To assess a surgical technique and the postoperative outcomes of a consecutive series of 22 patients treated for degenerative lumbar spondylolisthesis (DLS) through a minimally invasive unilateral approach associating interbody fusion and percutaneous osteosynthesis.

Twenty-two patients were included in this study, with a mean age of 60 years (range, 35–77years). All had low-grade single-level DLS. In all cases, the technique included a posterior unilateral paramedial approach through a tubular retractor that decompressed the vertebral canal and transforaminal intervertebral cage arthrodesis. Osteosynthesis was then systematically put in place. The evaluation criteria were clinical (pain, spinal symptoms, duration of hospital stay) and radiological. The entire series was followed up for a mean of 24months.

In this series, the procedure was performed with no technical problems. The mean hospital stay lasted 4.5days. Postoperative pain assessment showed a mean VAS of 2/10 at discharge and 75% of the patients were asymptomatic at 6months. The radiological exams showed no extrapedicular screws and the fusion rate was 95% at the last follow-up (with one patient needing surgical revision for malunion).

Transforaminal lumbar interbody fusion through a unilateral approach associated with percutaneous osteosynthesis is a reliable and effective technique in DLS surgery. The clinical and radiological results are encouraging, with low morbidity and a fusion rate comparable to conventional techniques. However, a longer follow-up will be necessary so as to assess the long-term results of this surgical strategy.

Level IV. Retrospective study.