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Preservation of volumetric bone density and geometry in trans women during cross-sex hormonal therapy: a prospective observational study

Eva Van Caenegem (UGent) , Katrien Wierckx, Youri Taes (UGent) , Thomas Schreiner (UGent) , SARA VANDEWALLE (UGent) , Kaatje Toye (UGent) , Jean Kaufman (UGent) and Guy T'Sjoen (UGent)
(2015) OSTEOPOROSIS INTERNATIONAL. 26(1). p.35-47
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Abstract
Although trans women before the start of hormonal therapy have a less bone and muscle mass compared with control men, their bone mass and geometry are preserved during the first 2 years of hormonal therapy, despite of substantial muscle loss, illustrating the major role of estrogen in the male skeleton. The aim of this study is to examine the evolution of areal and volumetric bone density, geometry, and turnover in trans women undergoing sex steroid changes, during the first 2 years of hormonal therapy. In a prospective observational study, we examined 49 trans women (male-to-female) before and after 1 and 2 years of cross-sex hormonal therapy (CSH) in comparison with 49 age-matched control men measuring grip strength (hand dynamometer), areal bone mineral density (aBMD), and total body fat and lean mass using dual X-ray absorptiometry (DXA), bone geometry and volumetric bone mineral density, regional fat, and muscle area at the forearm and calf using peripheral quantitative computed tomography. Standardized treatment regimens were used with oral estradiol valerate, 4 mg daily (or transdermal 17-beta estradiol 100 mu g/24 h for patients > 45 years old), both combined with oral cyproterone acetate 50 mg daily. Prior to CSH, trans women had lower aBMD at all measured sites (all p < 0.001), smaller cortical bone size (all p < 0.05), and lower muscle mass and strength and lean body mass (all p < 0.05) compared with control men. During CSH, muscle mass and strength decreased and all measures of fat mass increased (all p < 0.001). The aBMD increased at the femoral neck, radius, lumbar spine, and total body; cortical and trabecular bone remained stable and bone turnover markers decreased (all p < 0.05). Although trans women, before CSH, have a lower aBMD and cortical bone size compared with control men, their skeletal status is well preserved during CSH treatment, despite of substantial muscle loss.
Keywords
TO-FEMALE TRANSSEXUALS, Bone transsexual gender dyspohria sex steroids prospective, TERM-FOLLOW-UP, MINERAL DENSITY, PHYSICAL-ACTIVITY, BODY-COMPOSITION, PROSTATE-CANCER, FRACTURE RISK, TURNOVER RATE, VITAMIN-D, MASS

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Chicago
Van Caenegem, Eva, Katrien Wierckx, Youri Taes, Thomas Schreiner, Sara Vandewalle, Kaatje Toye, Jean Kaufman, and Guy T’Sjoen. 2015. “Preservation of Volumetric Bone Density and Geometry in Trans Women During Cross-sex Hormonal Therapy: a Prospective Observational Study.” Osteoporosis International 26 (1): 35–47.
APA
Van Caenegem, E., Wierckx, K., Taes, Y., Schreiner, T., Vandewalle, S., Toye, K., Kaufman, J., et al. (2015). Preservation of volumetric bone density and geometry in trans women during cross-sex hormonal therapy: a prospective observational study. OSTEOPOROSIS INTERNATIONAL, 26(1), 35–47.
Vancouver
1.
Van Caenegem E, Wierckx K, Taes Y, Schreiner T, Vandewalle S, Toye K, et al. Preservation of volumetric bone density and geometry in trans women during cross-sex hormonal therapy: a prospective observational study. OSTEOPOROSIS INTERNATIONAL. 2015;26(1):35–47.
MLA
Van Caenegem, Eva, Katrien Wierckx, Youri Taes, et al. “Preservation of Volumetric Bone Density and Geometry in Trans Women During Cross-sex Hormonal Therapy: a Prospective Observational Study.” OSTEOPOROSIS INTERNATIONAL 26.1 (2015): 35–47. Print.
@article{6850583,
  abstract     = {Although trans women before the start of hormonal therapy have a less bone and muscle mass compared with control men, their bone mass and geometry are preserved during the first 2 years of hormonal therapy, despite of substantial muscle loss, illustrating the major role of estrogen in the male skeleton. 
The aim of this study is to examine the evolution of areal and volumetric bone density, geometry, and turnover in trans women undergoing sex steroid changes, during the first 2 years of hormonal therapy. 
In a prospective observational study, we examined 49 trans women (male-to-female) before and after 1 and 2 years of cross-sex hormonal therapy (CSH) in comparison with 49 age-matched control men measuring grip strength (hand dynamometer), areal bone mineral density (aBMD), and total body fat and lean mass using dual X-ray absorptiometry (DXA), bone geometry and volumetric bone mineral density, regional fat, and muscle area at the forearm and calf using peripheral quantitative computed tomography. Standardized treatment regimens were used with oral estradiol valerate, 4 mg daily (or transdermal 17-beta estradiol 100 mu g/24 h for patients {\textrangle} 45 years old), both combined with oral cyproterone acetate 50 mg daily. 
Prior to CSH, trans women had lower aBMD at all measured sites (all p {\textlangle} 0.001), smaller cortical bone size (all p {\textlangle} 0.05), and lower muscle mass and strength and lean body mass (all p {\textlangle} 0.05) compared with control men. During CSH, muscle mass and strength decreased and all measures of fat mass increased (all p {\textlangle} 0.001). The aBMD increased at the femoral neck, radius, lumbar spine, and total body; cortical and trabecular bone remained stable and bone turnover markers decreased (all p {\textlangle} 0.05). 
Although trans women, before CSH, have a lower aBMD and cortical bone size compared with control men, their skeletal status is well preserved during CSH treatment, despite of substantial muscle loss.},
  author       = {Van Caenegem, Eva and Wierckx, Katrien and Taes, Youri and Schreiner, Thomas and VANDEWALLE, SARA and Toye, Kaatje and Kaufman, Jean and T'Sjoen, Guy},
  issn         = {0937-941X},
  journal      = {OSTEOPOROSIS INTERNATIONAL},
  keyword      = {TO-FEMALE TRANSSEXUALS,Bone transsexual gender dyspohria sex steroids prospective,TERM-FOLLOW-UP,MINERAL DENSITY,PHYSICAL-ACTIVITY,BODY-COMPOSITION,PROSTATE-CANCER,FRACTURE RISK,TURNOVER RATE,VITAMIN-D,MASS},
  language     = {eng},
  number       = {1},
  pages        = {35--47},
  title        = {Preservation of volumetric bone density and geometry in trans women during cross-sex hormonal therapy: a prospective observational study},
  url          = {http://dx.doi.org/10.1007/s00198-014-2805-3},
  volume       = {26},
  year         = {2015},
}

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