=====Block vertebra=====
Block [[vertebra]] means [[fusion]] of 2 or more vertebrae. Compression fracture on block vertebra is very rare and few case reports have been published. 

Woo et al. present a case of acute compression fracture in block vertebra which was well treated with single level [[vertebroplasty]] by migration of PMMA
((Woo JY, Pee YH, An Y, Lim JH, Jang IT. A case of acute compression fracture in
block vertebra. Spine J. 2015 Oct 19. pii: S1529-9430(15)01521-1. doi:
10.1016/j.spinee.2015.10.010. [Epub ahead of print] PubMed PMID: 26494372.
)).