On contrary, I see
bone density get thicker on thyroid medication. You asked for an article, here is one the best ones:
Lancet. 1992 Jul 4;340(8810):9-13.
Long-term thyroxine treatment and bone mineral density.
Franklyn JA1, Betteridge J, Daykin J, Holder R, Oates GD, Parle JV, Lilley J, Heath DA, Sheppard MC.