Taylor 2015: Figure 8. Cervical vertebrae 4 (left) and 6 (right) of Giraffatitan brancai lectotype MB.R.2180 (previously HMN SI), in posterior view. Note the dramatically different aspect ratios of their cotyles, indicating that extensive and unpredictable crushing has taken place. Photographs by author. Here are cervicals 4 and 8 from MB.R.2180, the big mounted Giraffatitan in Berlin.
Matt Wedel (Fri,) studied this question.