Fig. 3From: The impact of different artificial disc heights during total cervical disc replacement: an in vitro biomechanical studyThe lateral radiographs of a specimen with the intact condition a, 5-mm implant b, 6-mm implant c, and 7-mm implant d. The facet joints at C5–6 were gradually stretched with the increment of implant height, and the articular surfaces were not parallel with a 7-mm-high artificial disc inserted dBack to article page