Fig. 1From: Biomechanical changes of degenerated adjacent segment and intact lumbar spine after lumbosacral topping-off surgery: a three-dimensional finite element analysisThe process of establishing the internal implants models-from Constructing a geometric models of cage (a) and coflex (b) to finite element grid division (c and d), and to implants’ comnination (e) from Topping off modelBack to article page