Bone status in cystic fibrosis

Area of Science:

• Pediatric Endocrinology
• Bone Metabolism
• Cystic Fibrosis Research

Background:

• Cystic Fibrosis (CF) is a genetic disorder affecting multiple organs, including bones.
• Bone mineral status in children with CF requires further investigation, particularly in those with milder disease phenotypes.

Purpose of the Study:

• To assess the bone mineral status in children diagnosed with cystic fibrosis.
• To compare bone parameters between CF patients and age- and sex-matched healthy controls.

Main Methods:

• Dual-energy X-ray absorptiometry (DXA) was used to measure bone mineral content (BMC), bone area (BA), and areal bone mineral density (BMD).
• Quantitative computed tomography (QCT) assessed vertebral trabecular bone mineral density (vTBMD), and quantitative ultrasound (QUS) measured calcaneal broadband ultrasound attenuation (BUA).
• Bone mineral apparent density (BMAD) was calculated to assess volumetric density, and disease severity was evaluated using the Shwachman-Kulczycki (SK) score.

Main Results:

• No significant differences were observed in BUA, whole body/regional BA, adjusted BMC, or areal BMD between CF children and controls.
• CF patients exhibited reduced lumbar spine bone mineral apparent density (BMAD) compared to controls.
• Vertebral trabecular bone mineral density (vTBMD) standard deviation scores were significantly higher in CF patients, despite a relatively mild disease severity (median SK score 81).

Conclusions:

• The findings suggest potential reductions in vertebral cortical thickness or density in CF subjects, indicated by normal vertebral BMC but decreased BMAD.
• Overall bone mineral status in children with mild CF is comparable to size-matched controls.
• These results highlight the importance of evaluating volumetric bone density measures in pediatric CF populations.