I might have already posted this but if not, it's useful to publicise. This paper shows low TSH has no effect on fracures of any sort, mortality, stroke or atrial fibrillation, but shows increased chance of mortality and fractures with above range TSH. The TSH has only got to get above the upper limit of its healthy range for these relationships to start to become obvious.
CCBYNC Open access
Thyroid replacement therapy, thyroid stimulating hormone concentrations, and long term health outcomes in patients with hypothyroidism: longitudinal study
BMJ 2019; 366 doi: doi.org/10.1136/bmj.l4892 (Published 03 September 2019)