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Lumbar vertebral bone density is decreased in horses with pituitary pars intermedia dysfunction. | LitMetric

AI Article Synopsis

Article Abstract

Background: Pathological fractures have been reported in equids with pituitary pars intermedia dysfunction (PPID) but their prevalence and pathogenesis is unknown.

Objectives: To compare: (1) bone mineral density (BMD) in weight bearing and nonweight bearing bones in PPID equids and aged and young PPID controls; and (2) biomechanical properties of the fourth lumbar vertebral body in PPID equids and aged PPID equids.

Study Design: Case-control study: five PPID equids and six aged and four young PPID control horses.

Methods: PPID status was based on clinical signs and necropsy examination of the pituitary gland (PG). The lumbar vertebral column, right front third metacarpus (MC3), left hind third metatarsus (MT3), and PG were removed after euthanasia. BMD was determined by quantitative computed tomography of regions of interest (ROI) in each bone and biomechanical testing was performed on the fourth lumbar vertebral body. Serum concentrations of parathormone (PTH), ionised Ca , 25-hydroxyvitamin D, and osteocalcin (OC) were also measured. Data were analysed using one-way ANOVA and correlation analyses.

Results: BMD of trabecular and cortical regions of interest (ROI) of the third, fourth (L4), and fifth lumbar vertebrae were significantly lower in PPID equids as compared with aged (p < 0. 001) and young (p < 0.01) PPID controls. In contrast, no differences were found in BMD of trabecular or cortical ROIs of MC3 and MT3 between groups. No differences were detected in force at fracture, displacement at fracture, Young's modulus or strain of L4 between PPID and aged PPID horses. No differences were found in serum PTH, ionised Ca , 25-hydroxyvitamin D, or OC concentrations between groups.

Main Limitations: Limited number of equids studied and variation in test results.

Conclusions: BMD of nonweight bearing bones can be decreased with PPID and could increase risk of developing pathological fractures.

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Source
http://dx.doi.org/10.1111/evj.14039DOI Listing

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