The Keeper wrote:
^Some of them do in STO #25 The Khitomer Conflict. Looking through that again, however, I cannot find the same frame I was recalling before although the bottom frame of page one is similar. I may have dream't it, or my memory was mistaken, (brainfart.) I'll let you know if I come across it again.
I hate the head ridge rings. But in any case, it was a definite error that the Klingons in The Khitomer Conflict
had smooth backs as seen in this image from IDW #25.
Because here is Worf's back as seen in TNG: "Ethics".