Mối tương quan giữa hình ảnh chụp cộng hưởng từ có nén ép theo trục với triệu chứng lâm sàng trong bệnh lý hẹp ống sống thắt lưng do thoái hoá

Abstract

Objective: To examine whether the dural cross-section area (DCSA) and anteroposterior diameter (APD) in axial loaded magnetic resonance imaging (MRI) correlates with the severity of clinical symptoms in patients with lumbar spinal canal stenosis (LSCS). Subject and method: From March 2015 to September 2016 the research was performed on 62 patients with LSCS, DCSA and APD in conventional MRI, axial loaded MRI, and changes in the DCSA and APD were determined at the single most constricted intervertebral level. The severity of symptoms was evaluated on the basis of the walking distance, visual analogue scale (VAS) of leg pain, back pain, Japanese Orthopaedic Association score and ODI (Oswestry Disability Index 2.0). Spearman correlations of the DCSA and APD in conventional MRI, axial loaded MRI, and changes in the DCSA and APD with the severity of symptoms were analyzed. Result: 62 patients with LSCS (25 men and 37 women, 32 - 81 years, median age, 57.61 ± 9.6 years), VAS back pain: 6.0 ± 1.03, VAS leg pain: 6.64 ± 1.32, ODI: 69.23 ± 5.52. JOA: 10.03 ± 1.35, walking distance: 0.48 ± 0.47. The changes in the DCSA and APD were determined at the single most constricted intervertebral level APD: 0.72 ± 1.02mm; DCSA: 13.72 ± 1.42mm². We found there was correlation clearly between the DCSA and APD in axial loaded MRI with the severity of symptoms (VAS back pain, VAS leg pain, JOA and walking distance). Conclusion: The change of DCSA and APD at the single most constricted intervertebral level was significantly different between conventional MRI and axial loaded MRI. Moreover, there was correlation clearly between the DCSA and APD in axial loaded MRI with the severity of symptoms.