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Obesity Surgery
Published in: Obesity Surgery 9/2019

01-09-2019 | Bariatric Surgery | Original Contributions

Bone Turnover Markers After Standard and Distal Roux-en-Y Gastric Bypass: Results from a Randomized Controlled Trial

Authors: Marius Svanevik, Hilde Risstad, Dag Hofsø, Ingvild K Blom-Høgestøl, Jon A. Kristinsson, Rune Sandbu, Milada Cvancarova Småstuen, Per Medbøe Thorsby, Tom Mala, Jøran Hjelmesæth

Published in: Obesity Surgery | Issue 9/2019

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Abstract

Background

Roux-en-Y gastric bypass is associated with increased risk of bone fractures. Malabsorptive procedures may be associated with secondary hyperparathyroidism and detrimental effects on bone health. We aimed to compare the effects of standard and distal gastric bypass on bone turnover markers 2 years after surgery.

Methods

Patients with body mass index (BMI) 50–60 kg/m2 (n = 113) were randomized to standard or distal gastric bypass, 105 patients (95%) completed 2-year follow-up. Serum C-terminal telopeptide of type I collagen (CTX-1), procollagen type I N-propeptide (PINP), and bone-derived alkaline phosphatase (BALP) was measured at baseline and up to 2 years after surgery. ANCOVA and linear mixed models were used to compare groups.

Results

The levels of bone turnover markers increased significantly in both groups, with no statistically significant difference between groups. Two years after standard and distal gastric bypass mean (SD) CTX-1 were 0.81 (0.32) and 0.83 (0.31) μg/L (p = 0.38), mean PINP was 77.6 (23.2) and 77.7 (29.3) μg/L (p = 0.42), and BALP 47.9 (21.9) vs. 50.7 (19.6) μg/L (p = 0.38), respectively. Multiple linear regression analyses showed that PINP and BALP correlated positively (p = 0.01 and p < 0.001) with PTH, but only BALP was significantly higher in patients with secondary hyperparathyroidism (p = 0.001). Type of surgery, vitamin D serum concentrations, and 2-year BMI were all independently associated with PTH levels.

Conclusion

A comparable increase in bone turnover markers 2 years after standard and distal gastric bypass was observed. There was a higher prevalence of secondary hyperparathyroidism after distal gastric bypass, but this did not impact bone turnover markers.

Trial Registration

Clinical Trials.​gov number NCT00821197.
Appendix
Available only for authorised users
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Metadata
Title
Bone Turnover Markers After Standard and Distal Roux-en-Y Gastric Bypass: Results from a Randomized Controlled Trial
Authors
Marius Svanevik
Hilde Risstad
Dag Hofsø
Ingvild K Blom-Høgestøl
Jon A. Kristinsson
Rune Sandbu
Milada Cvancarova Småstuen
Per Medbøe Thorsby
Tom Mala
Jøran Hjelmesæth
Publication date
01-09-2019
Publisher
Springer US
Published in
Obesity Surgery / Issue 9/2019
Print ISSN: 0960-8923
Electronic ISSN: 1708-0428
DOI
https://doi.org/10.1007/s11695-019-03909-1

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