Transpseudarthrosis Osteotomy with Interbody Fusion for Kyphotic Spinal Pseudarthrosis in Ankylosing Spondylitis by a Single Posterior Approach: A Retrospective Study and a Brief Relevant Literature Review

Table 3

Results of different osteotomy for spinal pseudarthrosis complicating AS reported in literature and in the current study.

Author (year)	Surgical method	Clinical/radiological outcome	Blood Loss	Complications	Approach
Zhang and Zheng [13]	OWO without anterior fusion	A mean correction of 38° for local kyphosis	Not mentioned	Postoperation pneumonia in 1 patient	Posterior approach
Kim et al. [15]	SPO or PSO with anterior interbody fusion in one stage or two stages	The mean correction was 20.9° with SPO and 26.3° with PSO	Not mentioned	Dura tears in 3 patients	Combined posterior and anterior approach
Chang et al. [17]	PSO through pseudarthrosis with two-stage anterior interbody fusion in two stages	A mean correction of 36.2° for local kyphosis	A mean blood loss in PSO was 2200 ml and 470 ml in anterior fusion	None	Combined posterior and anterior approach
Qian et al. [18]	Anterior fusion and posterior internal fixation	A mean correction of 12° for local kyphosis in intervertebral space fracture patients	Not mentioned	None	Combined posterior and anterior approach
Current study	posterior reduction and transpseudarthrosis osteotomy with interbody fusion	The mean correction of 22.3° for local kyphosis	The mean blood loss was 817.5 ml	Dura tears in 1 patient and screws pullout in 1 patient	Posterior approach