet MG, Brandenburg V, Bover J, Goldsmith D, Larsson TE, Massy ZA, Mazzaferro S (October 2014). "Is chronic kidney disease-mineral bone disorder (CKD-MBD) really a syndrome?". Nephrology, Dialysis, Transplantation. 29 (10): 1815–20. doi:10.1093/ndt/gft514. PMID 24516228.
  8. ^ a b London GM (February 2009). "Bone-vascular axis in chronic kidney disease: a reality?". Clinical Journal of the American Society of Nephrology. 4 (2): 254–7. doi:10.2215/CJN.06661208. PMID 19176792.
  9. ^ "EraEdta Scientific Working Groups". era-edtaworkinggroups.org.
  10. ^ "Kidney Disease: Improving Global Outcomes (KDIGO)". kdigo.org.
  11. ^ a b c d e Torres PU, Bover J, Mazzaferro S, de Vernejoul MC, Cohen-Solal M (November 2014). "When, how, and why a bone biopsy should be performed in patients with chronic kidney disease". Seminars in Nephrology. 34 (6): 612–25. doi:10.1016/j.semnephrol.2014.09.004. PMID 25498380.
  12. ^ Bover J, Ureña P, Brandenburg V, Goldsmith D, Ruiz C, DaSilva I, Bosch RJ (November 2014). "Adynamic bone disease: from bone to vessels in chronic kidney disease". Seminars in Nephrology. 34 (6): 626–40. doi:10.1016/j.semnephrol.2014.09.008. PMID 25498381.
  13. ^ a b Bonomini V, Mioli V, Albertazzi A, Scolari P (November 1998). "Daily-dialysis programme: indications and results". Nephrology, Dialysis, Transplantation. 13 (11): 2774–7, discussion 2777–8. doi:10.1093/ndt/13.11.2774. PMID 9829478.
  14. ^ http://www.uptodate.com/contents/parathyroidectomy-in-end-stage-renal-disease. {{cite web}}: Missing or empty |title= (help)
  15. ^ Vervloet MG, Massy ZA, Brandenburg VM, Mazzaferro S, Cozzolino M, Ureña-Torres P, Bover J, Goldsmith D (May 2014). "Bone: a new endocrine organ at the heart of chronic kidney disease and mineral and bone disorders". The Lancet. Diabetes & Endocrinology. 2 (5): 427–36. doi:10.1016/S2213-8587(14)70059-2. PMID 24795256.
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