Restoration and preservation of disc height and segmental lordosis with circumferential lumbar fusion: a retrospective analysis of cage versus bone graft.

Study Design: Retrospective radiographic analysis.

Objective: To determine whether restoration and preservation of (a) disc height and (b) segmental lordosis differ between patients treated with circumferential lumbar fusion using a bone graft or a cage for anterior support.

Summary Of Background Data: Restoration of disc height and lordosis is considered to be of crucial importance in circumferential fusion (CF).