Journal of Bone and Mineral Metabolism

, Volume 29, Issue 2, pp 236–244 | Cite as

Bone metabolism and the muscle–bone relationship in children, adolescents and young adults with phenylketonuria

  • Piotr AdamczykEmail author
  • Aurelia Morawiec-Knysak
  • Paweł Płudowski
  • Beata Banaszak
  • Jacek Karpe
  • Wojciech Pluskiewicz
Original Article


The aim of the study was to assess body composition in subjects with phenylketonuria (PKU). Forty-five patients aged 13.8 ± 5.2 years were evaluated. Among them, 15 patients had not reached sexual maturity, showing normal serum values of phenylalanine (Phe) (subgroup 1), and 30 subjects were sexually mature (Tanner 5 stage), showing either normal serum Phe (18 cases; subgroup 2a) or increased serum Phe (12 cases; subgroup 2b). DXA-assessed spine and total body (TB) measurements [bone mineral density (BMD), bone mineral content (BMC), lean body mass (LBM) and the calculated ratios BMC/LBM] as well as laboratory parameters (serum carboxyterminal telopeptide of type I collagen, bone alkaline phosphatase, osteocalcin, parathormone, calcitonin, total and ionized calcium) were analyzed. Statistically significant differences were revealed between subgroup 1 versus 2a for TB BMC/LBM ratio SD scores and between subgroup 2a versus 2b for TB BMD, spine BMD, TB BMC/LBM ratio and spine BMC/LBM ratio SD scores. Stepwise multiple regression analysis revealed that serum Phe negatively affected bone status. The skeletal status in children with PKU is impaired by the disease. Applying body composition parameters instead of BMD alone may reflect the level of impairment in a new, different way.


Phenylketonuria Bone mineral density Laboratory investigations Muscles Children 


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Copyright information

© The Japanese Society for Bone and Mineral Research and Springer 2010

Authors and Affiliations

  • Piotr Adamczyk
    • 1
    Email author
  • Aurelia Morawiec-Knysak
    • 1
  • Paweł Płudowski
    • 2
  • Beata Banaszak
    • 1
  • Jacek Karpe
    • 3
  • Wojciech Pluskiewicz
    • 4
  1. 1.Department and Clinic of Pediatrics in ZabrzeMedical University of SilesiaZabrzePoland
  2. 2.Department of Biochemistry and Experimental MedicineThe Children’s Memorial Health InstituteWarsawPoland
  3. 3.Department of Anesthesiology and Intensive Care in ZabrzeMedical University of SilesiaKatowicePoland
  4. 4.Metabolic Bone Diseases Unit in Zabrze, Department and Clinic of Internal Diseases, Diabetology and NephrologyMedical University of SilesiaKatowicePoland

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