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  • Title: Trabecular bone score and bone mineral density as indices of skeletal fragility in endogenous Cushing's syndrome.
    Author: Boro H, Mannar V, Malhotra R, Alam S, Khatiwada S, Kubihal S, Dogra V, Golla KK, Mathew UE, Halebidu T, Attri B.
    Journal: Clin Endocrinol (Oxf); 2023 Sep; 99(3):253-261. PubMed ID: 37401517.
    Abstract:
    OBJECTIVE: Endogenous Cushing's syndrome (CS) is a known cause of secondary osteoporosis. Vertebral fractures (VFs) in endogenous CS may occur despite normal bone mineral density (BMD). Trabecular bone score (TBS) is a relatively new, non-invasive technique to assess bone microarchitecture. The objective of our study was to analyse the BMD and bone microarchitecture using TBS in endogenous CS and compare it with a group of age and sex-matched healthy controls, and also analyse the factors predicting BMD and TBS. DESIGN: Cross-sectional study of cases and controls. PATIENTS AND MEASUREMENTS: We included 40 female patients with overt endogenous CS, out of which 32 were adrenocorticotropic hormone (ACTH)-dependent CS and 8 were ACTH-independent. We also included 40 healthy, female controls. Both patients and controls were subjected to an assessment of biochemical parameters and BMD and TBS. RESULTS: Patients with endogenous CS had significantly lower BMD at the lumbar spine, femoral neck, and total hip and significantly lower TBS than healthy controls (all p < .001), while no significant difference was noted in the distal radius BMD (p = .055). In endogenous CS, a large proportion of patients, n = 13 (32.5%) had normal BMD for age (BMD Z-score ≥ -2.0) with low TBS (L1 -L4 TBS ≤ 1.34). TBS correlated negatively with HbA1c (p = .006), and positively with serum T4 (p = .027). CONCLUSION: TBS should be considered an important complementary tool in addition to BMD for the routine assessment of skeletal health in CS.
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