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Related Experiment Videos

Immobilization and hypercalciuria in children.

Fernando Korkes1, André B Segal, Ita P Heilberg

  • 1Department of Urology, Medical Sciences School of Santa Casa of São Paulo, São Paulo, Brazil. fkorkes@terra.com.br

Pediatric Nephrology (Berlin, Germany)
|July 5, 2006
PubMed
Summary

Immobilization for Legg-Calvé-Perthes disease (LCP) can transiently increase urinary calcium in 40% of children. However, this immobilization does not increase the risk of urinary stone formation in LCP or developmental dysplasia of the hip joint patients.

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Area of Science:

  • Pediatric Orthopedics
  • Metabolic Bone Disease
  • Calcium Metabolism

Background:

  • Immobilization is a common treatment for pediatric orthopedic conditions.
  • Potential effects of intermediate-term immobilization on calcium metabolism are not well-established in pediatric populations.
  • Legg-Calvé-Perthes disease (LCP) and developmental dysplasia of the hip joint (DDH) require immobilization, presenting an opportunity to study calcium metabolism.

Purpose of the Study:

  • To investigate the hypothesis that intermediate-term immobilization increases serum and urinary calcium levels in children.
  • To evaluate changes in calcium metabolism markers during immobilization for LCP and DDH.
  • To assess the risk of urinary stone formation associated with immobilization in these pediatric groups.

Main Methods:

Related Experiment Videos

  • A cohort of 46 children (21 with LCP, 25 with DDH) undergoing immobilization up to 16 weeks was studied.
  • Blood and urine samples were collected at various time points during immobilization for analysis of calcium, creatinine, and other relevant markers.
  • Renal ultrasound was performed before and after treatment to detect urinary stones.

Main Results:

  • A significant increase in urinary calcium (2.3 times baseline) was observed in 40% of LCP patients after 1 week of immobilization.
  • No significant changes in urinary calcium excretion were noted in DDH patients.
  • Serum calcium, phosphorus, parathyroid hormone, creatinine, and alkaline phosphatase levels remained unchanged in both groups; no urinary stones were detected.

Conclusions:

  • Intermediate-term immobilization can lead to a transient increase in urinary calcium in a subset of LCP patients.
  • This immobilization treatment modality does not appear to increase the risk of urinary stone formation in children with LCP or DDH.
  • Further research into the mechanisms of calcium dysregulation during immobilization may be warranted.