EFFECT OF OBLIQUE LATERAL INTERBODY FUSION AND PERCUTANEOUS PEDICLE SCREW POSTERIOR FIXATION SCHEME ON FIXATION OUTCOMES AND IMAGING PARAMETERS IN PATIENTS WITH DEGENERATIVE LUMBAR SPONDYLOLISTHESIS

Rong Wu^{1, #}, Jianwei Sun^{2, #}, Zheyuan Shen¹, Xiaojie Dou¹, Haidong Li¹, Jikang Min¹, Yunlong Shen^{1, *}

¹Department of Orthopaedics, The First People’s Hospital of Huzhou(The First Affiliated Hospital of Huzhou University), Huzhou, Zhejiang, 313000, PR China - ²Department of Rehabilitation Medicine, The First People’s Hospital of Huzhou (The First Affiliated Hospital of Huzhou University), Huzhou, Zhejiang, 313000, PR China

Objective: To investigate the effect of oblique lateral interbody fusion (OLIF) and percutaneous pedicle screw (PPS) posterior fixation scheme on fixation outcomes and imaging parameters of surgical segments in patients with degenerative lumbar spondylolisthesis (DS). 

Methods: Eighty patients with DS treated with the OLIF and PPS posterior fixation scheme at our hospital from January 2018 to January 2021 were retrospectively included, and divided into direct (44 patients) and indirect (36 patients) groups according to the decompression method, to analyze general data, slip rate, intervertebral space height and segmental lordosis angle, and to evaluate the effect of decompression method on the patients' surgical segmental imaging parameters. 

Results: The intervertebral space height was significantly higher after fusion cage insertion than before (P<0.05); the intervertebral space height was significantly higher after fixation than before fusion cage insertion (P<0.05). Slip rate after fusion cage insertion was significantly lower than before (P<0.05); slip rate after fixation was significantly lower than before and after fusion cage insertion (P<0.05); segmental lordosis angle after fixation was significantly higher than before and after fusion cage insertion (P<0.05); Age was significantly higher in the direct group than in the indirect group (P<0.05); there was no statistically significant difference between the two groups in terms of gender, segmental distribution, intervertebral space height, slip rate and segmental lordosis angle (P>0.05). 

Conclusion: Treatment of DS patients with OLIF and PPS posterior fixation scheme can ef-fectively reduce the slip rate and improve the operative segmental lordosis, and the effect of direct in-traoperative decompression on the lumbar segmental force lines was mild.